From ElectroDragon Wiki

SCH and Board Functions

  • Power Select - select chip power supply and output either 5V or 3V3
  • UART | Other Switch - switch either uart output or any other (IIC SPI Parallel, etc) interface


  • Power LED
  • RDY LED - serial ready LED
  • TNOW LED - serial sending status LED

Side Pin header

  • UART
  • IIC
  • SPI (CS0 CS1)

All the rest pins are lead out on chips side