working of car overheating alarm pdf
#1

hi I need circuit diagram for car overheating alarm using 8051 microcontroller
Reply
#2

A car alarm is an electronic device installed in a vehicle in an attempt to discourage theft of the vehicle itself, its contents, or both. Car alarms work by emitting high-volume sound (usually a siren, klaxon, pre-recorded verbal warning, the vehicle's own horn, or a combination thereof) when the conditions necessary for triggering are met, as well as by flashing some of the vehicle's lights, and (optionally) notifying the car's owner via a paging system and interrupting various electrical circuits necessary for the car to start.
OEM alarms[edit]
Almost all OEM alarms are typically armed and disarmed with the vehicle's keyless entry remote. On many vehicles the key cylinders in the driver or front passenger door activate switches, so that when a key is used in the door the alarm will arm or disarm. Some vehicles will arm when the power door lock switch is pressed with the driver's door open, and the door is subsequently closed. Some vehicles will disarm if the ignition is turned on; often when the vehicle is equipped with a key-based immobilizer and an alarm, the combination of the valid key code and the ignition disarms the system.

Aftermarket alarms[edit]
Like OEM alarms, aftermarket systems are usually armed and disarmed via remote. Usually they do not have provisions for external disarming from the key cylinder, but will typically have an override switch mounted in a hidden location.

Alarm triggers[edit]
The individual triggers for a car alarm vary widely, depending on the make and model of the vehicle, and the brand and model of the alarm itself (for aftermarket alarms). Since aftermarket alarms are designed to be universal (i.e., compatible with all 12-volt negative ground electrical systems as opposed to one carmaker's vehicles), these commonly have trigger inputs that the installer/vehicle owner chooses not to connect, which additionally determines what will set the alarm off.

OEM alarm triggers[edit]
Generally, OEM alarms monitor the doors and trunk/hatch for unauthorized entry. On some vehicles this is done through pin switches, mercury switches, or microswitches integrated into the latch. On others, the doorlock mechanisms have switches built into them. Some OEM alarms additionally will trigger if the hood is opened, or if the ignition is turned on. Additionally a few systems have a shock sensor which will trigger upon a significant impact to the vehicle's body.

Aftermarket alarm triggers[edit]
The simplest aftermarket alarms are one-piece units with a siren and control module. The most common type of sensor is a shock sensor and two wires (12-volt constant power and ground) which are connected to the car's battery. This type of alarm is triggered by vibration transferred to the shock sensor, or by voltage changes on the input (the alarm assumes that a sudden change in voltage is due to a door or trunk being opened, or the ignition being turned on); however it is very prone to false triggers on late-model vehicles with many electronic control modules, which can draw current with the ignition off.

More sophisticated aftermarket alarms are wired into the vehicle's electronics individually. Typically, these alarms have inputs for power and ground, as well as for positive- and negative-switched door open circuits, negative trunk and/or hood circuits, and ignition-switched circuits to detect the ignition being turned on; aftermarket alarms also usually have a shock sensor which may be built into the control module or external to it.

In addition, some aftermarket alarms have provisions for optional sensors (these must be purchased separately). The tilt sensor can sense the vehicle being tilted (alerting to towing). Tilt sensors come in digital or mercury. A digital sensor is more accurate since it sets itself, allowing for the vehicle to be placed on a hill and not cause false triggers. A sound discriminator or glass breakage sensor senses only the sound of glass breaking. Typically, a sound discriminator sensor can be eliminated using a shock sensor. Proximity, infrared, or motion sensors sense motion inside or outside the vehicle; these are typically installed on convertible or T-top vehicles.

The sensors mentioned here are usually adjustable in order to avoid false alarms. For example, a shock sensor will sometimes vibrate due to a loud noise in the area, or an accidental bump to the car from a passerby. Proximity sensors can cause false alarms in parking lots when a passerby is entering or exiting a vehicle parked next to the armed car. These can cause the alarm to falsely sense an attempted break-in.

By design, some alarms will bypass some or all of the inputs at times. Other alarms can bypass some of their inputs via a button combination on the remote, or when remote starting (if the alarm supports this feature).
Reply

Important Note..!

If you are not satisfied with above reply ,..Please

ASK HERE

So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page
Tagged Pages: car overheating alarm project circuit,
Popular Searches: car alarm security system seminar project, transformer overheating detection ppt, engine overheating alarm images files download, engine overheating air conditioningengine overheating under load, fabrication of system for engine overheating indication, car overheating alarm circuits, engine overheating troubleshooting,

[-]
Quick Reply
Message
Type your reply to this message here.

Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  Over Speed Alarm Indicators of Electrical Motor with Digital RPM Indicator 0 250 25-07-2023, 05:33 AM
Last Post:
  dramatically working order know-how and retention of viva voce 0 654 11-10-2019, 08:59 AM
Last Post:
Information working principles of escalator 0 1,139 18-02-2019, 04:38 PM
Last Post:
  Earthquake detection alert alarm for people security ppt 0 864 06-01-2019, 09:29 AM
Last Post:
  Earthquake detection alert alarm for people security 0 784 06-01-2019, 09:25 AM
Last Post:
  fire alarm project for class xii pdf 0 1,180 31-10-2018, 08:37 PM
Last Post: Guest
  advantages and disadvantages mains failure alarm circuit in pdf 0 780 01-10-2018, 11:48 PM
Last Post: Guest
  full seminar report autonomous car 0 522 05-08-2018, 10:47 AM
Last Post: Guest
  full seminar report autonomous car 0 554 05-08-2018, 10:47 AM
Last Post: Guest
Tongue engine overheat alarm pdf 0 535 04-08-2018, 08:32 AM
Last Post: Guest

Forum Jump: