Newby with ADC problems.

[Dwayne]

hello Mark,

Mark try incorporating this in your program...


TRISIO=%00001010 'Pic 12F675

' Define ADCIN parameters
DEFINE ADC_BITS 10
DEFINE ADC_CLOCK 3
DEFINE ADC_SAMPLEUS 50

'adval VAR byte

'Pause 100
'Loop:
ADCIN 1, number ' Read channel 1 to adval (0-1023)
'number = (number */ 500)>>2 equates to: (adval * 500)/1024
number = number >> 6


Your values should be between 1 and 1023...

And use only ONE pin at first (until you get it working) then go to the using two pins.

Make darn sure your pin has a A/C converter on it. and make darn sure your TRIS is set to a "1" to represent the A/D converter.

Also, your reading will not be a "Voltage Reading" but a reading of a number between 0 and 1024... you must convert this number to a voltage reading.

if 0=0 volts.
if 5=1024

Voltage= 5 X ADvalue / 1024



Dwayne