Equipment catalog

Spark Logic archive eBay digital voltmeter modification RogerClark Fri Jan 15, 2016 10:43 am Hi Guys I bought a voltmeter on eBay the other day thinking it…

Archived excerpt TEK 4010/4014 Vector Graphics terminal DEMO Pito Fri Jul 14, 2017 6:43 pm The old style vector graphics terminals are still in use, at least he…

Spark Logic archive MPR121 i2c touch keypad with Wire library szilvasyz Sun Aug 13, 2017 11:08 am Hi All, (I am a new member here, so excuse me…

…ly bought one of these: … fbb0123c5e It’s really small (50x40mm) but includes an i2c eeprom , and sdcard slot, and all MCU pins broken out. I have still not used it, but plan to use it for my …

Spark Logic archive EEPROM emulator how to use on Maple Mini ? z1rqdym Thu Sep 17, 2015 2:50 pm I want to use EEPROM emulation…

…ng address lines on the 24c08, but the schematic shows that all address lines on the eeprom should be grounded. I believe this is the schematic for the board you have here. The schematic rar …

…n , if it has one, or more, buttons, details of connected SD card or external RAM or EEPROM etc, and whether these external hardware items are supported (a lot of boards have SD but its conne…

…hich purely provides access to hardware functions that the core Arduino API doesnt. ( EEPROM library is the same) But… I think in reality it would be impractical to write such a library to be …

… card slot on the back, but the other doesnt, and I’m not sure if they both have I2C EEPROM It amazes me why they bother to make 2 different PCBs. I could understand omitting the SD card and …

… Fri Jan 13, 2017 10:28 pm I had a look and that flash library is for “emulating” an eeprom by using a block of flash memory, since the DUE doesn’t have internal eeprom like the AVR does. We …

… needed to store some calibration data, which may fit in these registers. I know the EEPROM can be used as well, for that sort of storage, but its much harder to update, because you need to e…

…cs compiler.objcopy.cmd=arm-none-eabi-objcopy compiler.objcopy.eep.flags=-O ihex -j . eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0 compiler…

…er user interface a connector for the ESP8266 could be useful. ( BLE ? ) An external EEPROM or FLASH can be useful. lkcl Sat Oct 07, 2017 7:10 am [ChrisMicro – Sat Oct 07, 2017 4:36 am] – to …

…u don’t mind sharing. dannyf Tue Sep 05, 2017 12:20 am the observation of more ram / eeprom than specified in the datasheet on some stm parts has been around for a long time. I tried that on …

…ries from the USB. Ive also thought to put a link in to connect the CS to either the EEPROM or the SD card on the TFT shield – all usable pins were used so I cant have a CS for both. Once I h…

…ot-End, bed) d) 2 Power outputs PWM (Hot-End, bed) e) 2 UART f) 1 (SPI More CS) g) 1 EEPROM (Microchip 24LC1025 or smaller ) Regard drk zmemw16 Tue Jan 19, 2016 4:27 am glad to see you found …

…NIMUM code for continuous Serial Output only, without displays, encoders, switchers, EEPROM and so on. Only RAW array – Time, ADC1, ADC2 for PC-based analyzing. It`s hard for me cleaning many…

…ed a Black Magic Probe.. sounded like a cool thing to have, certainly for in circuit eeprom reading etc, but maybe more.. carl0s Sun Apr 15, 2018 8:56 pm [ahull – Sun Apr 15, 2018 5:28 pm] – …

… but the 2 others were behind 2 hours/day. SO I turned back to DS3231 with its 24C32 EEPROM . Hope you can improve the situation. hyperion Mon Mar 26, 2018 1:31 am i test maple mini with exter…

…via SPI (TMC2660) [*]20×4 Character LCD (RRD Smart Controller) [*]Serial over USB [*] EEPROM emulated in flash The current ‘structure’ is composed of these elements: [*]Fork of STM32GENERIC co…

… pay a little extra for the ESP32 boards with the “tin shields” covering the ESP32 + EEPROM as this configuration is RF/Noise reducing. Just for playing and DIY projects, the strict FCC stuff…

…re В индексированной копии видна ветка от июня 2017 года. Автор luca_stm32 подключил EEPROM к PB10/PB11: программная реализация I2C работала, а HWire на I2C2 останавливал выполнение после выв…

…36 am This lib works on STM32GENERIC, with yours I’m getting no lucky. EDIT: Default EEPROM is W25Q16, I have to replace mine because was return wrong numbers, now is W25Q64. stevestrong Mon …

…please try another one’ type message. Next step, I suppose, is to install Linux on a USB stick , and see what that makes of it. Either that or dig around the forums again to see if I can get it w…

… Hi, i was looking for the option for usb host controller from stm32f. I want to use usb stick and collect some data from stm32. i need .. The full discussion was unavailable in the source captu…

…nous blink. with my large hands its a pain, so regardless i tend to wire up a stlink usb stick on 22/21 (22 clk 21 dat) i also tend to connect a usb/uart module on a9/a10 as well. no supplies to…

…using the built-in ST serial bootloader over UART or I2C” in other words, you need a usb to serial adapter to use stflash, and you need to connect the correct pins *and* set the correct BOOT jumpers…

…luePill often needs hardware changes to make it work correctly and you’d also need a USB to Serial adaptor to Flash the bootloader onto it, because none of the eBay or AliExpress sell them with the …

… but from what I have seen, it doesnt seem to be widely used. Why not just hook up a USB to Serial adaptor to USART1 ( PA9 and PA10), Slammer Thu Oct 06, 2016 9:39 pm stdio through SWO requires some…

…begin(115200); // Ignored by Maple. But needed by boards using Hardware serial via a USB to Serial Adaptor pinMode(3,INPUT_ANALOG); //set all used pins as INPUT_ANALOG, in the example 3,4,5,6 pinMod…

… program the BluePill? With ST_link?? davemorl Thu May 31, 2018 8:58 pm With an FTDI usb to serial adapter. Ok, so will I be able to use these pins still when using the display? davemorl Thu May 31,…

…USART 1 Serial2 prints to hardware USART 2 etc When uploading via “Serial” (external USB to Serial adaptor connected to PA9 and PA10 (USART1) on the STM32): Serial.print(“Hello world”); will print t…

…e or its its interpretation of valid data. There is nothing to stop you connecting a USB to Serial adaptor RX input to the RX input of the Maple mini and look at the data that appears on both, to de…

…press.com. I burnt the new bootloader 2.0 named “maple_mini_boot20.bin” via FTDI 232 USB to Serial . When I tried to upload sketch from Arduino IDE, it gave errors about not able to find any DFU devi…

… rules installation script in tools/linux/install.sh. Note. If you are uploading via USB to Serial or STLink etc, you may need to set the relevant permissions for your specific upload device in orde…

… IDE), but the main one if whether there is USB serial (as some boards have built in USB to serial devices, so don’t need or want USB Serial) Krish2487 Tue Jan 10, 2017 6:40 pm It seems more and mor…

… them as fast can communicator. I connected a PCA82C250 transceiver to PB 8 and 9. A USB TTL is connected to A9 A10. The hardware is connected to some car modules on desk i know about that the…

…ough: one disadvantage of using the STM32F030 is, i now have to write/port/find some USB-to-UART plus DFU support firmware before being able to easily program the L471. yes i have reset and boot0 …

… 8:01 pm if you have access to PA9 and PA10 ( UART 1) and Boot0 you can upload via a USB to serial adaptor. I would have thought that one of the STM32 bootloaders would work, but it depends on what …

…olution, as this can be flashed onto a $5 STM32 board and provides both SWD and also USB to serial RogerClark Fri Oct 30, 2015 9:37 am Just a bit more information, you may already know I plugged in …

…9:16 pm If you are very good at soldering, there is nothing to stop you connecting a USB to serial adaptor to the dead STlink, and its possible that it is blank and just needs to be flashed. I recei…

… for when the ESP32’s are actually available I was thinking that it should include a USB to serial converter and if necessary the program and reset buttons – however I’m not sure if the ESP32 has th…

… truly portable scenarios). RogerClark Tue Nov 14, 2017 11:56 pm I had a go at using USB to serial on an Android device some time ago. I think it had some drivers installed, but only for specific US…

…high clock speed by some clever trickery though. An alternative would be to add a $2 USB to serial converter on serial1 or whatever, and abandon the on board USB. The ability to send the captured da…

… it) every time you upload code. Third method would be serial upload with a separate USB-TTL converter – but: Why should you do that, since you own a ST-link (clone)? ;)Wink BTW: STlink works …

…Roger’s video on yourtube “ in which he said said that “The board is connected via a USB to serial adapter, which is connected to Serial1 on the STM32.” by that what does he mean? Does he mean that …

Spark Logic archive LiFePO4 for small projects – crazy connections mrburnette Sat Jul 11, 2015 5:18 pm This is a controversial …

…ractiveness is the 220mv dropout voltage, this would make it feasible to feed a 4.2v LiPO battery into the 5v lines, and there is sufficient headroom 4.2 – 0.22 ~ 3.9v to keep running off a…

…anada 07 April 2017 03:28 EDT ag123 Fri Jun 02, 2017 8:29 am there are also various ‘ lipo fuel gauges’ and coulomb counters which might be useful if one is looking out for a ‘battery meter’…

Spark Logic archive Maple mini and RC lipo ’s – how to taste the black magic smoke again madias Tue May 17, 2016 11:52 am Just a little warning…

…age (9-30V). It is based on well known (but a bit old) MC33063 regulator. – On board Li-Po battery charger with automatic power supply selection. MCP73812 charger is used, adjusted at 70mA c…

… one or two failures, including a DAC board that arrived pre-smoked, and a couple of LiPo charger pcbs that didn’t do anything much. I’ve also had over delivery of some items, and a couple …

… runaway from short circuit. I know LiFePO4 cells are not as much pyrotechnic fun as LiPo , but they can still convert a large number of amps in to a large quantity of heat very quickly. Rog…

…e belly with just a USB lead to connect him to the laptop and eventually a couple of LiPo batteries will be added, since our porcine friend has plenty of spare girth to accommodate them. Im…

…t getting onto the cell etc etc. I tend to do the same thing as you have done, using NiMh . I converted an external temperature and humidity sensor to use rechargables and 2 solar panels fro…

…vironmental RF for example) from the room, due to the long ground wires acting as an antenna , that it swamps out the signals. Are there RF screening cans surrounding the high frequency GPS com…

…t certainly both are dupont leads, but then again they could be 2 off nrf24 with big aerials or 2 off 3.2″ LCD; the LCD’s were ordered 19/2 . none of my orders still to be delivered are older …

…opment, the board purchased from Adafruit shows a consistent 3db gain in the onboard antenna . I’ve tried this with 4 different clone boards and the antenna signal on the official dev board is …

… thus it costs like double of the ESP-01 price. And you would still need an external antenna . There also doesnt seem to be another small board with pin headers, except for the esp-12 lineup, b…

…the CRC coprocessor for the CalcCRC command to 0x6363 PCD_AntennaOn(); // Enable the antenna driver pins TX1 and TX2 (they were disabled by the reset) Obviously the rfid reader no longer works…

…atching. I had a quick look at readme.h Could you not use a trimmer capacitor on the antenna to get it resonant at the correct frequency, rather than changing the number of coils? fredbox Tue …

…ypunch Fri Jun 02, 2017 11:04 pm @ag123 I am likely to run the device on rechargable AA batteries and not a LIPO. Availability is primary factor, and LIPO in colder temperatures is second factor. F…

…g looks fine… Maybe a missing common GND line between SD module, BP and the external power supply ? Do you have a picture of your setup with BP (not with MM) ? ag123 Wed Jul 26, 2017 2:20 pm [aster …

…AN2586 Getting started with STM32F10xxx hardware development … 164185.pdf page 7 1.2 Power supply schemes seemed to suggest there is both VREF+ and VREF- it would seemed VREF- would normally be gro…

…ot without any reason. The Baite clones and all other chinese boards have one common power supply for analog and digital, so it seems hopeless. That’s why we tried the separated boards, which seems…

…it, extended the sides up to give more room for a raspberry pi, soundcard, and dc-dc power supply converter. I’m going to put a few knobs and a hd44780 screen in the top, and a couple of MIDI socke…

…ten in macro-11 through any of the sub-systems(8031/2,8051/52), adc, dac, controlled power supplies , relay card types and STT’s, interfaces to ieee equipment to the inside of the target uut. object f…

…Support the full range of STM32 SWD interface debugging, simple interface (including power supply ), 4 line speed, stable work;! Interface definition shell directly address Do not need to read instr…

…ly 5v connected for both VadimEL Wed Aug 31, 2016 12:09 pm but not in my case. Image power supply only 3.3V =) stevestrong Wed Aug 31, 2016 1:40 pm It’s strange, the on-board 3.3V regulator supplie…

…ges and test them individually in a scientific way. E.g. if you think the problem is power supply noise or instability, then power the GPS from the Maple but connect the Serial data lines to the AV…

