ADC not working - I'm a new member

[johnbond]

I've migrated from the Parallax sx but I'm new to PICs and PicBasic Pro

How do I use ADCIN

The following program is meant to display the binary value of a pot on AN2 on 8 LEDs on port RC. It doesn't work!!!

================================================== =========

' Name : LearningADC.bas
LEDs var PORTC

' Allocate variables

PotVal Var Byte

ANSEL = %00000100 ' Set PORTA.1 analog, rest digital
ANSELH = %00000000

mainloop:
Adcin 2, x ' Read ADC value on AN2 (PORTA.2)
LEDs = potval
Pause 100 ' Do it about 10 times a second
Goto mainloop

End

================================================== =========

Thanks from Kwa Dukuza, lost somewhere in South Africa
John Bond

[cncmachineguy]

I think your problem is here:

Adcin 2, x ' Read ADC value on AN2 (PORTA.2)

you are reading the value of AN2, then storing in x
You should be storing in potval

And WELCOME to the forum!!

[johnbond]

Sorry, I spotted that after I posted but this is still not working...

I've added

=========================================

ADCON1 = %10000100 ' Set PORTA analog and RIGHT justify result
ADCON0 = %01000001 ' Configure and turn on A/D Module channel o Fosc 8

=========================================

and changed

=========================================

Adcin 0, PotVal

=========================================

I don't understand registers. I've read the PIC16F690 DATASHEET a couple of times. I seem to handle these issues best using the "Monkey see... monkey do" philosophy when trying to grasp complex problems. (Maybe the Monkey see, monkey do is part of my African heritage )

[cncmachineguy]

I don't have my book handy, but if you look at the ADCIN section of the PBP manual, there are several DEFINES you need in order to use the ADCIN command. Also to post code in the cool code box, you need to use tags. Really simple:
[code[ <----should be the other, but then you won't see the tag
All your code here
[/code[ <----Again the second bracket should be } without the shift key.

Maje sense?

[johnbond]

Thanks for your help Bert,

Bert said "[code[ <----should be the other, but then you won't see the tag
All your code here
[/code[ <----Again the second bracket should be } without the shift key."

Ja dit maak sense, dis cool! (Afrikaans response to Bert's last question - For English, replace "this" for "dit" and "dis")

I've tried the various DEFINE and REGISTER options but I really don't know what I am doing. Nothing happens. I haven't linked up a UART/USART yet so I can't debug and I am in the dark. Hardware RS232 is my next exercise and I think I'll need to understand REGISTERS for that.

Kind regards from Kwa Dukuza, lost somewhere in darkest Africa
John Bond

[cncmachineguy]

Well now we need the basic stuff - lol. What pic? what version PBP? MPLAB or MCS? PM or MPASM? Internal osc or external? Some of it we don't need for this problem, but its a good idea to let us know what you are working with.

What doesn't work? do any led's work? Can you make them blink? Is the value just wrong?