Trying to drive a NHD-320240WG-BxTFH-VZ# with Arduino Atmega2560

Bart Friederichs

• November 18, 2023 17:48

I am trying to get this display working on a Arduino Mega2560: https://newhavendisplay.com/content/specs/NHD-320240WG-BxTFH-VZ.pdf and to do so, I used this code: https://support.newhavendisplay.com/hc/en-us/articles/4414078359191-NHD-320240WG-B-with-Arduino

I used pins 22 to 29 for PORTA (according to https://docs.arduino.cc/hacking/hardware/PinMapping2560)

When I upload and run the code, nothing happens. 

The thing that I do not really get is the "negative voltage" of -25V, which is apparently built-in in this version of the display, but I measure nothing on pin 17 of the display (I power it through the Arduino's 5V on pins 1 and 2).

I already tried to power the backlight with a separate power supply, and I can get it brighter, but still nothing appears on screen.

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  Engineering Support

  Community moderator

  • November 20, 2023 22:15

  Hi Bart,

  Thank you for contacting us through email as well. This issue is being supported via email.

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