… not depend on this, specially with questionable quality parts. All cheap breadboard power supplies use AMS1117 in SOT-223 package. The power limit of this device is very low, try to feed it with an …

…start behaving oddly, not resetting, not booting and so forth, I tend to suspect the power supply first. Having said that, I recently built a simple opto-isolated serial board for my multimeter, fr…

…n (but a bit old) MC33063 regulator. – On board Li-Po battery charger with automatic power supply selection. MCP73812 charger is used, adjusted at 70mA charging current. – Separate 3V3 regulators (…

…same result. Looks like it stuck in some sort of DFU-Reset loop. I tried a different power supply , nothing changed. I’m kind of new to all these and I’m out of ideas. If you want me to try anything…

…teith Sat Jan 16, 2016 10:19 pm Man, wish I still had the circuit we used on our 5Kv power supplies I used to work on. They used a circuit tied on the ground side to measure current and displayed on …

…hanks Matthias I have an old Casio keyboard which has midi, but I’d need to find the power supply , as its been ages since i used it. If the change to USB_MIDI_RX_EPSIZE seems to fix a problem, perh…

…ox prototype today and the signal looks terrible. Maybe I should start with a better power supply . bianchifan Mon Oct 19, 2015 4:32 pm Nice little project, unfortunately it still fails compiling. A…

…rivers here Smile I do not checked exactly the datasheet for TMC2130, I now see that power supply should be 5V. But I do not see this a problem, on the shield you just build a 5V power supply that …

…ystems and wireless chargers.. High-resolution timer: 217ps, self-compensated versus power supply and temperature drift.. 217ps resolution available for all operating modes.. Transparent high-resol…

…kage. Decouple each opamp package with 10uF || 100n close to their Vcc/GND pins. The power supply wiring – a good decoupling is required, “star wiring with Vcc and GND module’s wires” with a single…

…iles range.. RogerClark Wed Nov 15, 2017 7:43 pm Depends on what voltage you need PC power supplies are a cheap ( often free) way to get quite a lot of amps at 5V or at 12V ( I am using one to power …

…B port fully-connected to the on-chip USB interface (PA11, PA12) and can provide the power supply ; a 5V to 3.3V regulator; two oscillators; two push-buttons (one ‘reset’, one for the user program);…

…op multiplier value depends on crystal osc freq and also even if you use an external crystal oscillator its all setup in the various variant folder files. Phisatho Sat Nov 05, 2016 7:47 pm Do you find an…

…ted a devboard based on the STM32F030F4P6 chip because I wanted to experiment with a TCXO . Image I have details and more pictures here: stm32f030 devboard I learned through this that 0603 p…

…re more expensive when I bought them last year. The one thing they lack is the 32khz crystal oscillator which means they do not keep time very well when sleeping. Initially the repo I used / modified fro…

…stal manufacturers collusion deliberately engage in out, the purpose is to improve a crystal oscillator manufacturers high-end crystal sales. Recently made a few boards also used the STM32 RTC, before an…

… short term and long term stability to think about. But in the end, the DS is just a crystal oscillator with some hardware around to condition it. I think that if you could calibrate and compensate for t…

…, or make them into a current meter stevech Sat Jan 16, 2016 12:27 am Can’t use a $1 hall-effect sensor ? Or split-core transformer? RogerClark Sat Jan 16, 2016 1:50 am Steve I’d like to use a hall effec…

…3, 2017 1:41 am You see, suspending common objects as desk fodder with a short range Hall effect sensor is common-place. But I want to find out what would be required to suspend/levitate a tiny neodymium…

…esn’t help me any Smile it’s for a periodic frequency, and designed to help locate a speaker in a room (2D space), using 2 microphones. My code works on percussive sounds, with a 4 microphone …

…master RogerClark Sat Nov 11, 2017 8:41 pm Thanks Steve.. Can you post a link to the speakers … It looks like they are piezo , but are much bigger than I have. BTW. I had a crazy idea because I …

…ate event to do the same, so the processor has now plenty of time to do other tasks. Speaker out on PB6 (timer 4 ch 1). No interrupts are used, although one could use the DMA transfer end IRQ …

…transistor you may want to look at an alternative device which is more like a normal speaker . There are some small beepers which are not piezo which you could use, (but they often take a lot o…

…them. … Fair enough, you’re the author of the IDE, you can stand on your soap box in Speakers ’ Corner and shout the praises of your creation. But, I still have to work daily with the ArduinoIDE…

…tent with their RSSI readings. And I sure everyone wants me to jump on my soapbox at Speaker ’s Corner and sing the praises of spending too much money with Adafruit or Sparkfun, but I will not,…

…ow cost. You can see it here: . What are your thoughts about it? (non-native english speaker , I apologize in advance for any writing mistakes) RogerClark Wed Sep 27, 2017 9:17 pm @spon! Very n…

…ve said is that all boards receive the message on the RX port (including the current speaker ) and there is no bus Master board (even one is equal). You can control how this works entirely in s…

…st possible sound and gain, but just so I can hear something clear coming out of the speaker and I know the MP3 is being decoded right and that’s not choppy due to decoding taking too long, et…

… to 3.3V 0V – 1.2V = 120Hz-30Hz. 1.2V – 2.7V = no pulses 2.7V – 2.8V = toy music -on speaker 2.8V -3.3V = 200 Hz – 40 Hz ted Thu Sep 06, 2018 2:26 pm I changed this line. //ovfDiv2 = map(ain,0…

…only. And 3.3V signals, of course. *Pito: It is possible via the clamping protection diodes each cmos device gets on its inputs/outputs. ahull Fri Oct 07, 2016 10:39 am For the record, this -…

…GPS’s TX/RX 5V logic? If yes then you are powering the BP via the internal BPs clamp diodes from the GPS’s TX/RX pins as they are 5V idle. Put 1k (or 2k2 or 3k3 or 4k7) resistors in series wi…

…bly on 6502 when I was 13, I learn a little bit of electronics (transistors, opamps, diodes , etc as a 13 year old). rajdarge Fri Apr 29, 2016 12:03 am Ok well I can afford to put my project o…

… and therefore only need a battery/battery holder (possibly with an in-line schottky diode , put probably not) to allow us to get the RTC operational. What I have discovered so far. 1) There …

… powering from the USB jack anyway, just kinda sucks I damaged it. I measured the D2 diode , very high resistance in both directions. Could I remove the diode and replace with a solder connec…

