04. Communication > ReadASCIIString https://www.arduino.cc/en/Tutorial/ReadASCIIString Example 4G The code provided is wrong and is made for a common cathode RGB LED. The kit includes a common anode RGB LED. The code should be changed from: red = 255 - constrain(red, 0, 255); green = 255 - constrain(green, 0, 255); blue = 255 - constrain(blue, 0, 255); to: red = 0 - constrain(red, 0, 255); green = 0 - constrain(green, 0, 255); blue = 0 - constrain(blue, 0, 255); 06. Sensors > Knock https://www.arduino.