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Inductive sensor mount BQ Prusa i3

by ajpl Jul 12, 2016
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Wich sensor do you use? LJ12A3-4-Z/BY or LJ12A3-4-Z/BX? Can you explain the exact modification at sw (configuration.h)?


Where I connect these wires? I have to change the firmware? I apreciate any information, thanks ; ) !

You should disconnect the Z Endstop and instead plug your sensor the following way:
Brown: VCC (12V)
Blue: GND
Black: (Signal) With a diode like a 1N4148, plug the cathode of the diode to the black wire and the anode to the processor input
If you plug it this way you won't need a voltage divider and regulator some people suggest, it's easier and it works great.
As for the firmware you should uncomment ENABLE_AUTO_BED_LEVELING on Configuration.h and change the settings to match your setup.

Thanks! But I have another problem.. the sensor doesn't detect my heatbase. Do you put something with metal between the glass and the heatbase? If i remove the glass the sensor detects the copper film but with the glass thickness doesn't works. Sorry for my doubts, I'm a begginer : )

I'm glad to answer your questions, don't worry about it. I use a sheet of aluminum foil (the one you use in the kitchen) under the glass and that works perfect for me (no heated bed) eventually I'm looking forward to upgrade to an aluminum sheet to make it look better, but for the moment this quick solution has kept on working for around 2 months, so I am on no hurry to get that sheet ;) Hope this helps!