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==Use the Raspberry OS that we provide==
* On the Terminal, enter
''sudo su''
''DISPLAY=:0.0 xinput_calibrator''
Then the sreen will show 4 points. You need to click 4 points step by step to calibrate. After calibration, you will get 4 new calibration numbers. Copy them.
[[File:3.5inchCali1.jpg|800px]]
* On the Terminal, enter
''sudo nano /usr/share/X11/xorg.conf.d/01-input.conf''
Use the 4 new numbers replace the 4 old numbers ,Press the keyboard “Ctrl + X” ,then choice “Y”, Press the ”Enter” exit.
* On the Terminal, enter
''sudo reboot''
After reboot ,the calibration will be ok
== Use your own Raspbian OS(Such as official Raspbian OS) ==
* Download the [http://www.raspberrypiwiki.com/download/images/xinput-calibrator.deb xinput] calibration software .Copy it to your Raspbery Pi
* Install the software.On the Terminal, enter
''sudo dpkg -i -B xinput-calibrator.deb''
* On the Terminal, enter
''sudo su''
''DISPLAY=:0.0 xinput_calibrator''
Then the sreen will show 4 points. You need to click 4 points step by step to calibrate. After calibration, you will get the following. Copy them.
[[File:3.5inchCali2.jpg|800px]]
* On the Terminal, enter
''sudo mkdir /etc/X11/xorg.conf.d''
''sudo nano /etc/X11/xorg.conf.d/99-calibration.conf''
Past what you have copied just now to the file
[[File:3.5inchCali3.jpg|800px]]
Press the keyboard "Ctrl + X" ,choice the "Y" ,Then press ”Enter” to save the file
* On the Terminal, enter
''sudo reboot''
After reboot ,the calibration will be ok