On the number pad, I press "1" and it will register the number 3" and vice versa, however, the numbers in the center of the pad work normal, so It could be the Y or X axis are reversed. I attached a picture of the number pad to give a better illustration. I'm using a Kuman UNO R3 2.8 inch TFT and …

Number Pad's Numbers Flipped on Touchscreen

Mr-Neon October 4, 2017, 9:11pm 6

How do you derive the calibration values?

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