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Cool! ( I mean HOT!)
Two things to consider:
1 - Any lens caps will throw off the measurements because the sensor will average the temps between the lens and the tire
2 - Different tire compounds can give very different IR signatures, so make a calibration mode where you measure the tire temp with a thermocouple probe, and set the "baseline temp" that way.
I have always wanted to make an IR line scanner over each wheel.
Then as the tire rotates, you get a complete temperature map in near real-time.
You would see flat spots, or incorrect suspension setups that way.
What temp sensor is that?
Arduino based?
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