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A short demo of a laser power meter that I managed to cram in a MiniDisc case. I don’t actually recommend that you build one - there is a lot of sanding, filing and hot-glueing involved and it eats batteries like candy. It would work better with something like an externally-programmed Attiny841 instead of Digispark which is not really suited for low-power. In any case you’d be better off with something like this instead: ... though it was a fun side project to learn a bit about Arduino stuff.
