LCD wont work :(

[EvilGhozt]

Normally the contrast likes things on the "-" side. If you have a pot wire it like the example in the PBP manual. If not just try it going to the zero rail (-).

And PORTC 0-3 needs to be digital.

ANSEL = %00000000
That should turn all ADC off.
I think...

If I set Vo (contrast) to GND, I wont even get the black squares at start.

ANSEL = %00000000 <- I try that, no change.

If I use a voltmeter on PortC 0-3 all are logic low (0volt) idle. In start before the LCD initailized portC 0-3 are logic high (5volt), is that right?

[aratti]

Your diagram in post #8 has the contrast pot wrongly wired. Correct the wiring as per the attached snap. Then adjust the pot till you have clean characters on LCD.

Al.

[EvilGhozt]

Your diagram in post #8 has the contrast pot wrongly wired. Correct the wiring as per the attached snap. Then adjust the pot till you have clean characters on LCD.

Al.

im not using any pot at all. I have just put the Vo to +5volt with resistor between, if thats wrong I wouldnt seen those black squares, right?

[mackrackit]

Having the contrast wired wrong is the reason you see the black squares.

Having the contrast going to 5+ is wrong. Sometimes going to (-) will work but the best bet is to use a pot like the manual and Al said. Then it is adjustable.

[EvilGhozt]

I have just put a pot there, and now I either get black squares or nothing

[Acetronics2]

Hi,

For a quick contrast setting ... just use the forward voltage of a Si diode ( .5 to .6 v @ 1 mA ) to set Vo ... ( do not work with OLED displays !!! )

simple and efficient ...

Alain