In this project, we show the basic multilevel car parking system with two floors. Although we show the concept with two floors, it is still possible to show this concept on multiple floors. Also, in this project, we will show two floors with 4 sensors on each floor. The lift carries the car to each floor. Along with these 8 sensors, we use two separate sensors for each floor. With the help of these sensors, the lift stops automatically.
When we press a start switch, the lift automatically starts and immediately senses the space in the parking station. If the space is available, the lift will start or stop on particular floor, which is displayed in the LCD. If no space is available, the lift stops and displays the message “no space”.
If all the spaces are vacant, the lift will park the vehicle on priority basis.
The earliest known multi-storey car park was built in 1918. It was built for the Hotel La Salle in Chicago, IL at 215 West Washington Street in the West Loop area of downtown. It was designed by Holabird and Roche. The Hotel La Salle was demolished in 1976, but the parking structure remained because it had been designated as preliminary landmark status and the structure was located several blocks from the hotel it was built to service. The Hotel LaSalle multi-storey was demolished in 2005 after failing to receive landmark status from the city of Chicago. Jupiter Realty Corp. of Chicago is constructing a 49-storey apartment tower in its place, with construction underway as of March 2008.
Automated car parks rely on similar technology that is used for mechanical handling and document retrieval. The driver leaves the car in an entrance module. It is then transported to a parking slot by a robot trolley. For the driver, the process of parking is reduced to leaving the car inside an entrance module.
At peak periods a wait may be involved before entering or leaving. The wait is due to the fact that loading passengers and luggage occurs at the entrance and exit location rather than at the parked stall. This loading blocks the entrance or exit from being available to others. Whether the retrieval of vehicles is faster in an automatic car park or a self park car park depends on the layout and number of exits.
COMPLETE PROJECT IS TO BE DIVIDED INTO FEW PARTS:
In this project, we use 5 volt regulated power supply. For this purpose, we use a single step down transformer with full wave rectifier circuit. In the rectifier circuit, we use two diodes as a full wave rectifier. One 1000mfd capacitor is used as a filter capacitor to convert pulsating dc into smooth dc. Output of the rectifier is not regulated, so for regulated power supply we use IC 7805 as a regulator. Output of the 7805 regulator is connected to one led with a resistance in series. LED works as a power indication circuit.
Here the step down transformer used is a center tap transformer. We use center tap transformer in a full wave rectifier circuit.
In this project, we use a reed switch as a sensor. Reed switch is a special magnetic proximity sensor. When this reed sensor is activated by an external magnetic field, the reed sensor is activated automatically. In the reed sensor, there are two wires inside the glass casing. When an external magnetic field affects the sensor, these plates join together and become short automatically. We use this sensor in our project to sense the position of the car and of the lift on floor. When the lift moves, it searches the reed sensor for stoppage. We paste one magnet with the lift and when the lift move up-wards, then magnet searches the sensor. As the sensor is sensed by the magnet, the lift stops there automatically.
So whenever we want to stop the lift or check the position of the vehicle, we search the magnetic sensor. When any car is parked on the desired position, the sensor activates and provides a signal to the controller. The controller checks the change of voltage on this pin and saves this data for auto sensing logic.When sensor is active, the port pin becomes more negative and this change of voltage from high to low is our required signal.
Manual operation of school bell / college bell creates lot of disturbances caused by human errors. If the bell operator forgets to ring the bell for a specific period, or delayed to ring the bell, it creates disturbances for entire the institution. All the classes on that day will be completely disturbed. This problem is more present if the bell operator is on leave. Automatic Periodic College Bell is the only solution to avoid all these problems.
The Project AT89S8252 Microcontroller Based Automatic Periodic College Bell with RTC DS1307 Interfacing is an interesting project which uses AT89S8252 microcontroller as its brain. This project is very useful in schools, colleges and educational / academic institutions for automation of periodic class bell. This bell rings only at preprogrammed timings. As the DS1307 Real Time Clock chip is used, entire the calendar can be programmed into the microcontroller. User can program the bell to ring the bell from morning to evening and not to ring in after school hours and on Sundays and Second Saturdays. Micro Switches is provided for entering the required timings. This switches made this project user friendly. 16X2 LCD display is provided to display the alarm times and current time. DS1307 is interfaced to the microcontroller for real timing performance. A 3V battery can be connected to DS1307 to avoid time disturbances caused by power failures.
AT89S8252 has inbuilt flash EPROM. Data stored remains in the memory even after power failure, as the memory ensures reading of the latest saved settings by the micro controller. It can retain data for more than ten years. This project uses regulated 5V, 500mA power supply. Unregulated 12V DC is used for relay. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac out put of secondary of 230/12V step down transformer.