I am creating a 2nd LCD for a friend, so I added a second group of components. The group of components
on the right have the excess leads trimmed, while the group on the left still has them attached.
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Click image for larger view
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Click image for larger view
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Here is the ugliest piece, I used the scrap leads to connect the various joints. This is not the prettiest,
but I didn't have the equipment needed to build an etched circuit board. The photo on the right is an
image of the completed piece after converting over to the switch/potentiometer for the backlight.
Connect the Circuit Board to the LCD and Printer Cable:
For LCD pins 1-3, 15 & 16 solder on a length (~6") of wire and insulate with heat shrink wrap. For the
parallel port pins 18-25 connect them together, attach a length of wire and insulate, this will be the
parallel port ground wire. Parallel port pins 10-13, 15 & 17 are not used and can be trimmed.
Make the following connections:
- Connect the parallel port ground lead, LCD pin 1, and the ground lead from the breadboard to the black wire on the power adapter.
- Connect LCD pins 2 & 15 and the +5V lead from the breadboard to the red wire on the power adapter. DO NOT attach to the yellow wire which is +12V or you will destroy your LCD.
- Connect LCD pin 3 to Contrast Out on the breadboard.
- Connect LCD pin 16 to Backlight Ground Out on the breadboard.
- Connect the backlight potentiometer and switch to the two leads from the breadboard.
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Click image for larger view
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Click image for larger view
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Click image for larger view
Assembly is finally done. Go back and double and triple check you connections and circuit board. If you
are satisfied with your work you can loosely, attach the circuit board to the back of the LCD using a
small piece of double-sided foam tape or velcro.
