Problem with 10-bit A/D conversion - PIC18F2455 - LCD

[Kuba230]

Source is pressure sensor (output 0 - 1V), wchich is normaly working with 10-bit A/D - PIC16F877 conection.
I built conection with PIC18F2455, but not working properly.

[Kuba230]

Problem is solved, I changed LCD display, it is OK.

Thanks for your help.

[Heckler]

kuba230,
If I may jump in here now that your problem is solved...

but not working properly, value on LCD display is not correct.

So just curious... Was the 'bad' LCD displaying garbage characters or was it displaying a somewhat valid number??
Please be more specific as to what the 'bad' LCD was displaying.

Being more specific on describing the problem is more likely to help solve future problems

dwight

[Heckler]

To clarify... the reason I asked the above question(s) is because it seems to me that if the LCD was displaying any reasonable characters then the LCD was working.
Was it an LCD contrast issue or were the characters complete garbage??

Is it possible that you also fixed something else in your code that was suggested by the other reply's to your questions and that was the real problem??

That is why I asked about what exactly you were seeing on the LCD.

dwight

[Kuba230]

I atached photo of my wrong LCD. I do not know, what is the problem with LCD.
Display is marked as MC10621E8-SYL, *W 4034
But after changing, everything is OK.

[Heckler]

Hey Kuba230,

Thanks for posting the picture. So to me the picture says a lot... It definitely shows a problem with the LCD but it also shows that your code is working, more or less.
I would submit that if others that posted comments about checking your register settings and AD setup would have known your display looked like that they would have suggested a problem with the LCD before talking about your code setup.

It's obvious that you were smart enough to recognize that there was an issue with the LCD and you replaced the defective display.

The reason I am focusing in on the idea of accurately describing your problem is because I have spent the last several days working with a new electronic technician and trying to teach troubleshooting techniques. It has become clear to me that it is very important for one (anyone) to really think about what the symptoms in a given circuit are telling you, and if you are inviting others to make suggestions then the more accurate you can describe the problem then the more accurate will be the feedback.

Really just an academic point of learning to better communicate both with others and with ourselves.

cheers
dwight