Data Sheet

Backlight & Touch IRQ

Both the resistive and capacitive versions of this shield have the ability to dim the backlight and get

an interrupt from the resistive or capacitive touch controller chip on-board.

Controlling the Backlight

By default, we assume you'll want the backlight on all the time. However, you may want to PWM

control or otherwise turn off the LED backlight to save power. You can do this with a simple hack.

On the back, look for the backlight jumper.

On the resistive TFT touch shield

Solder the jumper labeled Pin 3. Then you can use Digital 3 to control the backlight.

On the capacitive TFT touch shield

Solder the jumper labeled Pin 5. Then you can use Digital 5 to control the backlight.

Touchscreen Interrupt pin