The STM32 “Blue Pill” is a development board based on the STM32F103C8T6 micro-controller from STMicroelectronics. It has the following characteristics:
- 72Mhz ARM 32-bit M3 CPU Core
- 64 kb of flash
- 20 kb of RAM
- Lots of peripherals (2 I2C, 3 USART, 2 SPI, 1 CAN and even a USB 2.0!)
- 3V3 logic
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