There are also thermal diodes, which are more accurate than most thermistors. Despite their name, they're actually transistors with the base and collector connected to each other since that is more "ideal" than a diode for that application.
Digital temperatures may be thermal diodes built onto the same chip as the ADC, but some use two oscillators whose frequency varies in a predictable manner over temperature.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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