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The Raspberry Pi Hobbyist: GPIO Output Relay Interface
![wiring - Controlling Switches from both Raspberry Pi relay & Manual [Home Automation] - Raspberry Pi Stack Exchange](https://i.stack.imgur.com/cjDmA.png "wiring - Controlling Switches from both Raspberry Pi relay & Manual [Home Automation] - Raspberry Pi Stack Exchange")
wiring - Controlling Switches from both Raspberry Pi relay & Manual [Home Automation] - Raspberry Pi Stack Exchange
Raspberry Pi GPIO: Driving a Relay using a Transistor
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Control Up To 65,280 Relays With Your Raspberry Pi! - Hackster.io
Raspberry pi Control Solid State & Mechanical Relay with Google Mini | Tutorial # 17 - YouTube