… that was around 1988 so forgive me. lol Best I can remember there were back to back diodes tied to ground and the 2 inputs of an op amp across that. Of course with adjustment for the gain et…

…cuits could directly accept: a situation that would mandate some voltage regulation ( diode , LDO regulator, etc.) to be utilized thus causing wasted battery power due to Vdrop. In the configu…

…RS232, but my plan is to make nrf52 logger. I did try to measure voltage directly on diode , but it is only 1.2V so I will need to make small board with opto transistor so I do not mess much …

…ance which at 12V would let 12nA of current, well within the (built-in) ESD clamping diodes ’ specifications. Though I haven’t been able to find the hard specs in any technical reference. Obvi…

…in is still a goal. I think i pulled the mosfet design from the ramps-FD and added a diode . (Note to me: dont forget to add their names later on. Very Happy ). To the naming.guess that Name …

…o realize as the of the DSO138 and you can build in an overvoltage-protection with 2 diodes or two antiparallel white/blue leds (not tested, but very small leakage currents, but perhaps probl…

…ome configuration jumper pads used to set the interface mode. Put your multimeter in diode test mode, and probe between the A and K pins, and you may well be rewarded with a dim glow from th…

…g to external hardware, without any significant mods to the board. I connect a BAT46 diode in series with VBB, and connect a coin cell to it. My experience with calibrated, room temperature …

…n. Before I go do it, can I clarify that the pull-up is required on both lines and a diode is required on each tx line ? Each MCU in this setup can therefore read every transmission and conf…

…is is a slightly older version which doesn’t include the 22 Ohm resistors or the TVS diode on the D+/D- lines. There might be one or two other minor mods, but if you want to look at the sche…

…s board. To use this feature you need to do some things: o Add a voltage divider and diode on pin PA0. Use 4k7 resistors and connect to your TARGET VCC (On the c8 board it is broken out with…

…he incoming 5V from the USB input via the VIN pin. But I can’t remember if its via a diode from USB power, and when I tested on one of my Maple minis it showed 4.8V Just check whatever you f…

…l on them and therefore only need a battery/battery holder (possibly with an in-line schottky diode, put probably not) to allow us to get the RTC operational. What I have discovered so far. 1) …

…hat it is important to have a stable external voltage there. I’m now using a pair of Schottky diodes to supply it either from a battery, or VCC. I already have a compensated clock running on my…

…1. Download the Arduino IDE 1.6.4 (just the zip file = ~143MB) 2. Extract it on your Hard drive (ex c:\arduino) 3. Download the STM32Duino. 4. Extract the master.zip file. 5. You will see a folde…

…-x370/ some of the connectors are standardised, e.g the PCI, PCI-express slots, SATA hard drive cables and slots, drams slots are standardised so do things like SSD m2 slots etc, but the sheer nu…

…st), re-using a case and the PSU of a xw4300 HP workstation and re-using some stuff ( HDDs , DVD/BD burner, cables…). This time I installed Mint KDE 18, and I must admit that it is one of the…

…rent drawn for monitoring phone charging. I have a simple inline dongle which has an OLED display and works well to give instantaneous measurements, but I’d like to plot charge current over time e.…

…to learn stm32 at the same time be a big jump and learing curve? I plan on having an LCD display with buttons to increase and decrease the angle needed, a back to zero degree button, stop button, …

…ight, closing the window during the measurement would be a good idea. Otherwise your LCD screen stops working, sure.. RogerClark Wed Aug 17, 2016 9:35 pm LOL. You need a very long USB cable to te…

…ogramming by STlink = easy. Lean software implementations of a Serial substitute and OLED display , to get past the limited flash constraints and pin assignments. It works. From this point, we can n…

…o be calculating MPH and RPM and display those details on motorised dials leds and a lcd display :p BTW I’m coding from PlatformIO and building and uploading from arduino IDE, cant seem to upload …

…ve 16 BIT HX8357C nyx123 Sat Jan 20, 2018 4:49 pm Any wiring diagram from my 3.2 tft lcd screen shield (16 bit hx8375c) to my “bluepill” ? I connected with my own but it appears only a white scre…

…ms. Now comes the question, and bear in mind that this is the first time i’ve used a tft display , would this performance be ‘sufficient’, to me it will only serve as a gui with buttons and showing…

…o-mini (as the HW needs to be tiny enough to be built in a gun.) but coupling an SPI OLED display AND ESP8266 AND buttons AND LEDs AND a Laser AND IRsensor AND an MP3 module for the sounds Even if …

…glib libary work with an STM32f103c8t6 board? I would really like to drive my 128×64 OLED display via SPI. It works with an Arduino board, but fails with my STM32f103c8t6 boad (giving compiler erro…

…. I have board which is up and running. I was searching for libraries for TFT_320QVT tft display . i searched over the forum, but i got confused. SSD1289 IC driver is for tft control. This lcd has …

…100mA scale. At a float current of 5mA on the cell, the actual voltage on the uC and OLED display is: 3.45V. When I pull the lab supply feed, the battery current goes to approximately 70mA with pea…

Spark Logic archive Cannot make OLED display to work with hardware I2C in Adafruit_SSD1306 library vagaus Sat Aug 01, 2015 5:32 pm Hi. This is m…

…Apr 02, 2016 2:09 am I guess it could also be usable as a general purpose board with LCD display , but I’m not sure its especially good value, at $17 (Considering the cost of the components is prob…

…AL already working with the core functions, need to add the eeprom support, and test LCD display , sdcard, but all those things are already working with our cores, so should not be an issue at all.…

…rom the U7 external flash memory SPI. The display connector has 18 pins, 13 used for LCD screen , 4 for LED backlighting and one unused. The display shows the TFT240QV1-V1.0-15Z01, the 024guf1-v4-…

…ing shipment of some STM32 boards that have onboard sockets for such things, even an OLED display . So I need a better reason to use it. Also the DS does not provide access to fractional time as the…

…hat alone takes 6 pins and more than likely we’d still want to interface our ILI9341 LCD display , i think the total pin count considering all that would lead us to run out of pins on blue pill or …

…aple Mini with an ENC28J60 and MFRC522 on the SPI bus. I would like to add a ILI9431 tft display to show some door entry messages. When I add the tft display to the same SPI bus and run a basic tf…

… the pin. The main reason that I got the STM32F407VET was to learn how to write to a LCD screen in parallel. I have a 320×240 screen that has 8 bit parallel pins broken out along with RST, CS, RS…

…. Obviously It now compiles nicely. Now i can focus on making a demo for the ILI9341 TFT display , with PicoJPEG and your lib. Thank you. I’m using SPI1 for the ILI9341. Do i need to set a dedicate…

