Car alarm circuit

  
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A car alarm in its simplest form, needs to be nothing but one or more sensors connected to some sort of siren. The very simplest alarm would have a switch on the driver`s door, and it would be wired so that if someone opened the door the siren would start wailing. Real world alarms have typically more sensors and controls. The center of the system is often called `brain`.
Car alarm circuit - schematic

The "brain" can be anything from a quite simple electronics circuit (few ICs) up to a small computer (most adavnced systems). . The brain`s job is to look for state of the sensors and activate alarm devices (your horn, headlights or an installed siren) when alarm is needed. Alarm is started when certain switches that power sensing devices are opened or closed. Security systems differ mainly in which sensors are used and how the various devices are wired into the brain. This is a remake of the alarm "cobra" for a car. The alarm cobra was very famous in the 1995, it was widely sold in supermarkets. This design is a remake of that alarm. This remake allows the user to change all the sounds, times, etcs. The original design did not have any options for those and all the the cars had the same sound.



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