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[Serial 2] LED or Relay (char) by RobotPlace

Cloned from Sketch [Basic 2] Arduino LED HTTP Simpliest (char) by RobotPlace

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![enter image description here](http://www.robotplace.com/wp-content/uploads/2014/03/example_led_pin7_bb.png "RobotPlace LED example") <br> This code is the simplest way to switch ON/OFF a LED or a Relay on the Arduino by sending a command over serial ("a"=ON, "s"=OFF).

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