How a motion sensor alarm operates

October 27th, 2009

Motion Sensor Alarm

There are various types of motion sensor alarms. Usually a system consists of a sensor, a controller and an output (speaker). The sensor basically monitors the area, the controller is used to activate or inactivate the system by inputting a password and the speaker is pretty self explanatory.

Most of them can be pre-programmed to be schedule to turn on and off during certain times. When an alarm turns on, it has to be manually deactivated through the controller, by inputting the password. Nevertheless there are remote controls that exists that can do the same job, more advance modules allow the user to send a SMS code via the mobile phone to disable the motion sensor alarm.

Customized Configuration

Nowadays the systems are easily configurable, which allows you to program the alarm system however you want. If you go to work at 9am to 6pm, you can set it to turn on at that specific time, and when you come back at 6pm, it disables itself automatically. Similarly if you go on holiday, you can just set the alarm on 24 hours a day. There are systems that even let you monitor your house via an online interface, noticing you if something is wrong even if you are abroad. More advance systems could incorporate a motion sensor camera which would record if it senses movement.


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Basic motion sensor alarm introduction

October 22nd, 2009

Traditional Circuit Alarms

Motion Sensor AlarmThere are two types of circuit alarm: closed circuit and open circuit. The concept is a simple electrical current in which is either open or close. This can be applied on a window or a door. The alarm is triggered when the door or window is opened.

The disadvantage of this system is that all the burglar has to do is to cut off the wires, nevertheless the control box is usually put away so the criminal can’t find it easily. This is the most common type of motion sensor alarms.

Motion Detectors

Motion detector works by constantly monitoring a space for irregular wave patterns. The idea is that when there are disturbances in the room this perturbs the general pattern that the sensor is set to, thus triggering the alarm. This is a radar-based motion sensor.

Another type of motion sensors are photo-sensors and infrared sensors. In the first example it works by hitting a beam of light to a sensor. For example it can be fitted across a pass way between a door or a room. If a person is between the beam of light and its sensor, the alarm is triggered. This is also a very commonly used motion sensor alarm nowadays.

In the infrared sensor, which are more advanced, it triggers the alarm by detecting a higher temperature (output by a human for example), which will usually be higher than the ambient temperature in a house. Obviously it is not a good idea to use this type of alarm if you own a pet.

One thing is true, there’s never enough security to be implemented in your own house!


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