Autobed leveling with inductive sensor. trigger problem

Hello RepRap community,

I am Matthijs and this is my first question on the RepRap forum. I have a question about autobed leveling with an inductive sensor.

I have an inductive sensor which is called a LJ12A3-4-Z/BX. connected to my megatronicsV3 zmin enstop

I have te same sensor and the same resistor values which is used in this video [www.youtube.com]

see the attached picture for my settup

I think the problem is that when a piece of metal is put against the sensor (this is triggering te sensor), the sensor output voltage is 3v and not 0 volt like a normal mechanical switch when it is triggered.
when no metal is put against the sensor the voltage is 4.8 volt.

Is my sensor broken? do i need to change my settup?

I hope you guys can help me.

Greetings
Matthijs W

Edited 1 time(s). Last edit at 05/21/2015 03:08PM by MatthijsW.

SOLVED

I solved the problem i forgot to comment out this lin: //#define ENDSTOPPULLUPS // Comment this out (using // at the start of the line) to disable the endstop pullup resistors