Tell us about yourself!

Complete Your Profile
  • Enable Auto Leveling for your 3D Printer with an inductive sensor (Marlin Firmware)

    There is an inherent flaw with the instructions related to the voltage divider across the web.You only need to add a resistor between ground and the digital output pin, not a full voltage divider circuit. Why? There is already a resistance in the power circuit of the sensor. You need to measure your particular sensors resistance between + and - inputs and then calculate the resistance you need, but it sure makes for a cleaner install.For my specific inductive sensor I use a 12VDC input to the sensor from the +12VDC control board input and then I drop in a 3.3KOhm resistor between digital out and ground of the sensor. The digital signal wire is the only wire that is connected to the sensor row of pins (ground is already attached to the power input and you don't want to create a ground lo...

    see more »

    There is an inherent flaw with the instructions related to the voltage divider across the web.You only need to add a resistor between ground and the digital output pin, not a full voltage divider circuit. Why? There is already a resistance in the power circuit of the sensor. You need to measure your particular sensors resistance between + and - inputs and then calculate the resistance you need, but it sure makes for a cleaner install.For my specific inductive sensor I use a 12VDC input to the sensor from the +12VDC control board input and then I drop in a 3.3KOhm resistor between digital out and ground of the sensor. The digital signal wire is the only wire that is connected to the sensor row of pins (ground is already attached to the power input and you don't want to create a ground loop) NOTE: Again the web is generally incorrect here. Do NOT connect your sensor output to the black input pin of the sensor input on your control board unless you confirm on the PCB schematic that it is indeed the digital input pin. Generally the black is the common ground and red is common +5V for the control boards. The alternate color (not black or red) is generally the digital input. I don't know how this is consistently wrong on websites, but I hope to prevent others from struggle with their installation.My resulting digital Output is 5.2VDC.One other thing, I find I don't need to keep active the auto bed level compensation with this sensor. Why? Well if you think about the accuracy and consistency of the inductive sensor relative to the large mechanical switch hysteresis, you home to the exact height every time. So if you don't mess with your bed leveling screws, you should maintain a perfectly level bed.

    View Instructable »