How to Make a Hidden Alarm

Review the security system to verify that it has wireless connection capability that supports the addition of motion sensors and cameras. These controllers are readily available and are standard on most high-end systems. If the controller to the security system does not have this capability, replace it with a wireless connection-capable controller. Verify that the system has an always-on broadband Internet connection.

Construct the primary hidden alarm capability in a controlled circuit at primary points of entry. These are typically an electrical circuit that the intruder silently and unknowingly trips by physical action that is totally hidden. A simple power failure sensor works quite well. Wire the circuit through a control point, such as a hinged gate, that the intruder must enter to gain access to the structure. Opening the gate trips the alarm.

Disguise the wiring to and from the gate or other access point by its color and visibility. Make the connection point at the bottom of the gate or another innocuous point. Terminate both ends of the circuit at a wireless control point and set the alarm reaction to silently alert the controller to the desired action -- video activation, email alert or auto-dial authorities, for example. These are all typically code-programmable into the wireless receiver of the alarm system.

Terminate each wired circuit -- for each gate or door -- at a separate wireless controller with a single normally-closed circuit sensor. Set the controller to send the proper code or signal to the system controller.

Install a backup silent alarm capability for added security by placing pressure-sensitive mats or motion detectors outside all the entrances and/or windows surrounding the structure or office. Set the controller's wireless recognition signal to the desired action. This is typically code- or number-based selectivity. In most cases, the action to be taken will be to turn on cameras, send email messages or auto-dial police authority.

Test all circuits and all sensors, gates or mats individually. Verify that the desired action is being taken and that the alarm system controller is functioning properly. Add additional capability, such as battery-powered video recorders that are not part of the primary system, as needs arise or to augment security levels.