After this tedious step, he designed a PCB that hosts an Arduino Nano to accept input, two MCP23017 GPIO expanders to give it enough outputs, and CD4066BE CMOS switches to trigger the connections.

MySondy GO LoRa32 is an ESP32-PICO-D4 board with a 433 MHz LoRa module and a 0.96-inch OLED designed to track ...