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PiRelay Power Relay Module for Raspberry Pi, 4 Channel Relay Shield for Raspberry Pi, Relay HAT Expansion Relay Board for Raspberry Pi 4B/3B+/3B/2B/B+/A+ : Amazon.co.uk: Computers & Accessories
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wiring - Controlling Switches from both Raspberry Pi relay & Manual [Home Automation] - Raspberry Pi Stack Exchange
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GPIO relay signal cross turns to all relays staying on after Darlington added - Raspberry Pi Stack Exchange
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