High bright in original Adafruit PiTFT 2.8'


#1

Hello.

There is (will be) some menu to put more bright at original Adafruit PiTFT 2.8’ TouchScreen?

I know: more bright, more power consumption.

In outdoor uses, the screen isn’t enought bright.

Thanks in advance.


#2

AFAIK, Adafruit display backlight is not dimmable in any way. You’ll have to use another display if you need to change brightness.


#3

Thank you.

I will wait for next powerful Zynthian (more Raspb CPU & more screen inches).

At this time I have enought Zyn-games to play.


#4

That’s not completely true, @Axeman
You can regulate to reduce the bright using PWM on GPIO18, but by default in Zynthian it’s at maximum bright.

Regards!


#5

Thank you very much.


#6

You’re right. I remembered that dimming was not possible with PiTFT but then I was using the on-board rPI audio, and with on board audio enabled, GPIO18 loses the PWM capability. This is not a problem with an external audio board.
Unfortunately, this will not help @Mister_Carrington to get more NITs out of the display…


#7

When I shutdown my Zynthian, the PiTFT increases its brightness. Is this strange in any way?

And BTW, I understand is absolutely impossible configure the screen brightness, right?

Regards!


#8

For me with the tft 2,8 “plus” capacitive, screen is at his full brightness at boot, but when the zynthian logo show up, the brightness go down


#9

Probably the bright control for the capacitive version is different from the resistive one. You could take a look to the /zynthian/zynthian-ui/zynthian.sh file and the Adafruit documentation.

Regards!


#10

Hi ! Another question, on this screen there is buttons, one of these do an “enter” when I press it, can I use the others with a mapping for the functions of navigation in the UI ?


#11

Of course, but you would need to hack the code, although it wouldn’t be too difficult. :wink:

Anyway … How is built your Zynthian? If you are using a kit v1, the PiTFT 2.8’ “native” switches are mapped to fixed GPIO pins, and these pins are currently used by the zynthian controllers, so you would need to tweak a little bit. Perhaps the better option is to use the new All-In-One circuit, that will free most of RBPi GPIOs, including those used by the PiTFT 2.8’ switches.

Regards,