> I'm working on connecting temp probesto a 16C84.  One idea is to use
> a voltage controller oscillator and connect it to an I/O pin and
> determine the timing. Use an analog switch to multiplex the input
> and go through timing a high and low reference voltage to compensate
> for any temperature drift, etc. Perhaps there is an integrated A/D
> converter out there doing all the already?

What kind of temperature probe?  Is it a thermistor, thermocouple,
RTD, or what?

and.. What kind of accuracy do you need?

I've built some simple temperature probes with a thermistor, a
resistor and a capacitor, and using timing to digitize the input
signal (ala' app note AN512)  .  There are a lot of pitfalls, but it
works.   No A/D converters, no op amps, no analog stuff, just three
parts.

HOWEVER if you are a newbee I wouldn't recommend this as your first
project.  Try something simple.  Make a light light or a beeper honk.


p.s.  There are no stupid newbies.  Anyone who even consideres
learning about microcontrollers has to have a quick wit.


Best Regards,

Lawrence Lile