… Paul zoomx Fri May 13, 2016 10:46 am I found this german post IRMP on STM32 – a USB IR receiver / transmitter / off switch with wakeup timer … keup-Timer Here with Google translate … edit-text= J…

…with this switcher: Up to 17V input, 3A output, 2MHz, 90% eff at 1A, with integrated inductor , 3.0×2.8mm package. Maybe it could be a good replacement.. Smile zmemw16 Fri Jul 28, 2017 11:43 pm …

…of hundreds of wires, all capacitively coupled together. Use a single ground, put RF chokes in both ground and supply to the BP, keep wires short. If necessary, shield the BP inside a alumini…

… depth. I have little experience with actual compilers, 99% of what I do is find the choke points or fill in missing bits for programs or machines. Setting compilers up is something new for …

…ial adapter cable required for connecting ST-LINK. – The power supply capacitors and inductor are very tall, any shield on top of the board cannot be placed correctly. I think that they correct…

…ss the ADC vref will probably eliminate a lot of this. If not on your board, a small inductor in the Vcc line to the Analog portion of the chip is also helpful. Original boards were 4 layers wi…

…ould be too close to each other for the wire-wrapping pen. I tried to cut a piece of ribbon cable with duponts into half and solder the JST and DuPont wires together, but the solder didn’t stick to…

…s etc on the wiki here … 4xx_boards the idea is that after all these days, there are dupont wires … s&_sacat=0 that would overcome straitjacket fixed pins and board layouts demanded of shields thes…

…sing ESP8266) but I’m still going to try with shorter wires. I was testing with 20cm dupont wires , I have some 10cm now. My next chip test will be the ESP32… it has lots of everything Smile RAM, sp…

…sual trouble shooting tricks. The cause was poor soldering on the display board. The ribbon cable connecting the display to the board had partially separated from the PCB. A little microsurgery lat…

…ttled out in the end, and I will use a Maple Mini attached to the board via a 5 wire ribbon cable . The board has both high voltage, high current, 240V 20A, and low voltage devices on it, (optocoupl…

…ng tracks of the board and ruining it Sad Its probably easier to get hold of another ribbon cable connector and a Blue Pill board and use that instead of the MCU board thats in that device. carl0s …

…at least make sure you’ve got the basic stuff like the wires Smile. i’ve got tons of dupont wires (male-male, female-female & female-male) just for the reason you just mentioned: it’s so stupid to …

…ed me that running clocks and data at 10s of megahertz , down bits or normal wire or ribbon cable , works at all ;-)Wink These sorts of frequencies would have been considered “High Frequency” RF abo…

… analog Vcc supply ( filtered or via a second regulator), and optionally including a micro SD on the bottom of the board, like the Teensy, so its not going to be quite as cheap as these pill bo…

…have not decided if and what communications device I will use. The design needs a SD/ MicroSD as part of the minimum design. For sure the design only needs the communications device on in what …

…C there were ILI9320, 25, 35, 41 and 86, all with resistive touch w/o controller and micro SD slot. The adafruit libs didn’t work for me, same for all other libs recommended by all those lovely…

…e a magnifier to find out differences) Personally, I like those, since they have the MicroSD . RogerClark Sat Jun 13, 2015 3:33 am Umm The one with the SD is actually cheaper than the one that …

…0, 2017 3:46 am Just throwing in another thought: I found it quite useful to have an micro-sd -card-connector directly on the board ( like on the F407black or some discovery boards ). This could…

…gulators (MCP1700) for digital and analog power planes. – On board CAN interface and micro-SD slot. – Custom UEXT connector for external peripherals (Olimex has many UEXT boards, like RS485, Et…

…is not only NodeMCU, but also Wemos-D1-Mini that works fine and has few shields such MicroSD . strawberrymaker Wed Jun 01, 2016 6:54 pm @Erni Isnt that just a Kickstarter for the SDK? They just…

…t Jun 06, 2015 9:11 pm Thanks Matthias I think I can now make it work with one of my micro sd cards, but I can’t seem to make it work with a full size SD card (though a different adaptor) It do…

…e a RepRapDiscount Full Graphic Display. But still an aditional SD Card adapter (not microSD ) Actually relatively proper Silkscreening ESP-01 Socket. Bit more experimental, but there are actua…

…located in EU, I can send you some boards as soon as I receive them, along with some microSD Card connectors, I have a few of them. Please send me your address as PM. parasole Thu Feb 08, 2018…

… flash to play with. in addition a good number of those f4 boards from ebay has that micro sd card slot built on board which is an additional convenience for stm32f103 the ‘common’ boards appar…

…… martinayotte Mon Jun 08, 2015 10:12 pm After the NSS vs CSN saga on SPI, I got the MicroSD working on my Netduino2Plus. I’ve used the SD lib, but I will try again Victor’s SdFat, it should w…

…e UNO (with the 5V multi-converter chip) … 59_679.jpg SD cards tested: Transcend 4GB microSD : not working, 2GB micro SD (no brand) working. Maybe a formatting problem? Edit with the successful…

…e today’s results are with SPI1 and the divider is DIV2. The card is an old Kingston microsd 4GB class4. With buffer size 512 in the “bench” it does not matter what the SPI speed is (DIV2 DIv4…

… mass storage (like an usb drive) when plugged to a PC providing files stored from a microSD card used with a shield. sorry for the inconvenience if my message is innapropriate but I can’t fin…

Spark Logic archive issue with sd card aster Tue Jul 25, 2017 8:12 pm hello i have this SD module, sdfat version 1.0.3, external ttl-seria…

…g. What pin the button is on , if it has one, or more, buttons, details of connected SD card or external RAM or EEPROM etc, and whether these external hardware items are supported (a lot of bo…

…details about how exactly do you test? Do you read blocks of 512 bytes on SPI 1 from SD card and read blocks (how many bytes?) from ILI display repeatedly? Do you use the older SdFat lib or th…

…n on processors with more RAM, I would need to store things temporarily in flash (or SD card ). Since it would be nice to store all samples on SD card (for post-processing with better tools), a…

… is freed up can be used for other purposes e.g. it can run usb mass storage & map a sd card to a drive and it can even at the same time double up as a mouse when paired with an optical sensor…

Spark Logic archive USB mass storage / SD card + speed madias Wed Sep 12, 2018 10:09 pm As I tried to get more reading/writing speed for Arpuss “U…

…g at the VS1003 lib and thought it would be good to try to playback and MP3 from the SD card , but rather than running both the SD and the VS1003 MP3 player on the same SPI, I thought I’d chang…

