USB CDC Touch Control Relay Board


  • On board 10A 250VAC, 30VDC relay.
  • Based on WCH microcontroller, default flashed USB CDC communication application:
    • Basic demo USB to relay control, send ‘A’ will toggle relay.
    • Baudrate 57600
    • USB send and read to UART1 interface (TX1 / RX1)
  • Lead out all pins from the microcontroller.
  • On board two channels of ADC, voltage divider 10K/4.7K
  • On board four channel touch keys, can be used to controll relay.
    • Touch can be on the PCB direclty or on touch spring.
    • The height of assembled touch srping is still lower than relay
    • If you need presoldered touch srping please leave notes.
    • Breakable touch keys, if not use can just break away.
    • Touch part of functions are not coded in default firmware, please flash other firmware or try edit code by yourself.
  • Demo code for purchased customers, please find in our bitbucket wch_app.

Additional information

Weight 0.03 kg


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