Universal NPN-PNP INDUCTIVE SENSOR Auto bed level opto isolator interface board
thingiverse
**UPDATE 10/29/2016 Now Available PCB Boards** When adding an auto bed leveling inductive sensor, you'll encounter the challenge of interfacing it with your controller, such as Ramps or others. Thanks to Dennis Brown for the idea of using an optocoupler circuit; I designed this board to connect the inductive sensor to a 12-volt rail and extract the 5-volt signal when active! I modified the controller end to include a resistor used to pull up the opto. This board is fully configurable for NPN and PNP inductive sensors. The circuit diagram has been updated. Available as a kit on my Tindie page.
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