Hello Barry,

> Typically, you put in a 10k pot between Vss & Vdd with the slider on pin 3
> (mine looks great with just a 3.3k resistor from pin3 to ground).  I tried
> what I thought might work, but it didn't. (a cap across gnd and PWM with
> resistor going to the contrast input)

    this should work. I've used it many times.

    PICPWMOUTPUT------*------LCDVEEINPUT
                      |
                      |+
                     1uF (electr cap)
                      |
                     GND

    The cap value depends on the frequency of your PWM output. I don't think
you need a resistor, maybe this is messing your circuit.

    Try to see with an scope if your cap is filtering all the ripple, as
this could cause some strange "moving lines" on the LCD. As you're doing
this, also see if the PIC PWM output is making a good voltage swing.

    Best regards,

    Brusque

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Edson Brusque                 C.I.Tronics Lighting Designers Ltda
Researcher and Developer               Blumenau  -  SC  -  Brazil
Say NO to HTML mail                          www.citronics.com.br
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