CN203013210U - Solar expressway intelligent electronic screen display system based on AVR - Google Patents

Abstract

The utility model discloses an AVR-based intelligent electronic screen display system for solar energy highways. The intelligent electronic screen display system includes a first functional area and a second functional area; the first functional area is provided with a first main controller, a solar main power supply module, an LED display module, an LCD adjustment module and a clock module; the second The second functional area is equipped with a second main controller, a solar auxiliary power supply module and an ultrasonic sensor for detecting whether there is vehicle passing information; the first functional area communicates with the second functional area in a wireless manner. The utility model cooperates with solar panels and ultrasonic sensors to realize the intelligent control of the electronic display screen of the expressway, which meets the requirements of energy saving, consumption reduction, low carbon and environmental protection in the intelligent management system of the expressway; at the same time, the intelligent electronic display system Stable performance, high real-time performance, energy saving, environmental protection, and good application prospects.

Description

AVR-based intelligent electronic screen display system for solar highways

technical field

The utility model relates to an AVR-based intelligent electronic screen display system for solar energy highways.

Background technique

At present, LED electronic display screens are widely used in information prompt signs on expressways. As a new generation of information display tools, LED electronic display screens show great charm with their incomparable advantages. However, there are the following problems in practical application: ①LED electronic display screen consumes a lot of power and consumes and burns fossil energy to cause air pollution; ②The traffic flow on the expressway is relatively small, and the current all-weather working mode of LED electronic display screen does not meet the current requirements. energy-saving requirements; ③The highway mileage is long, and the long-distance laying of power supply cables increases the cost of the project.

Utility model content

The purpose of the embodiment of the utility model is to propose an AVR-based solar highway intelligent electronic screen display system, which can effectively solve the above-mentioned technical problems existing in the actual application process of the LED electronic display screen.

In order to achieve the above object, the utility model adopts the following technical solutions:

The AVR-based solar highway intelligent electronic screen display system includes the first functional area and the second functional area; the first functional area is equipped with a first main controller, a solar main power supply module, an LED display module, an LCD adjustment module and Clock module; the second functional area, which is equipped with a second main controller, a solar auxiliary power supply module and an ultrasonic sensor for detecting whether there is vehicle passing information; the first functional area and the second functional area communicate wirelessly .

In the above-mentioned AVR-based solar highway intelligent electronic screen display system, the distance between the first functional area and the second functional area is 180 meters to 220 meters.

In the above-mentioned AVR-based solar highway intelligent electronic screen display system, the wireless communication method is composed of a wireless receiving module arranged in the first functional area and a wireless sending module arranged in the second functional area.

In the above-mentioned AVR-based solar energy highway intelligent electronic screen display system, the first master controller adopts the ATMega128 series AVR microcontroller, and the output terminal of the wireless receiving module is connected to an external interrupt pin of the ATMega128.

In the above-mentioned AVR-based solar highway intelligent electronic screen display system, the LCD adjustment module is connected to the I/O interface of the ATMega128.

In the above-mentioned AVR-based solar highway intelligent electronic screen display system, the second main controller adopts ATMEGA8 series single-chip microcomputer.

In the above-mentioned AVR-based solar highway intelligent electronic screen display system, the solar main power supply module and the solar secondary power supply module have the same structure, and are internally provided with a solar battery panel, a DC/DC step-down circuit, a pulse charging circuit, and a lithium battery protection circuit. circuit, lithium battery and synchronous rectification boost circuit.

The utility model has the advantages of:

The AVR-based solar highway intelligent electronic screen display system mentioned in the utility model cooperates with solar panels and ultrasonic sensors to realize the intelligent control of the highway electronic display screen, which is in line with the energy saving and consumption reduction in the highway intelligent management system. Carbon environmental protection requirements; at the same time, the intelligent electronic screen display system has stable performance, high real-time performance, energy saving, environmental protection, and has a good application prospect.