…e a project in which I need some short sound effects, without reading WAV files from SD card . To output PWM audio, current solutions use timer interrupt to update the new value in the compare …

…to also add a “nice” GUI to my project. I ended up ordering a chinese 3.2″ tft+touch+ sd card combo, but what i didn’t know or think of beforehand was to check the connectivity needed (i just r…

…so, the LED on one board is connected to PB9 rather than PC13. Also. One board has a SD card slot on the back, but the other doesnt, and I’m not sure if they both have I2C EEPROM It amazes me …

… of) megabytes on a chip) and even additional flash (this might be in the form of an sd card ) it would be a RPi ‘competitor’ maybe not directly in terms of speed but that in both the combinati…

…iguration is this: I2c devices: RTC, Fuel Guage SPI devices: TOuch panel, TFT panel, SD card . One wire devices: 5xDS18b20 PIR, BUZZER, WS2812b (as a status light). <…> rajdarge Thu Apr 28, 201…

Spark Logic archive SD card SDIO RogerClark Sun Jun 07, 2015 12:21 pm Just in case this is handy, I found some code that we may…

… pm I have a Web server application running on the BP, attached a W5500 board and an SD card , SdFat beta taking care of. The HTML page requested by the client has 4 embedded pictures, the HTML…

…t it’s the variety of functions that make that really hard. about the on-board micro- sd card idea: i really like it! except…. i used the 100-pin variant not the 144-pin one and it would be a c…

…ou, how many slaves do you have? I have a bespoke device that has its own SPI slave ( SD Card ) and has a break out for extra SPI slaves along with a master SS, which I connect to a maple mini, …

…Mon Feb 20, 2017 7:06 pm yes, its true. And may be more pins(+4) if i decided to use SD Card for images. btw, which library will support for this tft with maple mini. stevestrong Mon Feb 20, 2…

…e F405RG is as same as MapleTree, with about 3000mAH Li-ion Battery, no ethernut, no sd Card , priced at 45$. peripherals will be in extended board like Arduino. martinayotte Sat Jul 16, 2016 5…

… is possibly a good datalogger board and there is this notion that inserting a micro sd card may literally expand storage to gigabytes rather than several hundred k Laughing like martinayotte …

…o the USB port, and an SMB share from my shared folder on the LAN for GB of storage. SD card on RPi is not used by my programs. So I use VNC to run the python programs. And the Python IDE (fre…

…7f5b322f RogerClark Tue Mar 08, 2016 9:24 pm Small but expensive and lacks the 32khz crystal that allows it to operate in its very low power modes. Waveshare do some slightly bigger but which …

…purely in the boards.txt , because the phase locked loop multiplier value depends on crystal osc freq and also even if you use an external crystal oscillator its all setup in the various varia…

…iny’ board with all the pins broken out and has an on board uSD card slot + on board crystals then there are some other worthy competitors that are discussed in the thread among them this board…

…на Blue Pill частоту 8,000600 МГц вместо 8 МГц. Обсуждались нагрузочные конденсаторы кварца , температурный дрейф и применение более стабильного источника тактового сигнала.

…ater. It stopped sending data almost immediately (last data 40C). Immersing only the crystal part/side of the pcb into the boiling water stops the data, so it seems to me this part is critical…

… on the microcontroller (on AVR devices you use the memory fuses)? I’m using a 16Mhz crystal to reach the 72Mhz. If you want, I can send the codes, the libs and the board schematic. Here is a …

…r is roughly 0.019ppm/week). The new boards also have a LSE, but it’s just a regular crystal . I’m using TIM14 to compare the LSE frequency to the TCXO. Some notes about measuring the LSE: To l…

…er power consumption? How can I decrease frequency? Now I have blue pill with 8.0MHz crystal and ticks at 72MHz. Is possible to set frequency to for example 2 or 8 MHz instead of 72MHz? Can I …

… used to be a separate GD32 core, which was for some small boards which have a 12Mhz crystal , but I removed it ages ago, however you may be able to go back through the github commits and find …

…have read the topic on the comparison of the two)? Besides replacing the 8MHz quartz crystal with a 12MHz one, are there any other changes required? Thanks! Rick Kimball Wed Oct 21, 2015 1:19 …

…3XXX – We briefly touched on this before. Most boards have a 32,767 Hz oscillator or crystal on them and therefore only need a battery/battery holder (possibly with an in-line schottky diode, …

… variant before so know what i’m doing, and love this particular series because it’s crystal -less and really really low cost. $1.66 in 10k volumes as opposed to (in the case of the ATSAM3X8E) …

…I tested in my house and this normal functioning , thank you. Another question , the crystal is on the board is 8MHZ but works in 8MHZ or 72MHz ? Another question , I’m using a dynamic IP , it…

…e on the board when it was in its case caused a sharp leg of the through hole 12 MHz crystal to pierce the insulating tape and contact one of the legs of the transistor. Image Hot glue and 2 l…

…32 bootloaders would work, but it depends on what frequency the external osciallator crystal they use. If the use 8MHz the normal STM32 bootloader should work Slammer Sun Oct 16, 2016 7:17 pm …

…r this happening) I have seen wierd things happen if there is a fault with the 32kHz crystal ( which is unlikely in your case) Someone gave me some 32khz crystals to use with another mRF51822 …

…ost as much as a blue pill stm32f103, but the board producers throw in a shiny 8 mhz crystal Very Happy … 0&_sacat=0 but even an stm32f030 is significantly more elaborate than do the stm8s it …

…dverts and cash flow is the magazines circulation numbers. I certainly do not have a crystal ball and my Gypsy consultant has moved on to reading palms in downtown Atlanta, but I would venture…

…ng LSE j-zero Thu Oct 22, 2015 5:19 pm Hello, I’m trying to use the RTC with a 32kHz Crystal on LSE my Maple Mini Clone. I can use LSI without problems, but it’s not accurate enough (3 seconds…

…s are not working… ahull Fri Jul 31, 2015 9:42 am If your board doesn’t have the RTC crystal fitted, one of these will do the trick. I have fitted 4 of these so far to different boards, and th…

…r. zoomx Thu Feb 02, 2017 9:44 am I was very lucky, I got only a nodeMCU with broken reset button and a nasty STLink clone that works with STM32 but not with STM8. I suspected that something was wr…

…til was searching for dfu devices. The maple mini worked better, as I just press the reset button when dfu-util is searching. I dont know why the reset button is not resetting the usb on the BluePi…

