PIC16F818 ADC Problem

[BobEdge]

Thanks, but I just tried that & still get the same results, a maximum of 3 as the a/d result. I have tried chips from different batches, various settings for the adc clock, I am using a 8MHz resonator for the clock. I have measured the voltage on the pin (pin 17), and it varies from 0 to 5V. I have used the 818 in the past with no problems. That time I had a 20MHz osc, so I used clock / 64, i.e. ADCON0 = 129, ADCON1 = 206 and it worked fine. I just cant see why it wont work.

Oh well I'll keep trying....

[peterdeco1]

Try not using your ADCON statements. I've never used them & always worked for me. Also try the internal oscillator @ 4MHZ. Your program looks like it should work.

[BobEdge]

Thanks for your help.

I have got rid of the ADCON commands, and fitted an lcd display, it now works, kind of. It will work as an 8 bit a/d. Very strange, as I said I have used the 10 bit a/d of an 818 before. 8 bits will do though, in this case.

Regards
Bob...