Amazon.com: GeeekPi Raspberry Pi Expansion Board 4 Channel Relay Board Module Power Relay Module for Raspberry Pi 4B & Raspberry Pi 3 Model B+ & Raspberry Pi 3/2 Model B (No Programming
Raspberry Pi: Control Relay switch via GPIO
Raspberry gPIo - SparkFun Learn
Raspberry Pi Pico Relay Board Botland - Robotic Shop
Control Up To 65,280 Relays With Your Raspberry Pi! - Hackster.io
RPi PoE Relay Board Module for Raspberry Pi 3B+ 4B 6954525591519 | eBay