Equipment catalog

… on-battery I know the price of Leaf Maple in Seeedstudio is about 45$, not included Li-ion Battery. MapleTree is 39$ with about 3000mA Li-ion Battery, better than Leaf Maple. Leaf Maple VS M…

…e I read many articles about LiFePO4 and I personally would prefer it over all those Li-Ion , because of safety(!) and environmental protection. Sadly there is currently no mass market for it,…

…e that it is F0 Discovery. zmemw16 Sat Oct 29, 2016 11:48 am the vldiscovery f100 is breadboard friendly’ish, you may well need long side-long side joined breadboards and to span double supply ra…

…<Wire.h> // for I2C #define i2caddr 0x50 // device address for left-hand chip on our breadboard byte d=0; // data to store in or read from the EEPROM void setup() { Serial.begin(9600); // Initial…

… However what most people normally use is a Maple Mini or a BluePill, plugged into a breadboard , and then buy individual modules, which also plug into the breadboard. You then just need some of t…

…pad controllers with more than 16 IOs exist as well, e.g. LM8330 – but these are not breadboard -friendly nor easy to solder manually. ag123 Mon May 07, 2018 8:36 am [florisla – Mon May 07, 2018 7…

…gle header, minor snipping on inner pins(?) and twist pins (?) so insert header into breadboard , find a packing piece, align and orientate the module. tack preferably the outer pair. continue as …

… or filtering modes. Temperature compared between the three sensors (all on the same breadboard ): Image Pressure data matches well against my phone (which seems to have a BMP280). My weather stat…

…r does fix its position within a reasonable TTFF (30 seconds) placing it on the same breadboard with a different MCU. Again, it doesn’t seem to be a signal strength issue or sky view, unless the …

…se. The best thing to do is buy separate modules e.g. SD and either use a solderless breadboard for testing, or wire things together using female to female connector wires Image gadget999 Wed Jun…

…gyroscope, and magnetometer data out. Added display functions to allow display to on breadboard monitor. Addition of 9 DoF sensor fusion using open source Madgwick and Mahony filter algorithms. S…

…pm EDIT 2: Well, sticking a 32K crystal on PC14 to PC 15 while the Maple Mini was on breadboard (extra capacitance) produced Time + interrupt counts: 10.457 (10, 0, 1, 1) Time + interrupt counts:…

…ume it’s gapped and insert links across anyway. Smile did you rebuild on a different breadboard or just swap mcu and move some wires ? stephen Jimbo13 Thu Feb 15, 2018 4:40 pm Yes the gap caught …

…w=breakout and if one wants to connect any board to any breakouts, it’s either use a breadboard or ‘dupont wires’, and it forever frees one from the straitjacket notion of shields, shields will f…

…t seems like I damaged my maple mini clone (baite BTE14-07). Monkeying around on the breadboard I’d most likely. When I attach a USB cable the board doesn’t power up. I checked the cable and USB …

…but you can 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 f…

… Mon Oct 31, 2016 12:13 am It seems that there is a node MCU 32 for those who want a breadboard friendly development experience. It ain’t cheap though $24 ish but if you want ahead of the pack an…

…nector which is normally facing down with the headers because it will not fit into a breadboard otherwise! (I did see some folks creatively bent the pins at 90 degrees but that surely puts stress…

…table since the specs are for 3.6V as the upper ceiling for the module. As I am on a breadboard , the interconnects do have some resistance, so the above voltage will need to be adjusted in an act…

…mpaign firebirduino Mon Oct 17, 2016 2:13 am Hi All, Recently I noticed that Arduino breadboards have gained momentum on Kickstarter, several campaigns were all doing very .. The full discussion w…

…16 Mon Dec 14, 2015 12:31 am suffice to say the chance of my getting an open circuit breadboard lead is about the same as a lottery jackpot; but has been known. next q i post ‘has anyone used spi…

…2017 10:07 am rexnanet wrote: Yesterday I’ve been assembling the MCP6S92’s on a tiny breadboard …. rexnanet Thu Feb 09, 2017 10:26 am Yes, usually doesn’t take longer than a week, if I recall. But…

…sing robca Thu Nov 26, 2015 5:01 pm I have a new version of my code that samples all microphones for a a few cycles, calculates the average “noise level” and defines the values to be used for trig…

…d try here before creating a new thread. I’m trying to build a sound locator using 4 microphones . The idea is to monitor 4 microphones for a trigger, once a trigger (any microphone) is above the t…

… wire it (on a maple mini): I2C port 1 gets a mp4725 DAC pin 3: analog input for the microphone pin 4: analog input for a potentiometer that will alter the pitch How it works: I modified the dma …

…can handle multiple I/O streams with SAI. … raries/I2S Works like a charm with a I2S microphone … The SAI peripheral is more complex than the I2S off SPI. It allows more than 2 channels, and diff…

…y because the STM32F4 discovery has this interesting peripherals: – MP45DT02 ST-MEMS- Microphone – Audio-DAC CS43L22 with class D amplifier – 3-Achsen-ST-MEMS-accelerometer and I thought I can eas…

…nswers. The crystals I tried to use didn’t work. I just desolders one from an DS1307 RTC module which I used with an Arduino and it worked immediately. Those are 12.5pF crytals and I attached the…

…RTC library of JChristensen and tested it with a DS3231 AT24C32 IIC module precision Real time clock module memory module Arduino. I only tested the SetSerial.ino example program. The port can be found here:…

…this type of job blah blah blah. But if you just want to code something that turns a heater on if the temperature is too low and a fan on if the temperature is too high etc then it maybe the …

…rly (i.e with new firmware and better electronics). At least the mechanics, e.g. the heaters and heat insulation on the T-962 are not too bad and it generally seems to be able to follow a heat…

…maker Fri Jan 29, 2016 10:45 pm Published the Heatbed PCB, only thing missing is the heater board and then its getting serious Smile But somehow im not really happy with it, it seems still to…

