STM32F103 blue pill development board

There are many boards featuring the STM32F103. The “blue pill” is probably the cheapest one of them.


  • STM32F103C8T6 in LQFP48 package (probably not)
  • ARM® 32-bit Cortex®-M3 CPU
  • CPU frequency: 72 MHz (max)
  • Flash: 64 KB
  • SRAM: 20 KB


Fake chips

Although the chip on your blue pill board is labeled STM32F103, it is almost certainly not a genuine STM32 chips. It will probably be a Chinese clone rebranded as STM32:

(STMF103 id: 0x1ba01477 / CS32F103 id: 0x2ba01477)