Parallel parking is an ordeal for many drivers, but with parking space limited in big cities, squeezing your car into a tiny space is a vital skill. It's seldom an easy task, and it can lead to traffic tie-ups. Fortunately, technology has an answer - cars that park themselves. Imagine finding the perfect parking spot, but instead of struggling to maneuver your car back and forth, you simply press a button, sit back, and relax. The same technology used in self-parking cars can be used for collision avoidance systems and ultimately, self-driving cars. That is what our project is all about.
Automakers are starting to market self-parking cars because they sense a consumer demand. The cars are equipped with parking sensors but they only guide the driver and help him park the car.
Our project is a step ahead of this. When you request for a self parking service, the sensors take the control of the car and park
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Self-parking cars can help to solve some of the parking and traffic problems in dense urban areas. Sometimes parking a car in a space is restricted by the driver's skill at parallel parking. A self-parking car can fit into smaller spaces than most drivers can manage on their own. This makes it easier for people to find parking spaces, and allows the same number of cars to take up fewer spaces. When someone parallel parks, they often block a lane of traffic for at least a few seconds. If they have problems getting into the spot, this can last for several minutes and seriously disrupt traffic.
Finally, the difficulty of parallel parking leads to a lot of minor dents and scratches. Self-parking technology would prevent many of these mishaps.
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The self parking car sensor works on the principle of echo. The car to be parked using the self parking technique is taken into the parking lot and the system for self parking is started by pressing a button. It then starts searching for a parking space. Whenever there’s a car besides it, it senses it and keeps on moving forward until it finds an empty space. When it does, a counter placed in the system starts counting till the dimensions of the car and keeps sensing the output at every fourth step. If no obstacle is found till it completes counting for the dimensions of the car, then the counter is reset back to its initial value and the parking process starts. The left wheel becomes stationary and the right wheel starts reversing at 90 degrees. It then moves back and parks the car.
The ultrasonic transmitter used here is operated at 40Khz with nearly 50% duty cycle. The frequency is generated using IC 555 in astable mode. The output is given to an ultrasonic transmitter.
The reciever is used to detect the reflected sound. The output of an ultrasonic transducer is given to the input of a non inverting amplifier with a gain of 221. The amplified signal is then given to the rectifier which rectifies the amplified sound wave. The RC filter is connected in cascade with the rectifier. The RC filter has time constant RC greater than 1/40k sec=2.5*10-5 sec. the output of RC filter is a stable DC voltage which is then given to a comparator which gives 1 as an output when an object is detected and 0 when no object is detected.