… from upload point of view, Arduino IDE can support it. The button on the board is a reset button . The LED will be on when controlling the port pin PA4 to logical high level. I did not checked the …

… like the Baite MM. It is not a Red or Blue pill board. My fingers slip on the small reset button so I understand the reset button challenges. I do appreciate your noting the pins I will need to us…

…Link only. So I decided same on maple mini. At least I was successful with help from reset button . The sketch was loading fine but it didn’t like to run, several tries, no chance. So I installed th…

… come with. Now put the board in perpetual boot mode. To do so you just need to keep reset button pushed (close to the LiPO connextor) and meanwhile push also the “button” (close to the mini usb co…

…d that, didn’t work. Here’s the complicated part. RBL says you should just press the reset button , and it will wait for connection for 5 seconds in DFU mode. But reset button is not connected to NR…

…d seem part of the costs comes from the component counts e.g. an 8mhz crystal, leds, reset button a boot0 jumper and a generally well done board with a proper silk screen. i won’t say that this is …

…e interrupts – quick. mausi_mick rexnanet Mon Nov 14, 2016 3:08 pm The encoder has a push button , so there’s no need for 2 encoders. With the push button you can switch between the 2 (or more) fun…

…ugth no I see you already planned the expansion on E1. You may also want to move the reset button somewhere more to the edge of the board, although that’s hopefully not needed often. [chrissb – Mon…

…or sleeps with greater, unpredictable intervals, going into > 10 hours. Pressing the reset button (no battery pull needed) get’s it on track again and the same story repeats. I found the ST Applica…

…PA12) and can provide the power supply; a 5V to 3.3V regulator; two oscillators; two push-buttons (one ‘reset’, one for the user program); two LEDs (one for ‘power on’, one for the user program), a…

…for uploads, even with my maple-mini : Relying on DFU or Serial available thru Boot0 push button as described in STM docs. When I first assembled the Frank’s STM32Stamp, I was using Serial with st…

…ce it to reset and rerun the firmware. This is so the user doesn’t have to press the reset button when it is done loading. Here is what I have right now: tools.sloadhost.upload.pattern="{path}{cmd}…

… we could program a generic STM32 board without messing with the boot jumpers or the reset button (that could be managed by the firmware in the AVR arduino) and making use of hardware you might hav…

…is is more trouble than it’s worth. Smile I’d rather just pull the plug or press the reset button instead of testing things on three platforms. RogerClark Mon Dec 11, 2017 9:53 pm [arpruss – Mon De…

…trol of the USB port. If you code messes up the usb communication, you can press the reset button and the bootloader is listening again. stevech Mon Oct 05, 2015 12:48 am martinayotte wrote:In the …

…lark измерил на Blue Pill частоту 8,000600 МГц вместо 8 МГц. Обсуждались нагрузочные конденсаторы кварца, температурный дрейф и применение более стабильного источника тактового сигнала.

… not 300mV; that’s about 5% of the input test signal. turned out the input filtering capacitors were acting as a potential divider. stephen RogerClark Thu Nov 26, 2015 8:06 pm @robca Ah. I see wh…

…esnt work too bad if you simply turn on the internal pullup resistor and use a 100nF capacitor between the output of the rotary encoder and GND. I know this isnt as good as the 2 resistors and o…

…ed the code, and I can hear something coming from the speaker I attached via a 100nF capacitor , but its very quiet, and looking on my logic analyser, the waveform is not what I expected. What I …

…ks with slow toggling signals, and I don’t know why. One thing is that the filtering capacitors are missing from my LCD board. The other thing is that the LCD works with faster toggling if the LC…

…o the GPS module might provide some clues, you may simply need a few more decoupling capacitors or shorter leads. ddrown Mon Oct 31, 2016 9:42 pm jucordero wrote: Here is an example of the typica…

…: that’s primarily the ADC tracks along the bottom. there’s space to fit three 0.1uF capacitors around the 417, but that’s down to good design by ST (the power and GND being on the corners). Unti…

…nductive load (generating highvoltage peaks). A high capacitive load (ie 1F blocking capacitor at Vout) should not have destroyed the regulator as the overcurrent protection does not allow that.…

…t 0.05”. A special adapter cable required for connecting ST-LINK. – The power supply capacitors and inductor are very tall, any shield on top of the board cannot be placed correctly. I think that…

… not 32.768khz I also got similar issues when using a 32khz crystal without any 12pF capacitors . but again, I doubt thats the issue unless you have a faulty module. Do you have a spare module tha…

…FePO4 bridging the 3.3V bus… no resistors, no fuses, just the battery looking like a capacitor . I experimented. Here is what I have experimentally concluded: Yes, the battery can be float charge…

…hem that I have used, so expect them to be as accurate (or inaccurate) as mine, load capacitors (if fitted) not withstanding of course. Very Happy j-zero Fri Oct 23, 2015 6:17 am Hello, thanks fo…

…t, they have squared up the input out their probes with a couple of on board trimmer capacitors (these do the job of the trimmer on a standard scope probe). The minimalist approach I have had to …

…ic does not show me errors anymore. On the PCB, some components like the STM32, some capacitors , the switch and others, are not appeared on the 3D preview. I had to re-load the 3D shapes Footprin…

…in some situations. I had some fun 2 years ago, applying handmade foil sheet trimmer capacitors to dollar store clocks. The best of those can maintain time at room temperature to within about 15 …

…a lot of head scratching. I had a quick look at readme.h Could you not use a trimmer capacitor on the antenna to get it resonant at the correct frequency, rather than changing the number of coil…

…om the HW point almost identical, on my board I replaced the 100nF sdcard decoupling capacitor with 2x10u ceramic multilayer with no visible impact. The F4 registers are set by sdcard’s inits() …

…. mrburnette Thu Jul 02, 2015 1:51 pm victor_pv wrote: I haven’t been using an extra capacitor for SDCards, but it makes much sense, I’ll start using it from now on anytime I see any problem. ah…

…nised instead into their modular groups of connectors e.g. the motor connectors, the endstops connectors, the FET (hot end) connectors, thermal sensors, auto leveling sensors etc. And the ’empt…

…th up to 8 stepper drivers, 5 high power mostfet outputs, 2 low power fan outputs, 6 endstop IO, and some more expansion. That required a 100x140mm PCB. I ordered 10 pieces from the cheapest c…

…n a 3D printer. So, I believe that we need this: a) 4 Motor Driver (X, Y, Z, E) b) 6 EndStop c) 2 Thermistors (Hot-End, bed) d) 2 Power outputs PWM (Hot-End, bed) e) 2 UART f) 1 (SPI More CS) …

