How can I pass voltage through a wire only when it goes over 7 volts? Answered
I'm trying to hook up a Z-Wave contact sensor to my home alarms wired contact sensor. The alarm panel seems to provide a constant voltage of 6.8 when the door contact is closed and 13.5 when it opens.
The z-wave module I am connecting however looks for no voltage in order for it to be closed and any voltage for it to be open.
So how can I only pass the voltage to the z-wave sensor when it goes over 6.8 volts? I have a ground and power wire running to the respective terminals on my alarm panel.
I'm thinking I may be able to wire in a resistor but am not sure if that is what I need or what size.