Example #4: Backlight Control
The TFT Touch Shield's backlight is on by default since its control circuit is directly powered by the 5V pin. If however, you wish to control the backlight's on/off state using the Arduino Digital I/O pin 7, a simple modification will have to be made:
Note: Please read ALL of the following steps first before performing any action.
1. Find the backlight's three terminals location (ON, BACKLIGHT, D7) in the back/bottom side of the shield (see figure below).