…have enough timers,and definitely enough PWM pins. there could be up to 6 end stops ( limit switches ) in addition, if we use 1 gpio pin for each, that alone takes 6 pins and more than likely we’d stil…

… there is a jpg here. zmemw16 Wed Aug 19, 2015 8:46 am i’ll do some probing with the multimeter and check the connections. all as expected per circuit diagram. b6/b7 to chip & 4k7’s come as 4k67 …

…e suggested check the other basic things 1st, power rails etc which basically need a voltmeter , it would seem rather unlikely that it works on MM but break on BP, unless perhaps some broken/cold…

…:39 am Because daniel has meanwhile done some work for the F429 disco, I added a TFT voltmeter example. It reads the voltage from PA0 and displays it. PA0 is connected to the blue button of the …

… min 1.16V / typ 1.20V / max 1.24V) after calibrating it with the Vdd measured by my multimeter (3.321V). I haven’t experimented with varying the Vdd, but that could be interesting too. ddrown Th…

…het your appetite, however for most small projects, it is fairly easy to set up your multimeter to watch the current being fed to the board(s) and get a reasonable ball park figure. keypunch Fri …

… types/models. as you’ve opened it you might be able to see what its set up for (avo/ multimeter resistance pin to ground ) and go from there next is assume spi and try to read from a register (id…

…first. Having said that, I recently built a simple opto-isolated serial board for my multimeter , from one of those cheap $2 Chinese usb serial boards and a photo-transistor recovered from an opto…

…s I flashed the S130 hex you posted Compiled a blink sketch flashing pin 4 I used my multimeter to look at the voltages on the pins and a pin with no name on it was flashing. But I worked out its…

…ll you which pins were which, but you can probably figure it out quite easily with a multimeter . zoomx Tue Mar 01, 2016 10:13 am The BMP has a complete emulation of a STlinkv2? Because STM8 uses …

…rned out by the usual suspects in China for not much more than the ubiquitous DM830B multimeter . Throw in the functionality of one of those atmega based “component testers”, a frequency/waveform …

Spark Logic archive eBay digital voltmeter modification RogerClark Fri Jan 15, 2016 10:43 am Hi Guys I bought a voltmeter on eBay the other da…

Spark Logic archive "New" " Multimeter " ahull Mon Sep 18, 2017 2:19 pm OK Its not new, since it was produced in 1944, and describing it as…

…o high. So I tried connecting both the left and the right thermocouples to a digital multimeter I have, that has a thermocouple input, and both thermocouples are fine. So the problem seems to be …

…n the design, you could also use one of the I/O lines to switch between “scope” and “ Voltmeter ” mode… in the latter mode, Mr. swine would be a Pig-O-Meter instead of a Swine-O-Scope… properly kn…

… to work on the GD rather than the STM. If you are up for a lot of probing with your multimeter and a fair amount of head scratching, I suspect we can get it to work. The LCD also has a backlight…

…hive [SOLVED] VCO ted Wed Sep 05, 2018 1:32 pm Hi I am trying to make a VCO based on voltmeter and generator programs, what I need is control Overflow of the timer by voltage applied to PA7. pwm…

… put up with this abuse of a 10k resistor and work properly anyways. So get out your multimeter and check the resistance of the USB D+ pin. If you look at the wiki and posts here you will see thi…

…chip is DE=A1D, which is also known as RT9193. In my applications, I use an external voltage regulator for all external sensors and actuators. The power of this local regulator has been enough in all my…

…e course? 3x maple mini clones arrived from China today, 2 are good, 1 is dead – the voltage regulator got very hot right after plugging in to USB, on closer inspection one side of the ST chip has ~ 6 p…

…ber to watch your power usage because when the chip is in standby or stop modes, the voltage regulator is too aro_72 Tue Dec 13, 2016 2:10 pm Not sure to catch the point. Normally WFI only affects CPU c…

…ot at the same speed. I think this works out to be roughly 300ppm/degC. I think this voltage regulator is specified to be +/-0.5% (5000ppm) over its full temperature range, but it’s not a linear relatio…

…to connect a battery to a pin directly or power via the USB. Many have commented the voltage regulators of many MCUs have low insertion related losses. So far the research reading I have done on this see…

…to connect sd-card which is on tft screen so I’m not worrying about voltage (because voltage regulator onboard) This is the TFT on which screen and touch is already working. I have formatted (under Ubun…

…the Teensy. But the same issue is observed by powering it from Vin. Tried with a 3.3 voltage regulator but even that seems to fail. Right now I’m running out of ideas. Does any of you know what could be…

…the 3 Volt line or something will sizzle and pop, probably the battery, possibly the voltage regulator , maybe both, :shock: ensure you identify the correct pin for the RTC battery. The STM datasheet cal…

…o with interactive control and storage purpose. ILI9341 touch panel controller. 3.3v voltage regulator . PCB adapter for lcd. One Standard SD card socket. Support 16 bit RGB565 format , can connect any 1…

…er!!!) I burnt out a maple mini (not the BAITE version) very quickly (maybe only the voltage regulator , I’ll check this later). Even with the BAITE ones (they have the “bigger” AMS1117 clone voltage reg…

…resistor and U2, but I don’t think this is an adjustment, I think its an alternative voltage regulator Well I guess if the overall voltage changes so does the voltage reference, but its probably easier …

…ould directly accept: a situation that would mandate some voltage regulation (diode, LDO regulator , etc.) to be utilized thus causing wasted battery power due to Vdrop. In the configuration describe…

…rmal 12V would be 19€ Sound good to me, but there could still be changes Made to the Voltage Regulators , which costs, with circuitry, def. about 4€ Drakelive Thu Jan 21, 2016 9:06 am Good job. I’ll buy a…

…re PCBs). I can reflow a few with the passive components, and you are left to solder voltage regulators and MCU, since they are larger they are normally easy to solder with an iron if you have a bit of e…

…e anodes are joined as well, and come out of transistor Q4, which also feeds V-in of voltage regulator U4 (662k – … 6206N3.pdf ) Here is the PCB, and here is my drawing on the datasheet. My really bad d…

…connected to VCC and PA12 (USBDP+) the hole next to C6 is PA12. Has anyone seen that voltage regulator before (U1) ? It seems puny. -rick strawberrymaker Mon May 25, 2015 1:49 pm Oh sorry, Didnt underst…

…ash populated. I tried with a microSD module made for 5V VCC (just bypassing the 3.3 voltage regulator ) and it works. Well I’ll put it on hold for now as i have other issues to address first with the bo…