Review on 🔌 GeeekPi Raspberry Pi Expansion Board 4 Channel Relay Board - Power Relay for Raspberry Pi 4B, 3B+, 3/2B (No Programming/Programmable) by Thong Pilla

I'm using this board to control four 24VAC irrigation valves with a Raspberry Pi 3 B+ to fill a 2000 gallon tank (not overflow) and control the filter backwash when the pressure drops downwards. (controlled by pressure sensors and ADC). I really like that this board uses I2C to communicate with the Pi. Several of these boards can easily be stacked on top of each other to provide additional relay channels. It has a good end-to-end header so you can still attack other devices and sensors. In the end it works great. I highly recommend this board for applications where you don't need more than three amplifiers per channel.