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Flex sensor is an unique and sensitive
component of car black box which changes resistance on bending. It changes its
resistance when the sensor is press due to force and this sensor will embedded
in car paint. And this sensor is connected to controller through ADC.
·
In this system LM35 temperature sensor
is use to record temperature of vehicle i.e. cabin temperature and engine
temperature and it is also connected to controller through ADC. And its output
voltage is linearly proportional to Celsius.
·
The 3 axis sensor i.e. Accelerometer
which is use to sense tilting of car or vehicle. It senses the current position
of that system by taking its X-axis, Y-axis and Z-axis coordinates. This sensor
connected to ADC which will connect the sensor to microcontroller.
·
The values which are sensed by the all
parameters are displayed on LCD. And for that 16 x 2 alphanumeric LCD is use.
The LCD can be mounted on dash board of car which will be more convenient for
driver of the car.
·
All these above sensors are at same priority
level when this sensor goes above fix threshold microcontroller starts
operating means it sends message via GSM transmitter.
·
Microcontroller Needs
+5V DC for its operation so 230V AC is stepped down to 9V AC, then rectified
using four 1N4007 diodes (connected in full wave bridge rectifier
configuration). Then this DC as it is pulsating need to be smoothened, so a
large value electrolytic capacitor is used for filtering. LM7805 (+5V voltage
regulator) is used to provide constant +5V DC even if we have voltage
fluctuation in 230V AC
·
This system should be mounted in
one box which should be tough and
compact as possible as for the protection of all above sensors and it should be
easily fixed in car.
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