Ryan

What you're looking for is a derivative function. What you can do is something like this

Code:
LastADC  var   word    ' previous error
CurrADC  var   word    ' current error
Threshold con  1        ' can be more if you want

loop:
  gosub ReadADC
  Error = CurrADC-LastADC
  if Error < 0 then Error = -Error ' make absolute error
  if Error > Threshold then
    High Output
    pause 1000    ' wait 1 second
    Low Output
  endif
  LastAdc = CurrAdc
  goto loop
This will more or less achieve what you want to. However, this is pure untested code. Use at your own risk.

Jerson