I have been working on a project using a 20x2 LCD module.  I am using a
variable resistor to control the contrast of the display.  The thought
occurred to me that this is a voltage level that might be suitable to use a
PWM to control.  Has anyone else tried this?  The advantages would be less
parts (always good), and allowing the user to adjust the contrast from the
key pad rather than with a knob.  Disadvantage is that the system now needs
to remember the last setting, but I already have a EEPROM in my design so no
big deal.

Thought?

Norm