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8 relay module1/1/2023 ![]() Improper or incorrect use could result in serious injury or death. Warning: This board interacts with HIGH AC voltage. NO terminal is normally open, unless you activate the relay that connects it to the COM terminal. NC terminal is normally connected to the COM terminal, unless you activate the relay, which breaks the connection. Output Terminals:ĬOM terminal connects to the device you intend to control. Keep this pin disconnected if you remove the jumper. VCC pin is shorted to the JD-VCC pin with the jumper cap on. Without the jumper cap, you’d have to connect it to a separate 5V power source. When the jumper is in place, JD-VCC is shorted to VCC, allowing the electromagnets to be powered by the Arduino’s 5V line. ![]() ![]() ![]() JD-VCC provides power to the relay’s electromagnet. These are active low pins, which means that pulling them LOW activates the relay and pulling them HIGH deactivates it. VCC pin provides power to the built-in optocouplers and, optionally, the relay’s electromagnet (if you keep the jumper in place). ![]()
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