Printrbot - RevF4 board - with voltage selection and input buffering on the Z-stop.

3D Printing
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@Printrbot - RevF4 board - with voltage selection and input buffering on the Z-stop.

How do I wire a mechanical homing switch for the Z axis?

[UPDATE: RTM https://printrbot.com/shop/printrboard-rev-f6/ specifically the pdf linked to by the words “Click here for instructions for connecting a Z end stop and full wiring diagrams.”]

The probe I received in my DIY kit doesn’t work. The LED comes on when near metal, but the signal line is always hot regardless of the state of the LED (or proximity to metal). Therefore I can’t home my printer.

Looking at the schematic, there’s some extra bits attached to Pin 1.

X&Y pull pin 1 low (to ground) when closed.

Can I wire the same with the Z port? (1 & 3 to a NC switch?) or 1 & 2? and do I need t change the voltage selector?

[UPDATE: Change voltage to 5V via jumper, wire pins 1 & 2 to a NO momentary switch]

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Should be able to just swap to 5V on that jumper if I remember correctly.

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@Griffin_Paquette Did you have any issues with the proximity senors in the Frankenbot kits? Is there any special wiring to make them work or are they just plug-n-play? On the bench, the sensor seems to work, but plugged in the Printrbot board sees it as always triggered. The LED turns on/off as metal is brought close/far. Voltage selector is on high, measured at 12V.

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@Alex_Wiebe we had a few sensors that were bad (I would say maybe like 3 or 4 out of 33ish). Some gave strange readouts like that to which I just told the kids to grab a spare sensor. We had the luxury of having a good few extra on hand.