STM32F103C8T6 bluepill

STM32 Blue Pill is a high-performance, breadboard friendly development board with loads of features in a small form factor. It features a 32-bit ARM Cortex M3 processor running at 72MHz frequency with 64Kbytes of flash memory and 20 Kbytes of SRAM. It has an extensive range of I/O and peripherals, including multi-channel Direct Memory Access, several high resolution ADC, and three general purpose 16-bit timers plus one PWM timer. It also has multiple communication interfaces including two I2Cs and SPIs, three UARTs, an USB and a CAN. Further, it allows you to add additional flash by soldering an SPI Flash to the board.

This development board is pre-flashed with an Arduino bootloader, so you can download the sketch just like other Arduino board.

The STM32 Blue Pill can be programmed using either the Type-C USB connector (if bootloader is flashed), the STLink USB dongle, or an external USB to 3.3V TTL adapter.

A set of 2.5mm pitch male headers is included (soldering is required).

Check out the following tutorial for detailed instructions on how to program the STM32 Blue Pill with Arduino IDE:
Program STM32 Blue Pill (STM32F103C8T6) with Arduino IDE

Note: This board does not support microPython. Not all I/O pins are 5V tolerant – refer to the pinout diagram for details.

Features:

• STM32F103C8T6, 72 MHz ARM Cortex-M3
• 64K Flash, 20K SRAM.
• 32.768KHz crystal for RTC
• 3 buttons: user, boot and reset
• USB type-c connector
• 32 digital I/O Pins (12 of which are PWM)
• 14 Analog Inputs
• 3 UART Ports
• 2 I2C Ports
• 2 SPI Ports

Document

• Datasheet
• Schematic
• Pinout diagram

Dimensions: 53mmx 20.8mm