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DC 5V 9V 12V 24V Optocoupler isolation H/L Level Trigger 1-Channel
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Arduino & relay wiring diagram .

Arduino & Relay Wiring Diagram

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DC 5V 9V 12V 24V Optocoupler isolation H/L Level Trigger 1-Channel

KY-019 5V Relay Module - ArduinoModulesInfo