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4 channel relay module interfacing with arduino uno tutorial part 2 in
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4 channel relay module interfacing with Arduino Uno Tutorial part 2 in

Relay Module Connection in Arduino: Code and Wiring Diagram

Control 12V Lamp via SMS with Arduino | Random Nerd Tutorials
Arduino & Relay Wiring Diagram

Utilisation d'un module relais multicanal avec Arduino • AranaCorp

Basic setup for Arduino with Relay - Hackster.io