…lace the crystal in thermal contact with the processor, or even add a small resistor heater and an external ntc to keep the crystal within a narrow temperature range. Simply assuming the crys…

…er with 1 extruder and 3 axis. Quick pin count: 4 steppers, 2 pins each, 8 pins. Bed heater and thermistor: 2 pins. (1 ADC + 1 PWM) Extruder heater and thermistor: 2 pins (1 ADC + 1 PWM) SD c…

…1:04 am FSMC – sw is not difficult – just setting a few bits in regs when doing with sram for example. What is difficult is you need ~40wires Smile Pito Thu Nov 24, 2016 10:57 am Here is a …

…MA_SIZE_8BITS, // ​​Destination data size: 1 byte transmitBuffer, // source address: SRAM address DMA_SIZE_8BITS, // ​​Destination data size: 1 byte DMA_MINC_MODE| // flag: cyclic DMA_FROM_…

…u messed the boot0/1 wiring such you set both 1 somehow, you set the start/boot from sram , which is empty after power off/on.. Smile Share on Facebook

…least for a start. And in addition, the boot loader may as well consume (much?) less sram if we do not need the DFU codes. ag123 Wed Nov 30, 2016 5:24 am olimex has apparently succeeded wit…

…G controller with on-chip PHY that supports HNP/SRP/ID with 1.25 Kbytes of dedicated SRAM vs F103: USB 2.0 full-speed interface But I guess the only difference is the OTG feature and as a s…

… the USB and CAN peripherals have their own ram… 0x4000 6400 Shared 512 byte USB/CAN SRAM 0x4000 6000 USB Registers 0x4000 5C00 …………… … this may be what is filling up. mrburnette Sun Aug 09…

Spark Logic archive Fast bitbanding gpio/ sram access arpruss Sat Nov 25, 2017 8:00 pm I made some fast bitband-based gpio preprocessor macros tha…

…e to lose to a useful function. I’ll have to play around with this later and get the SRAM component, but with bootloader 2.0, 20K of SRAM is usually an ample amount even when large demands …

… array? I did it with “xxd -i APP_sketch.bin” during the “execution off the external sram ” exercise Rolling Eyes majenko Sat Dec 08, 2018 1:46 pm It’s a new feature that’s not documented ye…

…Aug 26, 2018 11:57 am That is some serious hardware. Add a QSPI flash, and some QSPI SRAM , and I am pretty sure I could get Linux running on it – then you can use it to host an Arduino buil…

…w, medium-, high- and XL-density devices the USB and CAN share a dedicated 512- byte SRAM memory for data transmission and reception, and so they cannot be used concurrently (the shared SRA…

…n STM32F103 is running at 72MHz and (neglecting optimizations) has 72MIPS and 20K of SRAM , a good design will not go over perhaps 70% of the bandwidth and memory capability. Sometimes, one …

…me the WL. Do not expect writing to an sdcard works similarly as writing to a serial SRAM . A possible solution is to use a FIFO buffer, where you write from a source into the FIFO (when the…

…ost a video webpage but as you mentioned, the frame buffer takes a serious bite from SRAM . The RPi-Zero-W has 512MB of RAM for $5 with a 1GHz clock. If you need 1G of RAM, the RPi 3 is ofte…

…re available. My second First Impression indicates that on uC with a little bit more SRAM , this is a very productive environment. The ecosystem now includes webservers, display drivers, and…

… to try and mix this requirement with program logic. As the STM32 bottom line is 20K SRAM , the effort to integrate SD into the main program logic is more tempting. Ray RogerClark Sun Jun 07…

…s of gpio pins, lots of functionalities on stm32f4 168 mhz stm32f4 processor 192k+4k sram 512k flash hardware fpu, it would likely make a *very fast* 3d printer which could do all those pat…

…,3V 0,25A ozn 662k) U5? U6 GD32F103RBT6 ARM Cortex-M3 3.3V 36-45mA 128KB flash, 20KB sram , usb2.0, can2.0b, case LQFP64 U7 S25FL216KIF pdf (2MB serial flash 3V) Top of the printed circuit b…

…g register where you may adjust the (changing) offset as well. It has got a backuped sram as well (DSxx32). The DS’es 2ppm is for 0-40degC, when using it at ambient temperature (say 23 +/- …

…s has a good number of gpio pins to do all that interfacing and has a good amount of sram and flash to play with. in addition a good number of those f4 boards from ebay has that micro sd ca…

… which I don’t know how to do. I was trying some NPN and PNP transistors, MOSFET and optocouplers . None of it worked for me because they need to be connected with + and gnd but I need to switch on/…

…of those cheap $2 Chinese usb serial boards and a photo-transistor recovered from an opto-isolator . It worked fine until I tried to assemble the whole thing in its completed form. At that point…. no…

…l is to use an audio-fader type of potentiometer to choose door position. RPi has an opto-isolator to the garage door control button. We leave the garage door ajar a foot or two so when the garage i…

…esign and look at those things. BTW. I also had issues with non connected pins on an opto isolator (4N35), as I normally don’t connect pin 6 (Base of the opto transistor), but to stop the error I co…

…impedance one, ie 20mA current loop), good for long distances, usually isolated with opto-couplers . RS485 is low impedance one too. joevpt Fri Sep 23, 2016 6:07 pm Hi All, I finally have this workin…

…rk Sat Jun 13, 2015 1:15 am Interesting Those boards are not quite the same. One has dip switches for Boot 0 and Boot1 rather than the jump links, and the other has the SWD (STLink) connector (pins…

…port • HNP/SNP/IP inside (no need for any external resistor) • For OTG/Host modes, a power switch is needed in case bus-powered devices are connected Share on Facebook

… board” as anything else tends to be unreliable. You also need to make sure the boot jumpers are set correctly. I’ve left the board in my office, but I think this picture shows the correct jum…

