Is it possible to dim the display?
osos opened this issue · 6 comments
I notice in your setup you have connected the LED-pin from the display to the Wemos D1 mini.
Can it sustain the power?
Can it be used to turn the backlight on/off?
Can it be used to dim the backlight? e.g. PWM output?
I know the ili9341 is capable, but it somehow depends on the wiring of the chip.
Some ILI9341 based boards have an onboard transistor to switch the LED current, others have the LED exposed with either no series R or a very low value one.
If you have a display with a transistor, then the LED brightness can be PWM controlled.
Thanks. But how do i recognize which kind. I am not a that much into electronics.
@osos Have you bought a display yet? If so can you post a picture of the back on the board?
It is identical with this one: http://www.ebay.com/itm/2-4-SPI-TFT-LCD-Touch-Panel-Serial-Port-Module-with-PBC-ILI9341-3-3V-240x320-/112014412654
OK, make a visual check and compare with this picture from the ebay link you provided with your actual board. I have drawn an arrow on the picture that points to the LED transistor Q1. Note that sometimes ebay pictures show images of one board and supply a lightly different one, hence the suggestion of a detailed look at the board you have.
The presence of that transistor means you can turn on off or PWM the backlight LED using a digital pin from your processor board.