Hi,
I buy this sensor, but i don't find a guide for it. Are You know some guide for it?
U got yourself the most expensive reed-relay I ever seen.
The relay close when in a magnetic field
Cute little circuit board, though!
It's difficult to tell from the picture but it seems one pin (near camera) is S for signal, and the far one is - for ground. So guessing the middle one is +?
So stick a battery across the + and -. Measure the signal between S and - and it should toggle when you bring a magnet near and take it away. Looks like a resistor behind the pins which presumably provides a pull up or pull down: you'll find out when you see if the signal is high or low when the switch is closed.