Quite simple just a cheap <5 mwlaser and a bpw34 pin fotodiode, the fotodiode feeds a LM311 comparator and the other input of the 311 to a potenziometer so I can choose the correct threshold
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Quite simple just a cheap <5 mwlaser and a bpw34 pin fotodiode, the fotodiode feeds a LM311 comparator and the other input of the 311 to a potenziometer so I can choose the correct threshold