LCD 4x20 HD44780

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  1. - 27th June 2006, 15:43 #1
    O2_Guy's Avatar
    O2_Guy
    O2_Guy is offline Junior Member
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    Default Negative contrast voltage

    Recently I bought two Hantronix HDM16216-B LCD's. I got the same results as you did. Needed a negative contrast voltage.
  2. - 27th June 2006, 16:52 #2
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    Melanie
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    If your PIC has a spare unused PWM output, you can easily create a (software variable) negative voltage and drive your LCD contrast from that directly. The added bonus is that by varying the duty cycle, you have full software adjustable contrast.
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