Spark Logic

Black Pill connection guide

Black Pill WeAct MiniF4 V3.1 wiring guide with power, signal assignments, and bench checks.

STM32F103C8T6 Black Pill 43 contacts

WeAct MiniF4 V3.1

44 contacts Current package

STM32 development boards · WeAct documents the same side-header and SWD pin definitions for V3.0 and V3.1. The map covers those headers on V3.1. See the WeAct schematic for USB-C and the optional flash device.

Power the board from USB

Required

Use a single USB cable to power the board through its native connector. Leave external power headers disconnected. Check the 3.3 V rail before attaching the debug probe.

  • USB power input
    • USB host VBUS
    • Board USB-C VBUS
  • USB return
    • USB host ground
    • Board USB-C ground
  • Board logic rail

Bench checks

  • Identify the USB power input and ground in the board schematic.
  • Measure roughly 3.3 V between the board logic rail and ground. Check for a short or wrong connector if the rail is low.

WeAct MiniF4 V3.1 connector map

Connection scenarios

Connect a 3.3 V UART console

Use an external 3.3 V logic-level adapter and keep the board on USB power. Cross transmit and receive, share ground and match the serial framing.

Bench checks

  • Leave the adapter’s supply output disconnected.
  • Enable USART1 on PA9/PA10 and verify that the host receives a known test string.

WeAct MiniF4 V3.1 connector map

WeAct MiniF4 V3.1 wiring map

Highlighted contacts are used in the required step or selected circuit. Select a contact to inspect it.

Header 1
Use the board connector marking and locate contact 1 before wiring.
Header 2
Use the board connector marking and locate contact 1 before wiring.
SWD header
Use the board connector marking and locate contact 1 before wiring.
Selected pin details

H2-6 · A9

Configurable I/O · GPIO

Routes to MCU PA9. Choose the applicable GPIO or peripheral function in the MCU documentation.

WeAct MiniF4 V3.1 connector map

Electrical limits · Pin in the reference

Models and documents

The maps follow the listed PCB variants. Match the board markings and connector positions to the referenced schematic before applying power.

WeAct MiniF4 V3.1
WeAct documents the same side-header and SWD pin definitions for V3.0 and V3.1. The map covers those headers on V3.1. See the WeAct schematic for USB-C and the optional flash device.