MCUfriend 2.8 TFTLCD shield - how to control backlight ???

Other Hardware Displays
1

Hello all,

please I have bought this part from DealExtreme : http://www.dx.com/p/2-8-lcd-touch-shield-module-for-arduino-leaf-maple-raspberry-pi-blue-318034

It runs on the mega as a ILI9341 with Adafruit TFTLCD library.
Everything running good, but ..... I would like to use a backlight On/Off (or dimmer) ... if is possible.

Please, give some ideas .. if is possible with this library, but ... also possibility to install additional transistor and so on.
I have searched web for pinout, but I am not succesfull.

Thanks a lot for any help.

Bobo

2

Hi, I have a display that looks the same.

The backlight source is a set of white LEDs, unfortunately these are wired to the 5V supply rail on the shield board, thus you would have to hack the board to access the LED connections directly. This would be possible but you may damage it unless you are a skilled hacker. You would also need a transistor buffer as typically the LEDs need at least 50mA which is beyond the rating of the Arduino I/O pins.

3

Hi rowboteer,

thanks a lot for all infos. But I don't know where is the supply line. I couldn't find any material (circuit diagrams) about this MCUfriend product.
Any experiments are not able too, due to only one piece of module, what I have.

Bobo

4

Bobo:
Any experiments are not able too, due to only one piece of module, what I have.

OK. Unfortunately that display is not designed to permit control of the backlight brightness, so you are stuck with a fixed level.