Do some Hall sensors have some inbuilt resistors or so?
I've found out that the BMW hall sensor I got possibly is wired the same way as the Mi16/S16/T16 cam sensor as follows:
Pin 1: +12v
Pin 2: Signal
Pin 3: GND
Looking at youtube on testing of hall sensors I made this little circuit to test the sensors:
HallWiring.gif 6.86KB 0 downloads
When testing on the S16/T16 cam sensor it does have 5.77volts between Signal pin and GND when there is no magnetic target in front of sensor.
It drops consistently to 0.02volts when I put a metal piece in front of sensor.
The BMW sensor however act more unstable.
But when first hooking it up, it shows 0.06 volts with no metal part in front of it. Putting a metal part there and it goes to 5.76v.
However when removing the sensor from the metal it does dip to between 2-4 volts before it goes to 5.76v again... But occationally it will drop to 0.06v again when metal is removed.
Should the wiring possibly be different for this sensor? Can it have some inbuilt resistors etc. that makes my wiring circuit not beeing adequate for testing it?