M12 Inductive Proximity Switch NPN NO DC 6-36V With 4Mm Detection Range LJ12A3-4-Z/BX By Twidec Review

Bought two of these for a cnc project to use as a homing limit switch which it didn't work. It is NPN because the signal line does connect to the negative wire and it is NO because it switches when metal approaches it but the voltage doesn't drop to 0.it just stays at 5v which is the voltage I have running it. I have tried it at higher voltages and I get the same results. Same results for both sensors purchased.not happy.

I purchased this inductive sensor to control the feeding of rifle cases in my annealer. It’s rated 6-36v DC. The power supply and the motor it controls is 12v. The problem is the output from the sensor was @ 4v and instead of dropping to zero once the sensor was activated (which is what you’d expect in a normally closed sensor), it increased the voltage to 6v! Either way, it’s not going to work in a 12v system. So, back it goes and we’ll try a different brand.

I purchased this inductive sensor as a bed leveling sensor for my Monoprice Select V2. After upgrading the Marlin firmware and making a few changes in the Configuration.h tab I got the sensor to work. I connected the sensor to an Arduino Uno powered with a 9v battery. The sensor is being powered with the input voltage (9v) which gives the sensor enough of a sensing distance that the sensor could be places slightly higher than the hotend nozzle (.12mm). This setup supplied enough voltage to the…