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SparkFun_MLX90640_Arduino_Example
Controlling and reading from the MLX90640 IR array thermal imaging sensor
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It's really a golden age for EEs. If he likes to play/experiment with stuff, then a good online store is Sparkfun. My wife still gets me gift certificates from there & I love it. You can make/create A LOT of things from there. If he likes to program/software, you will find a lot there.
There could be so many improvements... and there are already so many versions of the original. For example, for old caps, sometimes ESR is so high that it shows up as a resistor... how about an op-amp tester?