Hello
I have bought a home alarm system that has window/door sensors. This sensor has a circuit that alarms the system when the internal reed switch goes from closed to open. Which means someone opened a door (the sensor goes next to a magnet, when the magnet goes far, the reed switch opens).
If it goes from open to closed nothing happens.
I have an urgent need that is transforming the window/door sensor in a water leakage sensor. Before finding how the window/door worked, I thought of connecting two wires to the contacts of the reed bulb: when the water would close the circuit, the sensor would alarm, since I thought it would check of change of status.
But, like I said, the sensor works only if goes to close to open.
When I tested my "water leakage sensor", infact, I put these wires in the water and nothing happened. But as soon as I take them out, it alarmed the sensor!
What I need is the simpliest way to "invert" the status of the sensor so when the water closes the circuit, it alarms. Or something that, when the circuit is closed by the water, it sends a close then open to the sensor. Or goes closed>open>closed
In a few words, if the water closes the circuit, it should open the circuit instead of closing it.
What the SIMPLIEST way to do it?
Thank you very much!!!