… high too. My bluepill doesn’t break this out, so I guess it has to be done over the jumpers . Do you happen to know where can I find the python version? Fotis RogerClark Mon May 22, 2017 10:07…

… to use stflash, and you need to connect the correct pins *and* set the correct BOOT jumpers for this to work. madias Fri Oct 02, 2015 10:16 am This is to so called “blue pill” board. It doesn…

…evice manager – No PORT is being added to the list after I connect it 2 – There is a jumper onboard – and I am not sure what it is – assuming that when it is Boot to GND it works regularly wi…

…Link device. Vassilis Mon Jun 06, 2016 4:53 pm I have the feeling that the SB12-SB15 jumpers should be de-soldered in case you don’t want to break the board in two parts,for isolating the ST-L…

…ially for looking at markings on devices, and for doing inspections e.g. looking for solder bridges etc ahull Mon Oct 17, 2016 11:57 pm I’ve also got one of these…. … Sw~gRV0y~8 …very cheap, and fair…

…ny pills, but looking at the schematic you provide link, yes, there is a 100K on the jumper header, but I don’t see elsewhere where the PB2 can be plug external other from having a wire conne…

…W, there are breadboards which do not have continual GND and VCC rails, you must use jumpers . Just an idea when all is the same but only the breadboards change.. zmemw16 Tue Jun 13, 2017 8:56 …

…identally. You can force the bluepill to work with the stlink by switching the boot0 jumper from the default position of ‘0’ to the boot0 ‘1’. Then press reset so the chip can see the new boo…

…Device 003: ID 1eaf:0004 RogerClark Tue Nov 29, 2016 3:26 am You don’t need to set a jumper or press a button if things are working OK After the compile is finished, Maple upload script gets …

…inal schematic called for a diode, but zero ohm links are cheaper… I would suggest a jumper rather than a link would have been a smarter call. victor_pv Mon May 25, 2015 2:14 pm From the data…

…pm Yes the gap caught me out before but that doesnt seem to be the case here but the jumper leads are very loose in the breadboard so I replaced all and checked voltage at memory board. I did…

…tm32 board using a classical USB to TTL Serial module (remember to set the switch or jumper to 3V3!!) it is more convenient to upload them with direct connection between the olimexino stm32 b…

…sts 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 ‘expensive’ in …

…e a distance from about 2 cm x 4 cm. The 0 to 1 MHz square-signal I haven’t seen (no jumper on board ?). Perhaps you / I have to look in the datasheet. I use the serial port for setting frequ…

…oved. so its worthless, aswell as the additional module (unless you want to use some jumpers ) -The heater/heatbed LED is inversed. So i have to change their connection aswell. -I totally forgo…

…m links. One other possibility is that the black tape might cover some configuration jumper pads used to set the interface mode. Put your multimeter in diode test mode, and probe between the …

…I had to install the zadik usb-libk driver for win64 and I do have to move the BOOT0 jumper to flash code, though. The “sort of” is due to the delay()-based blink rate not being right. It’s t…

…TLINK do like to download vs USB STM DFU mode first setup the Black F407VET6 set the jumper from PA0 to BOOT0 Image Hold the K_UP button and plug the USB cable to PC. (Due to the design, Hold…

… for the user program); two LEDs (one for ‘power on’, one for the user program), and jumpers for Boot0 and Boot1. The schematic can be downloaded from … 07VGT6.png [Thanks to forum user ‘flode…

…shed, only thing missing is adding the Fuse holder and i think that i’ll replace the Buck converter for an ams1117, as the 3.3v arent used for anything more than external interfaces (Bluetooth module…

…3v and it would seem that it is indeed the case. perhaps one way to test is to use a potentiometer / variable resistor to test it Rick Kimball Fri May 26, 2017 2:06 pm If you are talking about the L…

…cted to the axle of the sectional garage door. Goal is to use an audio-fader type of potentiometer to choose door position. RPi has an opto-isolator to the garage door control button. We leave the g…

…t attempt at further protection. I’ve also been looking at playing with programmable potentiometers . I had to purchase some for a project that I assembled. The guy used it to tune a circuit. So it th…

…se an attenuator… a series resistor and a rheostat across the input … technically, a potentiometer would be better so that you can adjust the input voltage and maintain a 600 Ohm impedance to the am…

…1 gets a mp4725 DAC pin 3: analog input for the microphone pin 4: analog input for a potentiometer that will alter the pitch How it works: I modified the dma code of this project to – sample slower …

…ave is how I set the clock 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…

… 8 MHz instead of 72MHz? Can I use 8MHz crystal an reduce frequency in software like fuses on Atmel AVR? Is there any minimal frequency? zoomx Thu Jun 09, 2016 7:27 am I am not sure but I re…

…Let me repeat the meat of the above: LiFePO4 bridging the 3.3V bus… no resistors, no fuses , just the battery looking like a capacitor. I experimented. Here is what I have experimentally conc…

…tware. Input protection in the form of an attenuator, zeners to clamp the voltage, a fuse and perhaps a mov would be the bare minimum, but as I say, I’m open to any ideas. Oh.. and a warm w…

…ng pcb). ~Straw EDIT: Did the Math, still missing thing like Header Pins and the Car Fuse holders (which are hard to find in china as it seems). With a 24V Version, its about 20€, normal 12…

…am” breakout board for ESP32, in addition of USB UART and RST, I would like to see a level shifters for the old 5V world. Are there any recommendations for level shifters for high speed communication…

…m Well, seems like the SD Card Socket has to go onboard. The SDRamps uses a High-Low Level shifter , that seems to require a low-high shifter so it can be used. But I will try it out anyway when mine…

…Did you have to modify the u8glib or the LCD lib to support that display? what about level shifters ? [chrissb – Mon Jul 03, 2017 8:53 am] – Some of the code in the HAL_STM32 folder is unmodified from…

