A while back HD posted about using diodes as cheap temperature sensors:
https://hackaday.com/2018/04/16/two-cent-temperature-sensors/#comment-6192482
But chasing mV sized forward voltage deltas is hard to do with the limited ADC on most mcu's. Our LED light-sensing experiments demonstrated that timing reverse-bias decay with the Input Capture Unit on an Arduino is easy to do, and provides high resolution temperature readings from a single diode without any amplification:
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