Previously, I posted about a 5″ touchscreen for the Raspberry Pi.
But I did not mention calibrating the touchscreen.
After a week’s holiday, I came back and sorted this fairly easily.
I was using Raspbian Jessie from NOOBS 1.8
First I installed a new utility:
sudo apt-get install xinput-calibrator
To calibrate the touchscreen, go to the menu>preferences>select “Calibrate touchscreen”
Touch each of the red crosses on the screen in turn, then cut and paste the resulting snippet to the following file by using this command:
sudo nano /usr/share/X11/xorg.conf.d/98-calibration.conf
(this will create a new file and open it for editing)
My entries are below:
MatchProduct “ADS7846 Touchscreen”
Option “Calibration” “120 3970 205 3920” #(enter your numbers here)
Option “SwapAxes” “0”
Ctrl-O to save, Crtl-x to exit, and then reboot, and your pointer should follow your finger correctly!