… how those digital weighing scales seem to be doing it so ‘easily’. i’ve heard about piezo -resistive sensors but i’m yet to find common and ‘cheap’ piezo-resistive sensors that can do that. …

… set the brightness of the display from the ESP8266 or control other things like the buzzer (STM also has coded a tone synthesizer that is driven over the same SPI bus), the STM DMA bus also …

…7 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 have Indian Myna birds, in the…

…ect to an amplifier ? stevestrong Wed Nov 01, 2017 9:45 am Currently I have a simple piezo buzzer (without electronics) connected. Yes, the sound is relatively quiet, although the audio wave…

…tsy Wed Dec 07, 2016 12:13 am hias, So ive been playing with Tone a little, i have a piezo on my project now. And i wanted a nice little beep sound for startup and menu button presses… But! …

… provide plenty of sleepless nights thinking about all those lights and readouts and buzzers and blinky stuff. What I should have ended with is a simple rule. Use the appropriate tool for the …

…Guage SPI devices: TOuch panel, TFT panel, SD card. One wire devices: 5xDS18b20 PIR, BUZZER , WS2812b (as a status light). <…> rajdarge Thu Apr 28, 2016 7:28 pm mrburnette wrote:My philosophy …

…ted circuit board From the inner (top) side of the link, there is an 8MHz crystal, a buzzer , a connector for the display. As described, this is a version 4.3. From the top to the right is a J…

…ch has the following working: [*]Thermistors [*]Endstops [*]PWM for heaters / fans / buzzer [*]Stepper drivers via SPI (TMC2660) [*]20×4 Character LCD (RRD Smart Controller) [*]Serial over US…

…l designed or manufactured In addition to the poor build quality, they have a shoddy usb connector and wrong value of USB pullup resistor. I have some GD32 boards which have the same problems (dodgy…

…would be that the ‘maple’ board can be programmed simply through a normal USB cable ( mini usb connector) with the IDE. ‘internally’ the programming is done via DFU (device firmware update) whic…

…the USB pull up resistor) Details of any physical modifications, e.g Put glue on the micro usb connector to prevent it breaking off. Details of which pin the LED is connected to ( if the board h…

…ully ‘programmable’ once you have a bluepill sitting between the ‘dumb’ keys and the usb port , the stm32 can remap any keys and do all sorts of tricks like single key macros and even all sorts …

…nics Joystick in FS Mode RogerClark Mon Nov 28, 2016 8:53 pm @ag123 My board has the USB connector on PA11 and PA12, just like a F103. If I enable Boot0 I get the USB dfu device, so I used the libwd…

…the upload button on arduino IDE and simultaneously I plugged in the bluepill to the usb port . With that trick the bluepill was programed successfully. I am thinking right now one more test to …

… order to “master” the STM32 Smile Also, Regarding it not being recognized by the PC USB port and set with a Port – that could be maybe because it is NOT working the same way we used to work wi…

…). if i cut out the “management” feature of the Due (the 2nd microcontroller and 2nd USB port ) and you flash the STM32 directly (i do that all the time anyway), that gets some of the cost back.…

… additional COM port (USB Serial port) when you connect the bluePill or maple to the USB port ? david.prentice Mon Apr 03, 2017 3:24 pm I edited the C:\Users\David\AppData\Local\Arduino15\packa…

…replace with a solder connection (I don’t have any S4 diodes), but would that put my USB port at risk? If I never use both VIN and USBVCC would I be ok (just living with the risk of damaging my…

…nd look at the serial monitor ? weslleymata Fri Sep 02, 2016 1:35 pm I connected the micro USB cable to the mini Maple plate , now I’m using serial and no more Serial1 , and carrying scketch wit…

… than Leaf Maple. Leaf Maple VS MapleTree 1.Leaf Maple uses USB Mini, MapleTree uses Micro USB which is more convenient. Most of smartphones use micro USB,not mini USB. 2.Leaf Maple uses BQ24010…

…enient to upload them with direct connection between the olimexino stm32 board and a USB port of a computer. To do so it is required a bootloader. Fortunately the great team and individuals STM…

…not see errors when you run the target extended remote. I would also try a different usb port or a shorter cable in this case ag123 Mon Feb 27, 2017 5:59 pm hi roger i got mesmerised by your vi…

…ue. in linux i actually have got this little usb reset utility /* usbreset -- send a USB port reset to a USB device */ #include <stdio.h> #include <unistd.h> #include <fcntl.h> #include <errno.…

…t Python apps. And all the Linux stuff. These RPi have WiFi dongles plugged into 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…

…low level ? I’m glad to be on Linux … My Windows VMs rarely see what I’ve have on my USB ports … Smile RogerClark Thu Sep 10, 2015 7:26 am Yes. MS do appear to be collecting USB data, and there …

…s kinda small, can be swapped out for something else). costs like 30 cents per part. USB port also maybe 10 cents MAX aaand thats it. like 3,50€ (or even just 2€ if its in a bulk, just seeing t…

…’t deal with the 0603 components but think you can take care of the MCU, regulators, usb port if I reflow the 0603 components, say so, and I’ll see how many I can reflow. Bare boards will go fi…

…ady built on an Adafruit Feather M0. Here’s the thing I want to hack.. Note that the mini-USB on the back here is actually for a vehicle OBD connection, and will be expecting +12v as well as K-…

… lost.. I have a TFT (as mentioned earlier) labelled “TFT_320QVT_9341”. It has DB0 – DB-15 . Which lib should I be using, and is it still possible to change the pin config on the STM32F4(Disc…

…facturer of the Si4432 modules uses this 0.049 inch pitch (12 pins). There is also a pin header included, but I haven’t figured out what can be connected to 0.049 inch pitch pin header. Despite o…

…tical to the one in the Maple mini, so you’re paying over twice the price to get the pin headers etc. The problem with shields, is likely to be that they are designed to run on 5V Uno’s and not 3.…

