Relaismodul 4 Kanal 5V für Arduino Raspberry Pi ESP8266 ESP32 Optokoppler
4-Channel 5V Relay Module — Optocoupler Isolated — Arduino / ESP32 / Raspberry Pi. Wiring Diagrams (ESP32 & Arduino). Below are two wiring diagrams showing how to connect the relay module to an ESP32 and to an Arduino Uno.