Description Application: 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) Board Features: Relay Control: On board 10A 250VAC, 30VDC relay. Lead out all pins from the microcontroller WCH CH554. ADC: On board two channels of ADC, voltage divider 10K/4.7K Programmable LED: P1.4, solder the front PCB solder to connect them first Type-C: Tested default firmware, output detecting message via uart. Disconnect front P1.4 jumper and connect back jumper to use. Support USB programming or any other USB functions. Touch key functions: On board four channel touch keys, can be programmed to control relay. User can touch PCB directly or touch on touch-spring. Breakable touch keys, if not use can just break away. Touch part of functions are not coded in default firmware, Package includes four spring-touch: The height of assembled touch spring is still lower than relay If you need pre-soldered touch spring please leave notes. All documentation please find at the portal wiki here. WCH CH55x Series: CH551 CH552 and CH554 CH559 USB CDC Touch Relay Control Board CH554
