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RA8875 Touch help
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RA8875 Touch help

by keaster20 on Sun May 22, 2022 8:26 am

I'm having a bit of trouble with the touch on a 7" display using a Adafruit RA8875 controller board, the unfortunate thing is that the display is an eBay 7" 40 pin TFT. The display part works great its the touch I'm having problems with. Doesn't matter how fast I touch or what I use, a finger or stylus I always get 4 touch point data. The other strange thing is that the 1st 2 are very close to each other and the last 2 are way off from the 1st

This is the serial output from touching the top left corner
Got Touch
51 , 60
Got Touch
51 , 61
Got Touch
457 , 152
Got Touch
563 , 87

Is this a compatibly issue and can it be fixed?

keaster20
 
Posts: 1
Joined: Sun May 22, 2022 8:17 am

Re: RA8875 Touch help

by adafruit_support_mike on Sun May 22, 2022 7:10 pm

Without a datasheet there's no way to say for sure.

Try getting readings for a grid of points across the surface and see if you can find any patterns in the results.

adafruit_support_mike
 
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Joined: Thu Feb 11, 2010 2:51 pm

Please be positive and constructive with your questions and comments.