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There's a couple cheap STM32 boards out there now, and we also have a few random STM32 based dev boards at the space. Time to dive into that µC series

Blue Pill

The Blue Pill board is a maple mini clone, which costs around 2$ on AliExpress


  • STM32F103C8
  • 72 MHz
  • 64K flash
  • 20K RAM
  • micro-USB
  • 3.3 V
  • many pins 5V tolerant