Hi All.
Have tried searching but couldn't find much.
I am looking to use a spare channel of a garage door radio receiver to switch an alarm system on & off.
This is simple enough using just the switched contacts though I would like the circuit and wiring to be a little more secure so as to prevent someone just tapping into it and shorting them.
I recall seeing a circuit years ago which was a simple resistor key based switch, where contacts of a relay would open/close based on a specific resistance received from a "key" which was plugged in (using any type of plug you chose).
Any ideas on how to make this wiring more secure would be appreciated.
Have tried searching but couldn't find much.
I am looking to use a spare channel of a garage door radio receiver to switch an alarm system on & off.
This is simple enough using just the switched contacts though I would like the circuit and wiring to be a little more secure so as to prevent someone just tapping into it and shorting them.
I recall seeing a circuit years ago which was a simple resistor key based switch, where contacts of a relay would open/close based on a specific resistance received from a "key" which was plugged in (using any type of plug you chose).
Any ideas on how to make this wiring more secure would be appreciated.