3 Common Types of Car Alarm Sensors

Car alarms offer benefits based on the sensors they include. In this short post will cover 3 common types of car alarm sensors, including: shock sensor monitors, door and window sensor monitor and voltage sensor.

Shock Sensor Monitors
In the last section, we looked at door sensors, one of the most basic car alarm systems. These days, only the cheapest car alarm packages rely on door sensors alone. Advanced alarm systems mostly depend on shock sensors to deter thieves and vandals.
The idea of a shock sensor is fairly simple: If somebody hits, jostles or otherwise moves your car, the sensor sends a signal to the brain indicating the intensity of the motion. Depending on the severity of the shock, the brain signals a warning horn beep or sounds the full-scale alarm. Source: Auto.HowStuffWorks

Door and Window Sensor Monitors
All security systems have door sensor monitors. Less sophisticated alarms mainly rely on the car door sensors. These sensors monitor the voltage being transmitted throughout the car. When the level drops, it indicates that something has been interfered with. For example, when the car door opens, it depresses a sensor, which causes a light to come on. When another sensor is combined with this, it informs the “brain ” that the door has been opened. If a prospective thief attempts to steal the vehicle by opening a door, it sets off the alarm. It is a simple system, but requires a door to be opened in order to trigger the alarm. If a thief breaks a window or removes the hubcaps, no alarm is sounded.
A window sensor monitor triggers the siren when the window is broken. The alarm is triggered by a microphone in the computer. It is programmed to detect and interpret the sound of breaking glass. Source: eBay

Voltage Sensors
The most basic alarms use a single voltage sensor to determine when a theft or break-in attempt is being made. This sensor monitors the static voltage of the car’s electrical system and triggers the alarm when it senses a drop in voltage, such as when a door or trunk is opened and the interior lights go on. Attempting to start the car or cut the power will also trip the voltage sensor. Source: eHow

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