…lity it has to be minimum 100 pins, yes. otherwise you simply can’t populate all the pin headers , which defeats the object of the exercise. Most people seem to like using the BluePill as its cheap…

…t 16 bit RGB565 format , can connect any 16 bit data bus. 2x20 Pin 2.54mm double row pin header interface for connecting MCU. Can be driven by 8051 / AVR / PIC and other low power controllers. Di…

… only slight problem is that the pins on those connector don’t directly fit into the screw terminals on the MAX31855 module boards that I have. Image Strangely, I can get the modules cheaper on eBay t…

… extra power connector for the Heatbed module, everything else can be powered by the pin headers . (normal Stepper Motors shouldnt consume more than 3A anyway, thats just 3 or even 4 rows of pin, n…

…pe, we can make plans to have them manufactured and shipped pre-assembled (W/ or W/O pin headers soldered) directly from China, as this is the only effective distribution channel: for Rpi0W, the m…

… this is interesting. J1 header on the PCB doesn’t go to the flash at all. J1 is a 4 pin header (well, it is after you solder headers in there..) Pin1 = GND Pin2 = Nothing (it would go to collect…

…ed 4 BP’s so far, the RTC has been fine on all of them, but I have been omitting the pin headers on PC14 and PC15 when I assemble. There are some traces you can cut, but it’s not worth the hassle.…

…ere, but I count 79 GPIO channels. The board has two 16×2 = 32 pin and one 12×2 = 24 pin headers , plus two jumpers for selecting the Boot mode with Boot0 and Boot1. Of the 88 header pins, 9 are us…

…the range), so it’s safe to bypass it. Predictably the voltages are a bit lower: the resistor network I used before forced the capacitor to “float” at exactly half of VCC (~1.65V), while the output of …

…d on both (bottom side). Improvement: To replace the L in the +Vref rail with say 1k resistor , and something like LM136-2.5 voltage reference from +Vref against the ground (or against the -Vref…

…y more. It had multiple manufacturing faults, also it seems to be missing a critical resistor pullup which means the USB doesnt work properly, hence the bootloader doesnt always work on this bo…

…e poor build quality, they have a shoddy usb connector and wrong value of USB pullup resistor . I have some GD32 boards which have the same problems (dodgy USB connector) Unfortunately, you get …

…Tue Jun 13, 2017 3:56 pm I wonder if we could at least have them fix the USB pull-up resistor Laughing. RogerClark Tue Jun 13, 2017 9:32 pm SukkoPera wrote:I wonder if we could at least have th…

… it is indeed the case. perhaps one way to test is to use a potentiometer / variable resistor to test it Rick Kimball Fri May 26, 2017 2:06 pm If you are talking about the LQFP48 stm32f103 chip…

…ow operate at 3.3V not 5V, and shields often have 5V to 3.3V converters on them ( or resistor divider networks etc). So some shields could be converted if you are willing to get out your solder…

…er binary Details of any hardware changes that are required (usually the USB pull up resistor ) Details of any physical modifications, e.g Put glue on the micro usb connector to prevent it break…

…812 output is interacting in a weird way with the ADC. To test my theory, I put a 1k resistor between gnd and the mic module out, and another between vcc and out. That actually seems to stabili…

…ll board to buy, because as far as I remember, this board has the correct USB pullup resistor (according to to this post viewtopic.php?p=35228#p35230) Perhaps Robot Dyn could be persuaded to lo…

…ut pins on a single chip by using an I2C GPIO IC. These even have integrated pull-up resistors which the shift registers don’t have. E.g. PCF8575 is available an AliExpress as a breakout board. …

… on an Uno previously. I have just connected the reset pin there high with a pull up resistor but still no joy?! davemorl Thu May 31, 2018 8:51 pm Thank God for that!!! Thanks! After changing t…

… No DTR or any other reset mechanism available. The USB D+ even has built-in pull up resistor . I am imagining that ‘1EAF’ would likely get captured from data stream than ‘@boot’. Maybe I am wro…

…h the blue pill switching from DFU to com port, even though I’ve swapped in the 1.5k resistor and programs run fine, just not the Serial over USB. It has switched to a com port rarely: only twi…

…hemes Smile RogerClark Sat Nov 11, 2017 9:01 pm Thanks for the link. PS. did you use resistors in series with the speakers? stevestrong Sat Nov 11, 2017 9:05 pm nope, the chip is heating up a bi…

…purpose, so I found it doesnt 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 goo…

…se the speaker either directly (for speakers with 8 Ohm or more) or in series with a resistor . I also put an RC filter to input a small amplifier, but as I have no speaker I cannot use it. But …

…side.jpg (253.3 KiB) Viewed 1379 times Slammer Mon Jun 06, 2016 8:45 pm No remove of resistors , no break of board. Just remove the two jumpers on CN2 (see photo). The only problem I had with Nuc…

…onczakp Thu Jul 21, 2016 10:33 am This one Smile Image Edit: should I maybe unsolder Resistor on this pin ? RogerClark Thu Jul 21, 2016 10:54 am The schematic seems to indicate that the jumper …

… diodes from the GPS’s TX/RX pins as they are 5V idle. Put 1k (or 2k2 or 3k3 or 4k7) resistors in series with Tx and Rx: BP TX ——[1k]—— GPS RX BP RX ——[1k]—— GPS TX ilf Tue Jun 13, 2017 3:38 pm …

…ume you are using a red or blue pill stm32f103 board that uses the PA12 1.5k pull up resistor . I’m assuming you are going to program it using an Stlink V2 dongle, either the ebay clone, a real …

…angle and the adjustable desired angle. The 3 phase ac motor will be controlled by 6 relays from the IO pins to enable reverse and forward on the motor. I have no experience with encoders or …

…duino on stm32fx, optional extras’? however you can only blink so many leds, clatter relays , … … at some point a decision to do something more with it will occur or not, not is a loss. i was …

