Adc giving widely flactuating values

[sayzer]

Some people may not agree on this but,

Have a cap on ADC pin.

Try from 10uF to 220uF. (Cap+ to ADC pin, Cap- to GND.)

and, change Pause 20 to Pause 500.


Please do not forget to post your results here.


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[mister_e]

thermocouple are sometimes tricky to read. I would suggest you to read Microchip AN684 and AN844 appnotes. You should find some interesting information. Also the following should be familiar...
http://www.delabs-circuits.com/cirdi.../doc00024.html

If it was me, i would use a dedicated Thermocouple A/D convertor instead... but it's me..

If you don't have any scope to see what's happen on the supply line and on the LM324 pin... it's like fishing in the dark...