Victor wrote...

>while we are talking about temp controllers!
>does anyone know of a simple thermocouple circuit using a pic or????
>I would need the temp to go up to about 200c
>also are the adc features in the pics sensitive enough to
>sense the low output of the thermo couple with out amplification?

Without amplification, a thermocouple's output is nowhere near
large enough to be read directly by a PIC's A/D converter.

Look on Microchip's web site for Application Note AN684, "Single
Supply Temperature Sensing with Thermocouples".  This appnote
contains a lot of good information on using thermocouples, as
well as complete circuits for interfacing them to PICs.

DD

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