I have a soldering pencil which has an integrated PTC RTD built in. The temperature of the RTD can be represented using this equation y = 0.0056x^2+4.9382X-239.43 where x is the resistance of the RTD and y is the temperature in Celsius. The resistance would vary from 50 to 100 ohms (its a relatively…

Measuring the resistance and thus temperature of an RTD

anatolyk69_gmail.c May 6, 2013, 1:26pm 4

Table from AVR121, google for it. OPA - operational amplifier: Operational amplifier - Wikipedia

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