This post shows how I am now replacing the LCD contrast POT with the use of PWM from the uC.
This is based on a Maxim appnote.https://www.maximintegrated.com/en/design/technical-documents/app-notes/3/3658.html
The Appnote discusses the serialisation of the LCD communication (see LCD_IO 2 for this) but the Appnote shows the use of an OpAmp to control the contrast.
So, a few resistors and an OpAmp with PWM from Great Cow BASIC as the Pot is removed.
Simples.
Enjoy
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This post shows how I am now replacing the LCD contrast POT with the use of PWM from the uC.
This is based on a Maxim appnote.https://www.maximintegrated.com/en/design/technical-documents/app-notes/3/3658.html
The Appnote discusses the serialisation of the LCD communication (see LCD_IO 2 for this) but the Appnote shows the use of an OpAmp to control the contrast.
So, a few resistors and an OpAmp with PWM from Great Cow BASIC as the Pot is removed.
Simples.
Enjoy