Hi Everyone.
The MCUFriend library work fine with all the examples , identifies the TFT Screen as ILI9341.
Arduino ide 1.8.15 and UNO R3.
When I run the Calibrate sketch with UNO and TFT Shield connected to my pc (Power from pc USB Voltage is 4.2V) calibrate ok.
When I remove the UNO from the pc and supply 12V to the UNO dc jack socket the calibration is out with around
I had some internet connection problems so my post was saved to Draft.
Later when I send the Draft I saw the botom lines is missing .
Should read ..calibration is out with around 5 pixels.
and
Thanks for any advice.
Why would anyone want to use 12V ?
The current Mcufriend pcb is badly designed. The backlight is powered by the wimpy Uno 3.3V pin.
I suspect that the working voltages are different between using USB and external jack. Simple enough to check with a DMM. e.g. measure the 5V pin and measure the 3.3V pin. Compare with the voltages obtained via USB.
Anyway, it is simple enough to tweak the Calibration values.
David.
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