Raspberry Pi Relay module via GPIO - Raspberry Pi Automation

Raspberry Pi - 4-Channel Relay Module

Industrial Raspberry Pi I/O module (PLC), CE/FCC/IC compliant, with wide-range power supply, RTC, digital and analog inputs, power relays, open

Iono Pi

wiring - Controlling Switches from both Raspberry Pi relay & Manual [Home Automation] - Raspberry Pi Stack Exchange

Control Up To 65,280 Relays With Your Raspberry Pi!

OpenPLC on a Raspberry Pi – Fun Tech Projects

Enable Raspberry Pi to control AC and DC loads for IoT, Home, Industrial and Building Automation. Stackable to eight layers, the card can be expanded

Eight RELAYS 8-Layer Stackable HAT for Raspberry Pi

How to control relays with a raspberry pi - Quora

Waveshare Raspberry Pi Relay Board - ElectroPeak

RASPBERRY PI – All About controlling Relay Boards for Home Automation

Raspberry Pi Wifi enabled 4-way power box

Building a Smart Central Heating System with a Raspberry Pi, and Python, by Michael Jarvis

2CH Relay Home Automation HAT for Raspberry Pi – Oz Robotics

Raspberry Pi Relay module via GPIO - Raspberry Pi Automation

Control electronics using a relay