…n. Any idea how to do it? I didn’t try to use ssr but I don’t want to use mechanical relay . ___________+5V USB | pin PB2 ----------------| on / off |__________ +5V TFT stevestrong Mon Oct 03…

…ersion of pascal, or a version/type of shell scripting. Ladder programming, sequence/ relay controls, electrical signal conversion, protocol conversion. Lately I have had to add C & C++ to th…

…-com ok-ic-memory ok-ic-power ok-ic-special ok-ic-stm32 ok-jacks ok-opto ok-power ok- relay ok-switches ok-transformers ok-transistors pololu_a4988 strawberrymaker Mon Feb 29, 2016 2:59 pm Lo…

… release the stepped 48/24v pulses. In the master clocks this was done with cams and relays . I sold the master years ago when I moved. Still have the slave clocks. I rarely run them as they m…

… No luck so far with VLDiscovery. Initially I was able to compile, but could not get LED to blink. But then I updated STM32duino. Now I am not able to compile. Error message: “C:\arduino-1…

… forum calls that board the BluePill, lots of people use them. I think they have the led on pin PC13. I’d recommend you flash the bootloader to your BluePill board, its much easier than ha…

…he BluePill, I’d also tell them to pre-flash the bootloader rather than the flashing LED program they sometimes use, but AFIK the BluePill is made by “VccGnd” and they are only on TaoBao (…

…02, 2015 3:51 pm The board in question is the “Blue Pill” STM32F103C8T6 – it has the LED on PC13 – so you should be able to use the pre-built“generic_boot20_pc13.bin”bootloader. See the Wi…

…via dfu using a USB cable: the usual ‘hello world’ tutorial would be to try to blink leds on the board itself however, should you be starting with a board that do not have the *boot loader*…

…glue on the micro usb connector to prevent it breaking off. Details of which pin the LED is connected to ( if the board has one, or more LEDs connected to GPIO) Details of any other built …

… duty cycle of 0.1% or lower is indistinguishable from dark, even if high brightness LEDs are involved. that percentage is higher for outdoor applications. so if you are refreshing your dis…

…_serial(HID_KEYBOARD); Keyboard.begin(); // useful to detect host capslock state and LEDs delay(1000); } void loop() { Keyboard.println("Hello world"); delay(10000); } taxibunny Wed May 02,…

…same concept as ESP8266/ESP32) Ray /* BlinkNcount_BP3 by m. ray burnette Turns on an LED on for one second, then off for one second, repeatedly. Counts and displays the count on the attach…

… with the ethernet-library ?! Mike. ag123 Sun Jul 29, 2018 5:48 am perhaps blink the led in the main loop every minute or so? if the led blinks but w5500 doesn’t respond it may mean some p…

…of really simple test that writes chars one by one to the USB Serial and flashes the LED each time its written 128 chars, and see if the flash rate suddenly drops off after a certain numbe…

…sed placement new as I have done below, the constructor isn’t called until the first led ().blink() call. Of course there is overhead with this and it uses strange syntax to access the led …

… In order to make it simple, I used the Blink sketch and added WFI when changing the LED state. I expect then the STM32 to enter WFI and stay here until an interrupt is fired (that should …

…2fx. we’re ‘arduino on stm32fx, optional extras’? however you can only blink so many leds , clatter relays, … … at some point a decision to do something more with it will occur or not, not i…

…loaded. RogerClark Fri Jan 08, 2016 8:48 am No ports at all or just DFU? What is the LED doing, i.e blinking ? Did you look in the Windows device manager? mrburnette Fri Jan 08, 2016 1:23 …

… 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 software,…

…n to put on my bike. And at this stage im just getting some basic motor controls and LED updates before I get into doing the MPH and RPM reading calculations done. I’ve modified the steppe…

… Use PNP or P-mosfet. EDIT: Always USE A 100ohm resitor in series with the display’s LEDs . Highsideswitch.JPG Highsideswitch.JPG (13.47 KiB) Viewed 469 times Rick Kimball Mon Oct 03, 2016 8…

…d or powered (except the GPS), This also messes up the GPS but also causes the Power LED of the Blue Pill to start blinking in sync with the LED of the GPS. I’m a bit lost here. I don’t ha…

…y upwards on the top of the board, rather than sticking out from the edge. Also, the LED on one board is connected to PB9 rather than PC13. Also. One board has a SD card slot on the back, …

…t more expensive than single cells of course, but they are might lighter weight than lead acid , and physically smaller for the same or greater Ah capacity. I suspect they will take over from lea…

… display. davemorl Thu Sep 07, 2017 8:22 am Hi Roger, Thanks. I did consider using a touch screen instead of normal switches. I think I’m going to just order some bits and pieces have a bit of a pl…

…roject. I only have maybe 2 encoders to add so that’s 4 more pins and then maybe the touch screen if I can manage to get that working. Do you know off the top of your head what pins I can or can’t …

…ns… I have never actually seen this API used… Consider the following scenario: A TFT touch screen connected to one SPI bus, but with separate CS pins for the display and touch screen controller. 1)…

…. I looked 10 times and didn’t see Sad But thanks Very Happy Here I made the new TFT touch screen example ChrisMicro Fri Jun 22, 2018 8:04 pm Because I had a little time, I made an I2S example. It …

…ne … er-reviews but when looking at the back of the pcb my board uses a TSC2046 as a touch screen controller (but that is for later, first step is to actually being able to display something useful…

…ving some issues using the following libraries to enable my 4D Displays Picaso-based touchscreen LCD displays: … no-Library I can load the libraries without any issue, but as soon as I try the fir…

…:<…> So the current configuration 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). <…> rajd…

…7 6:44 am scrolling to almost the bottom has this text 3.2" inch TFT LCD module with touch screen controller and a SD card cage. It is suitable for embedded systems which require display high quali…

…st ADC DMA captures. If that worked fine, all you would need would be 2 buttons or a touch screen to adjust the capture frequency ahull Thu May 14, 2015 9:58 pm @Victor, if you do get a chance to g…

