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The 16 relay module and the Raspberry Pi: not an ideal marriage – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
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3 Channel Relay Expansion Board For Raspberry Pi 4b 3b+ 3b 3 Way Relay Controls Module Breakout Shield Hat For Home Automation - Demo Board Accessories - AliExpress
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Raspberry Pi 4 Model B 8-channel Relay Expansion Board 40pin Gpio Header Power Relay Board For Raspberry Pi 4b/3 Model B+/3b - Demo Board Accessories - AliExpress
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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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