Design And Implement Of Car Reversing Aid System Based On S3C44BOX

Car Reversing Aid System is designed to assist the driver while parking. It can be used to avoid collision between cars ,car and nearby building and also between car and people because cars crowded the road street garage and parking lots.In this thesis ,Ultrasonic Pulse Distance-Measurement Car Reversing Aid system is designed ,based on the theory of radar pulse distance-measurement .This Back a car Radar system can be used while low-speed parking to identify obstacles that lay at the rear of the car.It can also measure the distance between the car and the obstacle and alarm the driver with light and sound before collision. It can also alarm the passenger to avoid collision at the same time.The input/output footprint PA0 of S3C44B0X control the oscillate circuit generates ultrasonic whose frequency is 40KHz, amplied and emitted by the launching circuit,and the timer start to time at the same time .Emission ultrasonic can be echo,when meet stumbling. After receiver depend on emitter passes ultrasonic,employ inner resonance ,via soud and electricity conversion action will make sound energy conversion become to electicity impulse,then input signal amplifier ,finally enable the external interrupt , the inner timer0 stop to time .Ultrasonic measure distance is get across detect ultrasonic beamed then fall across stumbling block and reflected ,accordingly infer the beam and incept the difference time of wave t , then entreat the distance L=(1/2), in the model v is the velocity of ultrasonic.The design of analog circuit contains two parts, ultrasonic emitter circuit...