… documentation and build out a roadmap. I’ve quite a few things planned, including a touch-screen menu and some form of wireless support. Feel free to follow along at the GitHub repo: RogerClark We…

…CH-Lib) and test it with frequency input for DDS AD9851: the first picture shows the Touch Panel for set frequency, the second the selected frequency from AD9851: DLO138-Set-Frequency-AD9851.JPG D…

…iminate the remaining modes by trial and error. I presume the display doesn’t have a touch screen . The button interface should also be relatively easy to figure out with the continuity tester on yo…

…rs 2 CS pins for SPI, for sdcard and a display 1 pin left (could be used as CS for a touch panel in SPI) PB2 and PB8 not used (can be used as outputs once the mcu is booted, so we should be able t…

…y small 30x30mm and it hast 16MB Flash and a IMU. The connectors are made to connect servos so it could be used e.g. for a little robot. RogerClark Sun Jul 23, 2017 7:07 am I agree. Its desig…

…m Hey! Thanks for the input. Smile I don’t think it needs to be that accurate like a servo . As long as it’s within half a degree that will be adequate. Plus with all the gearing and backlash…

… always starts at 1. but I do not see any mistakes. #define IndexMax 3 // Anzahl der servos #define ServoMIN 500 // Minimalwert des Servos in usec #define ServoMAX 2500 // Miaximalwert des Se…

…january core version and leaved the 1.2.0 version. I chosed to use TIM3 for tone and servo but I am not sure that it’s the right choice. Attached there is the folder with all definition and …

…c PWM is analog and quite slow – it used to be 20 ms, but it is still limited by the servo signal definition of 1 – 2 ms. In addition of being fast and accurate, the Dshot has error detectio…

…8 transceiver. It reads the encoder via SPI and sends the information to a dynamixel servo network, using the dynamixel protocol. I have the SWD pins to program it. As I already have the cod…

…ral rivets. You don’t need to know pentle release characteristics for fuel injectors/ servos to get an engine started, bit it will be hard to make a dynamic fine tune without them. Use the ide…

…andardFIrmata: Arduino: 1.6.5 (Mac OS X), Board: "STM32 NUCLEO F401RE" Using library Servo in folder: /Applications/Arduino.app/Contents/Java/libraries/Servo Using library Firmata in folder:…

…as the 3.3v arent used for anything more than external interfaces (Bluetooth module, Servos ). Coming back to the fuses, Im starting to doubt the Use of them. Yeah, its really good to have one…

…c for me (120 times a sec for you) and need to be handles straight away to control a Triac (via opto triac etc) mrburnette Fri Jan 22, 2016 2:07 am RogerClark wrote: Yes. Very cheap for a 80…

…l be through hole as well. I had to make footprints for the connectors and the power triac , as I couldn’t find existing KiCad footprints for the BTA41, and not for the Dimple 40A screw termi…

… set the voltage, or did you modify one? I found a cheap charger, that just uses one zener to set the output voltage, and i have modified several of them to produce different voltages e.g 6v…

…ontrol as well as protection. Better to sacrifice the op-amp than the micro. Putting zener protection after the op-amp as a last attempt at further protection. I’ve also been looking at play…

…8, 2017 4:14 pm i’m postulating about doing some experiments, e.g. get some of these thermistors … r&_sacat=0 stick that with some thermal compound to the sot23 LDOs, then perhaps run some benchma…

…ink i probably posted the data to the forum, but it would be ages ago) I also have a thermocouple thermometer ( but I don’t trust it that much), but I could clip the thermocouple to the top of the …

… to go thru prototype iterations. Then I made a new version with up to 6 steppers, 4 thermistor inputs, 3 high power FETs, 1 lo power fet, 4 endstop/io, 1 ESP8266 port, LCD and SD ports, and some…

…required, as the unit does not have cold junction compensation. Which means that its thermocouple temperature readings, of the 2 x ThermoCouples (TCs) in the oven, will be incorrect if the unit is …

…at it could be possible to make a controller with atleast 3axis, 2 extruder, fans, 2 thermistors and 6 buttons (min, max). And from the sketch size it could also fit marlin onto a maple mini. Only…

…xtruder and 3 axis. Quick pin count: 4 steppers, 2 pins each, 8 pins. Bed heater and thermistor : 2 pins. (1 ADC + 1 PWM) Extruder heater and thermistor: 2 pins (1 ADC + 1 PWM) SD card if needed 4…

…e to handle higher currents than specs suggests. but on top of thermal problems, the MOSFET transistors used in the LDO may have actual electrical limits e.g. the minimum on resistance at the…

…29, 2016 7:08 pm Umm. Very strange. I will try pulling the base of the PNP USB reset transistor , high, and also with it pulled low, to see if that helps. ag123 Tue Nov 29, 2016 10:03 pm i’m not s…

…11:52 pm Nice… but if you want it a little louder, fire the output(s) though a small transistor 2n2222_amp.jpeg 2n2222_amp.jpeg (25.01 KiB) Viewed 987 times stevestrong Sun Nov 12, 2017 2:09 pm T…

…Im powering the piezo at 12v and triggered from the maple mini via a standard 2n4001 transistor . Going by the specs 12V should be fine. I think it said 3-20v or something like that. At this stage…

…t. And now the hard part which I don’t know how to do. I was trying some NPN and PNP transistors , MOSFET and optocouplers. None of it worked for me because they need to be connected with + and gnd…

…ning two timers on separate pins but that would consume two pins and needs two extra transistors on the outside for F103.type boards which is probably what the majority of hobby bobs are using. bu…

…, and then MacroAssembly 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 …

…osondes for parts! Often, it was far less expensive to just go out and buy a cheap 6 transistor radio and gut it for parts. Remember those days? For all of the makers out there, I think you need …

