Software ADC Comparator?

[Jerson]

Ryan

Now, I understand what you're trying to do. However, reading the adc like this hardly gives you anything worthwhile.

ADCIN 2, voltLevBf ' sample voltage on ADC 2
PAUSEUS 12
ADCIN 4, threshHold ' get threshold from pot set up as volt. divider on ADC 4
PAUSEUS 12
ADCIN 2, voltLevAf ' sample voltage on ADC 2 again, to check for difference
PAUSEUS 12

Why? The difference between the 2 samples on ADC 2 is just around 25uS. Is this what you really want??

On reading closely, I think you need to do this

'Find the minimum value
MinAdc var word         'I'm assuming the ADC to be 10bit or more
CurrAdc var word
Threshold var word
DelayVal  var word

while 1                                     ' loop forever
    ADCIN 2, CurrAdc                    ' current ADC reading
    ADCIN 4, Threshold                 ' threshold setting
    ADCIN 5, DelayVal                   ' delay setting
    if CurrAdc > MinAdc + Threshold then
           High Output
           pause DelayVal
           Low Output
           if CurrAdc <> MinAdc then  ' check if the current ADC value < Min ADC
             MinAdc = CurrAdc          ' and correct the MinADC value
           endif
    endif
wend

Does this do what you want?
Jerson

[Ryan7777]

I don't know yet, i'll have to give that code a shot, one thing i did figure out tho is that my justification was wrong, i should have had it set to right justify, and I should have saw that earlier! I used serout to spit out the ADC values and now everything looks like it should, but i'll have to do further testing.

Thanks again!