About homing and switches...

[cropwell]

As per reply #17 to this thread:

John, this topic was discussed (with the internal circuit you reprint) in 2016, till I got sick of it. The LJ12A3etc is designed for industrial 24v control sensing, but it works equally well switching amateur 5v (without diodes) if your BoB pulls the pin to logic 1 at 5v. The supply voltage to the device electronics has to be min 10v max 36, it will work below 10v, but not reliably, presumably because the oscillator duzzn't buzz. It has an internal 10k, but even so, the thing operates for practical purposes, just as if it is a NO relay on the blue and black wires. I happily use them with a 12v supply with the black wire connected directly to the BoB input.

Peace and Love

Rob-T