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  1. #14
    In terms of proximity sensors :
    I would go for the 4mm distance sensing type

    Prox sensors are more sensitive on steel targets compared to aluminium

    They run on something like 12V -30V, typically 24V. When triggered they output this same level so they can’t go straight into a 5V BoB ( is my experience) without doing something to the signal. If your BoB can take this higher voltage then no problem.
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

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