This version uses 5 IR emitter/receiver pairs to read five of the nine potential pip locations on a die face. Five is the minimum number of locations you have to look at to definitively read the orientation of the die. I had to file down the edges of the detectors to get them pip-distance apart and place the emitters directly behind the detectors so they’d get maximum reflection from the surface (And there is really no other place to put ’em.) On a white area of a die it returns a really nice signal. Which means what I’m really detecting is a lack of a pip, counting the white areas rather than the dark ones.
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