GitHub - nullstalgia/UARTSwitchCon: ESP32 and Arduino (AVR) compatible, UART controlled Nintendo Switch controller emulators.
5V 12V 24V 8ch RS232 IO Control Switch Relay PLC expansion board DB9 Serial port PC Com Module for Arduino UNO MEGA NANO|Integrated Circuits| - AliExpress
Arduino Switch Controller - finished - R7 WSC's Blog - WSCC - Community Forum