With the development of the national economy, the number of car ownership of urban residents has increased sharply. The contradiction between cars and parking spaces has become more and more prominent in crowded urban areas. Especially on holidays, parking spaces are the most troublesome problem. Therefore, how to make full use of the limited parking lot resources to meet the parking requirements of vehicles to the greatest extent has become an urgent problem for the society. At present, the problem of the parking space guidance system is that the number of parking spaces that can be managed by the system is small, and the parking space information between different parking lots cannot be effectively communicated. If the owner does not find a suitable parking space in a parking lot, he cannot quickly know the parking space information of other recent parking lots. Moreover, in recent years, for the intelligent parking lot, the research on the parking space guidance system has focused on the indoor parking lot. The indoor parking lot products have been perfected, but there are few people paying attention to the outdoor parking lot. Many indoor parking lot management systems are open to the outdoor. It does not apply. For example, most parking space guidance systems use red and green lights to indicate whether there is a vehicle in the parking space. It is easy to observe indoors and can be found far away. When it is illuminated outdoors, the lights are not easy to be found. It is indistinguishable, and indoor ultrasonic inspection installation is complicated, and it is not easy to achieve indoors. Therefore, the system was developed to solve a series of large-scale open-air temporary parking problems and car-seeking problems.
2, system composition and functionThe system consists of an inductive terminal, a display terminal and a mobile APP. As shown in Figure 1. The sensing terminal is controlled by STM32F103, including ultrasonic Sensor, digital tube, two-color indicator light, switch, buzzer and NRF24L01 wireless communication module. The display terminal is controlled by STM32F103, including TFT color screen and NRF24L01 wireless communication module. The mobile app is a software developed by AndroidStudio that specifically looks for a car park.
Figure 1 System overall architecture
2.1, sensing terminalWhen an object blocks the ultrasonic module of the receiving part, the information is quickly transmitted to the display through the nRF24L01 wireless module. Based on this principle, we can put the receiving part in front of the parking space and put the display terminal in the parking lot door. When the vehicle enters the parking space, the front ultrasonic sensor detects the vehicle, the buzzer sounds an alarm, and the digital tube of the sensing terminal displays the parking space number, so that the owner can easily find the car when the owner leaves, the two-color indicator light changes from yellow to red, and the data is transmitted to the door. On the display terminal, the display screen displays the position information and possession information of the parking space in real time.
2.2, display terminalThe display terminal of the system has strong portability and good transmission effect with the sensing terminal, so the display terminal can be placed at the parking lot door. When the vehicle is opened to the parking lot door, the owner can quickly understand the parking space location information and possession information through the observation display, so that the empty parking space can be quickly and efficiently found.
2.3, mobile APPWhen the owner leaves, the owner can quickly find his car by remembering the number displayed on the digital tube through real-time positioning and route navigation through the mobile APP. There is also a search route function, the owner only needs to click the starting point and the end point on the mobile phone to come out to accurately navigate the route, which helps the owner to better understand the parking lot. as shown in picture 2.
Figure 2 Mobile APP diagram
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