> should I include a POT in the circuit for adjustment Hi Carl, maybe buffer the sensor / thermistor with an op amp and adjust its DC output with a pot. That way you won't affect the sensor's / thermistor's output characatristics by loading it directly with a pot You could add a 'Calibrate' pushbutton. At a known pressure or temperature, push the putton and it will add / subtract an offset to the ADC result of a previously determined reference or standard -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist