I have one of these : https://www.ebay.com.au/itm/232217305235 that I am wanting to use on my 3d printer for auto bed levelling. I need to run it at 12v, as it does not appear to work properly at 5v. My understanding is that when triggered ground the signal pin, and that it should not be outputing the input voltage on the signal at any time. What I have found however, is that when the sensor is not triggered, I get 12v as measured between the ground pin and signal, and when triggered, I get ~0.1v. Is this normal? Am I doing something wrong in my testing? Ami I completely wrong in how I expect this to work? Alternatively, is it possible this sensor is faulty?