z probe always open

[ilanodem]

I've connected an inductive z probe and just can't get it to work properly. It's PNP NC type, i've lowered the signal output from 24V to 5V using LM7805, however when connected to the board whenever it detects metal and the light comes up, the S voltage drops to only around 1.5V instead of ground so it's not registering as logic low and M119 reports it as open. My guess is it has something to do with a pullup resistor however changing all related pullup and/or pulldown settings on marlin configuration has no effect. I've also tried using multiple other pins with the same outcome. Any thoughts on what can help?

[sdoe0]

Propably a faulty probe