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Microcontroller
WeAct Black Pill (STM32F411CE)
The popular successor to the Blue Pill with a Cortex-M4F, USB-C, and a user key, widely used for keyboards (QMK), flight controllers, and STM32 learning.
Processor
STM32F411CEU6 Arm Cortex-M4F @ 100 MHz
Logic
3.3 V GPIO (many pins 5 V tolerant)
Power
USB-C, 5 V pin, or 3.3 V pin
Format
Breadboard DIP-style board, dual pin rows
Check before wiring
- Multiple board revisions (v2.0/v3.0/v3.1) differ in pinout details and components; match the schematic to your revision.
- Clones of this board exist with different regulators and crystals.
- Hold BOOT0 at reset for DFU; a floating BOOT0 can cause intermittent boot issues.
Interfaces
GPIOI2CSPIUARTADCPWMUSBSWD
Source-backed connector
Interactive pin map
Pin map
Connector
Black Pill 2x20 pin headers
USB at top, component side up, 2x20 headers on both edges
Simplified technical illustration. Pin data is source-backed; verify against the linked documentation before wiring.
Hover, tap, or focus a pad to inspect a pin. Use arrow keys to move between pins.
- Silkscreen labels for the WeAct Black Pill V2.0 (STM32F411CE); USB-C at the top, board component-side up.
- STM32F411 IO is 3.3 V; most PA8-PA15 and PB3-PB15 are 5 V tolerant. PA0-PA7, PB0/PB1 and PC13-PC15 are NOT 5 V tolerant.
- Onboard KEY button is on PA0, user LED on PC13; SWD on PA13 (SWDIO) / PA14 (SWCLK); USB on PA11 (D-) / PA12 (D+).
All 40 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | Power | VBAT | ||
| 2 | GPIO | LED · Onboard LED (active low). | ||
| 3 | GPIO | OSC32_IN | ||
| 4 | GPIO | OSC32_OUT | ||
| 5 | GPIO | KEY / WKUP · Onboard KEY button (active low). | ||
| 6 | ADC | ADC1 | ||
| 7 | UART | UART | USART2_TX / ADC2 | |
| 8 | UART | UART | USART2_RX / ADC3 | |
| 9 | SPI | SPI | SPI1_NSS / ADC4 | |
| 10 | SPI | SPI | SPI1_SCK / ADC5 | |
| 11 | SPI | SPI | SPI1_MISO / ADC6 | |
| 12 | SPI | SPI | SPI1_MOSI / ADC7 | |
| 13 | ADC | ADC8 | ||
| 14 | ADC | ADC9 | ||
| 15 | System | BOOT1 | ||
| 16 | I2C | I2C | I2C2_SCL / SPI2_SCK | |
| 17 | System | NRST | ||
| 18 | Power | 3V3 | ||
| 19 | Ground | GND | ||
| 20 | Power | 5V | ||
| 40 | Power | 3V3 | ||
| 39 | Ground | GND | ||
| 38 | Power | 5V | ||
| 37 | I2C | I2C | I2C1_SDA | |
| 36 | I2C | I2C | I2C1_SCL | |
| 35 | I2C | I2C | I2C1_SDA | |
| 34 | I2C | I2C | I2C1_SCL | |
| 33 | SPI | SPI | SPI3_MOSI | |
| 32 | SPI | SPI | SPI3_MISO | |
| 31 | SPI | SPI | SPI3_SCK | |
| 30 | SPI | SPI | SPI1_NSS | |
| 29 | Alt | USB_D+ · Shared with USB D+. | ||
| 28 | Alt | USB_D- · Shared with USB D-. | ||
| 27 | UART | UART | USART1_RX | |
| 26 | UART | UART | USART1_TX | |
| 25 | GPIO | TIM1_CH1 | ||
| 24 | SPI | SPI | SPI2_MOSI | |
| 23 | SPI | SPI | SPI2_MISO | |
| 22 | SPI | SPI | SPI2_SCK | |
| 21 | SPI | SPI | SPI2_NSS |
Why it matters
- Vendor GitHub repo publishes schematics and pin diagrams per board revision.
- DFU bootloader via BOOT0 button allows flashing without a programmer.
- Optional SPI flash footprint on the underside for extra storage.
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