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Hi everyone

I try to show you how you can connect npn sensor and setup repetier configuration for auto bed leveling.

This is my first project ,of course ı may have some mistake and some missing information however I regularly check the comment to help those who want to use auto bed leveling on their 3d printer :)

Step 1: Step1: About Sensor and 3d Printer

in generally we use in 3d printer NO and gnd at trigger about 5v.
There is a two type sensor ,pnp and npn.

npn sensor

when it connected to 12v ;
not trigger, give 8 -9 v which is ok for 3d printer
trigger, give zero volt , so everything is ok for 3d printer

pnp sensor

when it connected to 12v, it gives 12v at trigger. so it will damage 3d printer.

if your pnp sensor is working when cennected 5v , it is ok , but not working you should reduce the output voltage to 5v or less and you change the firmware for pnp sensor.

I have experience in capacitive npn sensor and ı will mention about this type of sensor.
I buyed this
https://tr.aliexpress.com/item/High-Quality-LJC18A3-H-Z-BX-Approach-Sensor-Cylindrical-Capacitive-Proximity-Switch-NPN-6-36V/32627840658.html?isOrigTitle=true

Hi I just tried to do what you write but my printer after leveling print in the air like 2 mm
I happy to hear that you do very things correct :) now you should arrange z probe height in eeprom setting in repetier host
You should really explain how to set up a voltage divider so folks who use 12 volts don't try their Arduino mega.
<p>sorry for the missing part, this is my first project :)</p>
*fry their Arduino mega
Ooww i am sorry to hear that :((<br>Your sensor npn or pnp?
<p>It looks good :)</p>

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More by citkit:AUTO BED LEVELİNG/ Z PROB WİTH REPETİER FIRMWARE with capacitive npn switch 
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