Peters,

YOU ARE THE MAN! <VBG>

It worked as soon as I hooked up that pot.

I would never have believed it was that simple.

There it is , that little display saying "Hello" at me, and I can even
adjust the contrast now!

Thanks very much,

Sean



At 07:35 PM 10/7/98 -0700, you wrote:
>Hi,
>Vo voltage for the LCD contrast adjustment, You need a 10-5 KOhm trimmerpot
>between Vdd and Vss the wiper goes to
>Vo. There are more tricky circuits to control the contrast ( contrast is
>very temperature dependent ) but this is the easiest way to check. Do not
>connect any data line, if your PS rising time is OK it  will reset itself
>and adjusting the pot You must see all dots in one line are on.
>The reason of using different pins for the background LCD because they usual
>current is 100-300 mA and most of the designers do not want to dissipate
>that thru the 5V power supply .
>I have Optrex data sheet better discription of the data lines. Let me know
>and I will fax You,
>Cheers,
>Peters
>
+--------------------------------+
| Sean Breheny                   |
| Amateur Radio Callsign: KA3YXM |
| Electrical Engineering Student |
+--------------------------------+
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