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Why not just use a thermistor? It's made for that purpose, already calibrated, costs a dollar or so, is tiny snd rugged, and can be read with a simple ohmmeter.
Sent from my iPhoneWow
all sorts of web sources explaining how to measure temp with diodes and transistors.
https://youtu.be/fvjDWfRpdAI
A transistor with two of three legs soldered together makes a temperature probe. Is
the temperature inside of lam too hot? Google for temperature probe circuits like I
do for other projects.