Advice on cockroach detector

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hi, can point me skills , tools needed build kind of cockroach detector? imagine motion sensor put on ground , alarm sounds depending on size , speed of moving thing, maybe that's not best way think it. i'm total newbie on arduido, have science background. i'd appreciate tips on how start :)

quote
i'm total newbie on arduido, have science background. i'd appreciate tips on how start
you need more specific under particular conditions want detect cockroach. vague requirements result in vague solutions.


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