IMPORTANT: Install the following sketch on your Arduino to use AutoArduino: https://github.com/joaomgcd/AutoArduino-Sketch/blob/master/pins.ino
Import the attached project, then connect your RGB LED to your Arduino:
- R to pin 9
- G to pin 10
- B to pin 11
In Tasker run the Show RGB screen to show the scene and control the LED

Control RGB LED 1.0
Enable and disable R, G and B components of a LED