Pic12f683 Cmcon0 = 7

[StoneColdFuzzy]

OK, the penny's dropped...

mon = 16 bits, whilst width = 8 bits... you can't put a quart into a pint pot...

try...

width = mon/4

In case you're wondering why /4 instead of /8... that's because your ADC reading is 10 bits. So why not read 8-bit ADC to start with?

Because I'm such a noob that I have no idea how to do that. Now I'm really confused.

So with this change, when the IC reads less than 2 volts on "mon" it should execute hpwm 1,255,2000; more than 2 volts and it should execute 1,32,2000?

~ Dave

[Melanie]

Looks like we have a lot to learn here...

No, it WON'T be two volts....

The ADC returns a number between zero and 1023 (because you are in 10-bit mode), where zero equals 0v on the ADC, and 1023 equals full-scale 5v on the ADC. Each click on the ADC scale represents 1/1023 ie a FRACTIONAL part of 5v.

So if 5v = 1023, then 2v will be two fifths of 1023 (namely 409).

So, if you want the trip point to be 2v and with a 10-bit ADC, your code should be...

Main:
    ADCIN 3, mon ' Read channel AN3 to Mon
    if mon > 409 then 
	hpwm 1,32,2000
	else
	hpwm 1,255,2000
	endif
    pause 1000
    goto main

[StoneColdFuzzy]

Looks like we have a lot to learn here...

No, it WON'T be two volts....

The ADC returns a number between zero and 1023 (because you are in 10-bit mode), where zero equals 0v on the ADC, and 1023 equals full-scale 5v on the ADC. Each click on the ADC scale represents 1/1023 ie a FRACTIONAL part of 5v.

So if 5v = 1023, then 2v will be two fifths of 1023 (namely 409).

So, if you want the trip point to be 2v and with a 10-bit ADC, your code should be...

Main:
    ADCIN 3, mon ' Read channel AN3 to Mon
    if mon > 409 then 
	hpwm 1,32,2000
	else
	hpwm 1,255,2000
	endif
    pause 1000
    goto main

Wow, it's no wonder I was frustrated enough to chew the lips off of a carp!

OK, where is it that I look up the ins and outs of 8 bit, 10 bit and such? I'd love to find a PBP book for Dummies or something like it.

Thanks again Melanie!

~ Dave