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DC 5V 9V 12V 24V Optocoupler isolation H/L Level Trigger 1-Channel
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Control 12v lamp via sms with arduino .
DC 5V 9V 12V 24V Optocoupler isolation H/L Level Trigger 1-Channel
How to Set Up a 5V Relay on the Arduino - Circuit Basics
KY-019 5V Relay Module - ArduinoModulesInfo
Arduino Relay Wiring Diagram | Online Wiring Diagram
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