I have this LCD, whose seller's spec is so scarce with info that I don't know how to generate a negative voltage for the LCD's contrast. The LCD is at http://www.sureelectronics.net/g...
Pin 3 controls the contrast. Obviously I need a pot to do the contrasting. I know how to do with positive voltage. How does one interface with a pot to produce negative voltage? Connect the VCC pin of the pot to the GND pin and the GND of the pot the VCC pin?
Just to start out slowly, say, I would like to have a -5V to pin 3 without a pot, how would I do that?
My VCC is +5V.