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Editorial Team
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Asked: 2026-06-12T08:43:53+00:00

Is there an easy way, without using higher math, to calibrate a touchscreen? I

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Is there an easy way, without using higher math, to calibrate a touchscreen?

I have written my own LCD library and my own touchpad library, both do work great, but of course I need to calibrate the touchpad before it gets usable results.
The only thing I found is this, and that’s to much math for me.
Also I don’t need a very very accurate result. Just beeing able to get +- 10 pixels.

I use a TFT 3.2″ LCD 320×240 module with SSD1289 controller, and ADS7843 touchpad controller.

http://www.eetimes.com/design/embedded/4023968/How-To-Calibrate-Touch-Screens

Thanks for your help.

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1 Answer

  1. Editorial Team

    I worked out a simple solution. It uses simple linear algebra.
    This works only accurate, when the TouchPad foil is sticked parallel and not in a slight angle to the screen (which is correct in most cases).

    calibration source code

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