1.poor and/ or noisy power-supply
2.Use of Analog i/o
3.Use open drain i/o
4.Vo pot value too high
5.I hear that some LCD in 4 bit mode may need to have their unused DBx line to Vss OR Vcc.
6.Aliens
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1.poor and/ or noisy power-supply
2.Use of Analog i/o
3.Use open drain i/o
4.Vo pot value too high
5.I hear that some LCD in 4 bit mode may need to have their unused DBx line to Vss OR Vcc.
6.Aliens
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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Vo problem
I found that Vo was to high. I placed a variable resistor between Vo and ground and was able to see the display fine. So you were right abt Vo.
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