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Internet of things : open source home automation project using arduino
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Arduino & Relay Wiring Diagram
![Arduino Relay Module Connection Tutorial](https://i2.wp.com/mechatrofice.com/wp-content/uploads/2017/08/arduino-relay-interface-schematics-circuit.png)
Arduino Relay Module Connection Tutorial
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Control Up to 65,280 Relays with Your Arduino! - Hackster.io
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2_Channel_Relay_Board_SCHEMATIC - Electronics-Lab.com
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2 Channel 5V Relay Module - Wiki
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How to control optocoupler and relay by using microcontroller
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Arduino 4 relay module
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5 Volt 4 Channel Arduino Relay Module example - Arduino Learning