4チャンネル 5V リレーシールドモジュール

Excellent quality

This is exactly what I wanted. Simple low voltage control for 4 standard 110V outlets (of course light duty use only). Direct control by parallel port data pins on old PC.

I bought one of these for use with an Arduino Uno, to switch various model railroad-related loads. So far so good!

I use this relay board because, the power required to activate relays is supplied by external power supply. I want to minimise the current load on the raspberry. I needed DPDT relays so i used two in parallele Very fast delivry

Excellant quality product with creepage slots and opto-isolated inputs. Far better tahn the cheepies direct ordered. RobotShop is #1. AND when they say you will have it in 3 days--that's when you get it! Thanx RobotShop!