user31999: can anyone give me an advice on connecting an 10W led + 12 volt drive to an Arduino Uno? it works without the board but when i tried to connect to Uno it doesn't work anymore. Thankyou

user313: You'll need a switch such as a transistor, and capable of handling 10W, to be driven by the Arduino and connect/disconnect the LED to an external 12v supply. There are many examples on the web. Remember to connect the 12v and 5v grounds together.

user29436: To operate LED using Arduino you will need a switch that can be operated using electronic switch like transistor, Mosfet or Relay board.
More easy and reliable option would be using Relay Board.
You can visit this link and can get more idea....
http://www.electroschematics.com/8975/arduino-control-relay/

31999: <p>can anyone give me an advice on connecting an 10W led + 12 volt drive to an Arduino Uno? it works without the board but when i tried to connect to Uno it doesn't work anymore. Thankyou</p>
 313: <p>You'll need a switch such as a transistor, and capable of handling 10W, to be driven by the Arduino and connect/disconnect the LED to an external 12v supply. There are many examples on the web. Remember to connect the 12v and 5v grounds together.</p>
 29436: <p>To operate LED using Arduino you will need a switch that can be operated using electronic switch like transistor, Mosfet or Relay board.
More easy and reliable option would be using Relay Board.</p>

<p>You can visit this link and can get more idea....</p>

<p><a href="http://www.electroschematics.com/8975/arduino-control-relay/" rel="nofollow noreferrer">http://www.electroschematics.com/8975/arduino-control-relay/</a></p>