…ed it was worth trying applying 5V to VIN. Frankly I don’t quite understand the dual- transistor circuit connected to PB9, so tried VIN first, which worked. Everything seemed to be functioning, I …

… for my multimeter, from one of those cheap $2 Chinese usb serial boards and a photo- transistor recovered from an opto-isolator. It worked fine until I tried to assemble the whole thing in its co…

…rom one of those ferrite filters on power and USB cords wold do as the core. Sensor ( transistor sized) in the gap of the core. With enough turns in the core, I read you can get down to 100mA sens…

…nication? Cheers, Ollie martinayotte Mon Apr 18, 2016 5:03 pm Simply use traditional MOSFET method : Image mrburnette Mon Apr 18, 2016 5:43 pm Ollie wrote:If there could be a “dream” breakout…

…ce those pololu steper motor modules i think for stm8s, it would be necessary to use mosfet transistors or bipolar transistors to drive stepper motors if that’s needed, that would mean additi…

… 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 with multi meter board… ahull Mon Feb 19, 2018 4:35 pm You might find this us…

… the display at full brightness, you may (depending on your LCD board) need to add a transistor to drive the backlight. ahull Thu Mar 24, 2016 4:41 pm rexnanet wrote:ahull wrote: No, the ADC on m…

…lers which also use 3.3V electronics. The big discussion is rather about driving the MOSFETs with only 3.3V. But if you’re going to design a new board, it’s easy to add an additional transisto…

…which we need to identify the pin(s). It is probably driven via PWM and one of those transistors . This is probably the first thing we need to identify as reading the display is going to be pretty …

…hot end 1 analog pin – bed (for heated bed) 1 analog pin – for hot end2 (optional) – mosfet – 1 pin for mosfet hotend (the heating element) – 1 pin for mosfet hotend (the heating element – ho…

…h a pot, thanks for the advice. @Madias, I don’t have any opamp at hand. I have some transistors , and 2 of the PAM boards, so I though it would be easier and quicker to use the PAM, at the end of …

…d Aug 16, 2017 6:35 am Hello, Yes I think it’s right. But on mine I don’t have the 2 transistors ! zmemw16 Wed Aug 16, 2017 3:31 pm i’ve seen smd packages with complementary transistors in them. sr…

… 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 effect sensor, but the only ones …

…ic-power ok-ic-special ok-ic-stm32 ok-jacks ok-opto ok-power ok-relay ok-switches ok- transformers ok-transistors pololu_a4988 strawberrymaker Mon Feb 29, 2016 2:59 pm Looks like i forgot to remove …

…0A at 12V ) If you need low voltage but lots of current, it is possible to modify an transformer by removing the secondary coil, and replacing the winding with a few turns of very thick wire. Also…

…m. b6/b7 to chip & 4k7’s come as 4k67 to 3v3 pin; i’ll live with 0.64% low Smile the spi flash is definitely marked as a Winbond 25X40BVN1G data sheet says Atmel AT24C08C, 8K Serial EEPROM: Inte…

Spark Logic archive Blue pill reading Winbond 25Q80 SPI flash Jimbo13 Sun Feb 11, 2018 5:23 pm I have tried without success to use the FlashDiagnostics example f…

…0 pm BTW, I’ve used this library in the past to access different flavours of WinBond SPI Flash : zmemw16 Fri Sep 02, 2016 7:06 pm ahull wrote:The story is staring to get pretty interesting. Imag…

…4cxx on it or there is another variant with one and sdcard, might even be one with a spi flash on it as well. look for a zet version as well lcd might be interesting as from its pin labelling it…

…d be able to have a look at this tonight! Just trying again with my SP8a to read the SPI flash . You’re right that the clamp thing is no good, but (according to the foreign blog post), the SPI pi…

…V 4 Buttons VET, 2 Buttons VGT VET with additional features: TF SD(IO!) card holder, SPI flash , backup battery… Form factor: The VGT board seems to be very slim smaller LDO on the VGT? (I can’t …

…new (faster) version of SDIO from Victor ( … 2/pull/474) – check the on-board W25Q64 SPI flash , maybe add SPIflash lib to repo (where from?) – check/add FPU ( … 048#p31040) – add support for See…

…lication for F4 which would involve I2C. My priorities include the black F4 on-board SPI flash . Then I intend to test the blue F4 board. I think that board includes an I2C flash chip, so this wi…

… SD_CS). If I’m not mistaken, F_CS should be left unconnected as I don’t have the U3 SPI flash populated. I tried with a microSD module made for 5V VCC (just bypassing the 3.3 voltage regulator)…

…cript that goes with a device, I suppose. I hacked earlier SPIFFS to work with WDxxx SPI flash memories on stm32duino. It works but the code is a bit *couch* sketchy. It’s really not a fast fs b…

…ocessor. It runs the USB mass storage support code, and it uses FATFS and a smallish SPI flash chip. So a drag and drop actually causes the 2nd microprocessor to take the new file and store it i…

…ay take as many as 8 pins for a 4×4 keypad i’ve read somewhere that stm8s makes good stepper motor controllers too, just that i’m not too sure if they would ‘conveniently’ replace those pololu stepe…

…r for the Heatbed module, everything else can be powered by the pin headers. (normal Stepper Motors shouldnt consume more than 3A anyway, thats just 3 or even 4 rows of pin, not that much space is co…

…le. Do you envisage this being doable with say a bluepill or MM, a hand full of ebay stepper motors and stepper driver boards? victor_pv Thu Jun 29, 2017 6:45 pm [ahull – Thu Jun 29, 2017 4:45 pm] – …

…ins etc has been mapped). VET is a 100 pin package, how many pins do you use on each stepper motor . I usually only use 2 pins per stepper (dir and step) some people also use another pin for EN (only…

…unds like a good idea to put it into the library. I will try to test it later with a DC motor and encoder. At first look, I see that you named it Encoder.h so it may be a bit misleading with PJ…