In recent years, with the rapid growth of China's national economy, electronic information products have developed by leaps and bounds, and various electronic information products have penetrated into various fields of society, bringing convenience to people's lives. However, while electronic products bring convenience, convenience and efficiency to people's lives, they also have problems of excessive consumption of existing energy and environmental pollution. Therefore, how to use technological innovation and vigorously develop environmentally-friendly and energy-saving electronic products has become an electronic The primary issue in the information industry. This project is to use this solar energy technology to configure energy supply and integrate innovative thinking in this environment, effectively achieving the goal of environmental protection, energy conservation and innovation.
1.2 Project Background / MotivationAt present, LED electronic display screens are widely used in highway information signs, as a new generation of information display tools LED electronic display shows its great charm with its unparalleled advantages. However, the use of LED electronic display on the highway has the following problems: 1 LED electronic display consumes a large amount of electricity, in order to ensure the normal display effect of the LED electronic display, in most cases, it is necessary to generate sufficient electricity by burning a large amount of fossil energy. , causing environmental pollution; 2 the traffic volume on the expressway is relatively small, the current all-weather working mode of the LED electronic display makes it still work when there is no vehicle passing, causing unnecessary energy loss; 3 highway mileage is long, around The environment is empty, and each LED electronic display must be powered by a long-distance power supply cable, increasing the cost of the project.
In order to meet the requirements of environmental protection and innovation, this design is based on ATMEGA128 single-chip microcomputer, with solar panel and ultrasonic sensor to realize intelligent control of high-speed road electronic display. In the design, solar energy is converted into electric energy by solar panels as the energy of the whole set of equipment, which achieves the purpose of environmental protection. At the same time, innovative thinking is incorporated into the design, and the ultrasonic sensor is used to detect the vehicle at a certain area of ​​the distance screen, thereby realizing the “in the areaâ€. There is a car screen bright, no car screen off, and achieved the purpose of innovation. The design will also adjust the brightness of the electronic display by 16 levels according to the brightness of the surrounding environment.
Second, the demand analysis 2.1 functional requirements1. The entire system is powered by solar energy and does not require an external power supply;
2. The vehicle in a certain area is tested, and the car screen is bright, and no car screen is off;
3. Real-time brightness adjustment of the display according to the brightness of the external environment;
5. Built-in LCD and keyboard for function adjustment;
2.2 Performance requirements1. The system runs continuously for 10 days in a non-lighted environment;
2. Reliable detection of small vehicles with speeds below 200km/h;
3. The content of the electronic screen can be clearly read under any light intensity;
4. Time accuracy of ± 2 minutes / year;
Third, the program design 3.1 system function realization principle
Figure 1 System block diagram
Figure 1 shows the block diagram of the system. It can be seen from the block diagram that the system can be divided into two parts: 1 The upper part is composed of solar power sub-module, ATMEGA8, ultrasonic sensor and wireless transmission. The whole upper part is called ultrasonic detection module; 2 the lower part is composed of ATMEGA128, wireless receiving, solar power supply module, LED display module, LCD adjustment module and clock module, the whole lower part is called the main control module.
The functions of each part of the design are as follows: 1 ATMEGA128 is responsible for collecting information of wireless receiving, LCD adjusting module and clock module, and making corresponding adjustments to the LED display module after processing; 2 ultrasonic detecting module detecting 200 vehicles at distance from LED electronic screen The situation sends the corresponding information to the main control module; 3 the solar power supply module stores the solar energy as the energy of the whole system; 4 the LED display module displays the time and prompt information; 5 the LCD adjustment module sets the parameters of the system through the button; 6 clock module Provide current time.
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