Description of drawings

Fig. 1 is the structural block diagram of the intelligent electronic screen display system based on AVR in the utility model embodiment;

Fig. 2 is the structural representation of main solar power supply module in Fig. 1;

Fig. 3 is the control flow diagram of the first functional area in the utility model embodiment;

Fig. 4 is a control flow diagram of the second functional area in the embodiment of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

As shown in Fig. 1 and Fig. 2, the AVR-based solar highway intelligent electronic screen display system includes a first functional area 1 and a second functional area 2; the first functional area is internally provided with a first main controller, a solar main Power supply module, LED display module, LCD adjustment module and clock module; the second functional area is equipped with a second main controller, a solar secondary power supply module and an ultrasonic sensor for detecting whether there is vehicle passing information; the first functional area and Communication between the second functional areas is carried out in a wireless manner. The wireless communication mode is composed of a wireless receiving module set in the first functional area and a wireless sending module set in the second functional area.

The first main controller is responsible for collecting the information of wireless reception, LCD adjustment module and clock module, and making corresponding adjustments to the LED display module after processing. The main solar power supply module and the secondary solar power supply module store solar energy and use it as energy for the entire display system. The LED display module displays time and prompt information. The LCD adjustment module sets the parameters of the display system through buttons. The clock module provides current time.

The working principle of the display system mentioned in the utility model is:

Set up an ultrasonic sensor at a distance of 200 meters from the LED electronic display screen. When no vehicle passes by, the time for each ultrasonic emission and return remains unchanged. The ultrasonic sensor will not send a signal to the first master controller. At this time, the LED electronic display The LCD screen is in the off state, and there is no vehicle and the current time is displayed on the LCD screen; when a vehicle passes by in the 200-meter area, the time for ultrasonic emission and return becomes shorter. At this time, the ultrasonic sensor first transmits a signal to the second main controller, which The second main controller makes a command, sends a signal to the first main controller through the wireless sending module, when the first main controller receives this signal, it first displays the time on the LED display screen and then swipes the screen to display the prompt information, and The time when there are vehicles passing by and the LED screen is lit is displayed on the LCD screen. The energy of the whole system is provided by the solar main power supply module and the solar auxiliary power supply module. When the external light is strong, part of the electric energy converted by the solar energy is used as the energy of the system, and part is stored in the lithium battery; when the external light is weak, the system All energy is provided by lithium batteries.

The first main controller adopts ATMega128, a high-end 8-bit AVR single-chip microcomputer of Atmel Company, which has 64 pins, 128K bytes of in-system programmable Flash, 4K bytes of SRAM and 4K bytes of EEPROM, 53 General-purpose I/O port line, supports functions such as interrupt, timer and analog-to-digital conversion, supports ISP download, JTAG debugging, and its function is powerful enough to meet the requirements of this design.

The output terminal of the wireless receiving module is connected to an external interrupt pin of ATMega128, and the interrupt function of ATMEGA128 is used to receive the vehicle detection signal sent by the ultrasonic detection module. When this signal is received, the interrupt is triggered, and the time and prompt are displayed on the LED At the same time, use the analog-to-digital conversion function of ATMEGA128 to detect the brightness of the surrounding environment, make real-time adjustments to the brightness of the LED electronic display screen according to the brightness of the surrounding environment, use the I/O port of ATMEGA128 to receive the key adjustment information of the LCD adjustment module, and timely Adjust the various parameters of the system; in addition, ATMEGA128 is also used to collect the timing information of the clock module to update the information on the LCD screen in time.

The wireless receiving module adopts the domestic CC1100 wireless data transmission module, and uses the wireless module with the CC1100 radio frequency chip as the node to realize data transmission. When the CC1100 wireless receiving module receives data information, first let the CC1100 enter the receiving state. If we receive a set of data within the set time, a high and low level pulse can be detected on GDO2. Thus, an interrupt is triggered, and the first byte of data in the buffer received by CC1100 is read out. This data is the length of the data currently received by CC1100. If this length is the length of the data you want to receive, you can start to read all the data in the CC1100 receive data buffer.

LED display module is mainly composed of LED electronic display and CH452. ATmega128 controls the LED display screen through CH452 to refresh the screen to display the current time and safety prompt information. In addition, ATmega128 can adjust the graded brightness after analog-to-digital conversion according to the current external light intensity.

CH452 is a digital tube display driver and keyboard scan control chip. CH452 can exchange data with MCU through cascadable 4-wire serial interface or 2-wire serial interface, and can provide power-on reset signal to MCU. The utility model adopts the method of cascading the 4-wire serial interface to drive 16 pieces of 8*8 LED dot matrix to realize the refresh display.

