backside jumper setup

please refer to the image below

  • top-left capacitor for genesis arduino
  • network resistor for genesis arduino
  • pullup resistors in the middle for I2C
  • power supply selector by 3-way SMD jumper


  • Crystal no placed default, the MCU can use internal clock for most cases.
  • Default power selection by 3-way jumper on board, default on 5V.

  • Will build next version TQFP-48 footprint IC, nearly same cost but more functions.