LCD1x9 - Contrast adjustment

[poivan]

Hi All,

I have connected LCD1x9 display to OLIMEXINO-328 board, but contrast is very high so even the segments which are not ON are visible. Is there way to adjust the contrast?

Thanks

[LubOlimex]

Hey,

It seems that there is no way to change the contrast of MOD-LCD-1x9. Only I2C and power pins are connected to the UEXT, indicating that there is no hardware control of the contras. The datasheet of the controller doesn't indicate for a software control also. The controller datasheet is here: https://www.olimex.com/Products/Modules/LCD/MOD-LCD-1x9/resources/LCD1X9.pdf

Best regards,
Lub/OLIMEX

[lambda]

Hi!

MOD-LCD-1x9 uses a PCF857DU style controller. I believe the original PCF857DU can control contrast by writing to the right register. However not sure if the used clone is compatible in this regard.

@poivan: Which software are you using to control your MOD-LCD-1x9?

HTH,
Harald