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Topics - mhathaway

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Character LCDs / NHD‐C0220AA‐FSW‐FTW Contrast
« on: February 25, 2015, 06:14:11 PM »
I am using the NHD‐C0220AA‐FSW‐FTW and it works great on my first board.  I am trying to get a second board up (same PCB design, same software), but the nothing come on the LCD.  I think that it's a contrast problem but no matter what voltage I put on pin #2 (3.3V down to .013V) I can't see my text.  Here are the voltages on my pins:
1. 0V (gnd)
2. adjustable, but trying 0.1V and lower
3. 3.3V
4. Mostly 3.3V (brought low during instructions, but defaults at high)
5. 0V (gnd)
6.  Mostly low, brought high during messages
7-14. Parallel message.

Any ideas on what i should try?

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