The clock module adopts DS1302 real-time clock module. DS1302 is a high-performance, low-power real-time clock circuit with RAM launched by DALLAS Company of the United States. Timing, with leap year compensation function, working voltage is 2.5V ~ 5.5V. The module is mainly composed of DS1302 clock chip and DS32KHZ temperature-compensated crystal oscillator. It is used to provide system time, as well as storage and adjustment of time information.

The second main controller adopts ATMEGA8, a high-performance, low-power 8-bit AVR microprocessor of ATMEL Company, with 28 pins. There is no reduction in specific functions, and its internal FLASH and SRAM are sufficient for this module. At the same time, the use of ATMEGA8 saves costs and simplifies the circuit design.

The ultrasonic sensor has four external pins, VCC, GND, Echo echo signal output, and Trig trigger control signal input. In the utility model, the ATMEGA8 I/O pin continuously inputs a 10us trigger signal to the ultrasonic Trig, and the ultrasonic sensor automatically emits ultrasonic waves. When a vehicle passes by, the ultrasonic wave receives an echo signal, and the echo signal output port Echo outputs a high signal. Level, and then count the time interval between the ultrasonic emission and the echo signal in the program, and save this time, and the ATmega8 will calculate and process the position of the car in the lane, and display it on the 12864 LCD; When there is no vehicle passing by in the area, no echo signal returns after the ultrasonic wave is emitted, ATMEGA8 does not deal with it, and the ultrasonic sensor continues to emit ultrasonic waves.

The wireless transmission module also adopts the CC1101 digital transmission module. When the utility model adopts the digital transmission module, when there is no vehicle passing by on the road, the wireless transmission module is in a suspended working state; when there is a vehicle passing on the road, it is detected and generated by the ultrasonic sensor. The echo signal is input to the main control ATMEGA8, and after ATMEGA8 inquires about the signal, it starts the wireless sending module to send data information to the outside. When CC1100 sends data, it first writes the number of bytes of data to be sent from the I/O port, then writes the data to be sent, and finally writes the sending enable command, and CC1100 starts sending data. When it is detected that GD02 generates a pulse, the sending is successful. If there is no action on GD02 within a certain period of time, it means that the sending has failed. After the sending is completed, clear the data in the CC1100 sending buffer.

The solar main power supply module and the solar auxiliary power supply module have the same structure, and are equipped with solar panels, DC/DC step-down circuits, pulse charging circuits, lithium battery protection circuits, lithium batteries and synchronous rectification and boosting circuits. These two modules mainly convert solar energy into electrical energy and provide continuous 5V uninterrupted power supply for the entire smart electronic screen display system.

Figure 3 shows the control flow diagram of the first functional area. After power-on, the initialization operation is carried out, including the initialization of ATMEGA128 timer and interrupt, the initialization of LED display, the initialization of LCD display and the initialization of real-time clock chip DS1302. After that, the main program starts to run. First, the corresponding system information is displayed on the LCD screen, including the current system time, whether there is a vehicle passing by, and the time when the LED screen is on. Then detect the brightness of the surrounding environment in order to make corresponding adjustments to the brightness level of the LED screen. Then check whether the LCD adjustment module has an adjustment action, including the adjustment of the system function and the adjustment of the time. If there is an action, adjust the corresponding parameters, and display the adjusted information on the LCD, and then judge the vehicle flag, otherwise Directly enter the stage of judging the vehicle sign position. The vehicle flag is completed in the interrupt. When the first main controller receives the information sent by the ultrasonic sensor, it will set the vehicle flag. After a period of time, the flag will be cleared. During the time period when the flag is 1 Indicates that there is a car in the area, and the time and prompt information will be displayed on the LED screen, and then return to the LCD screen display stage again, otherwise directly return to the screen display stage.

Figure 4 shows the control flow diagram of the second functional area. After power-on, the initialization operation is performed, including the initialization of ATMEGA8 timer and interrupt, the initialization of ultrasonic sensor and wireless transmission working state. After that, the main program starts to run, and the ultrasonic sensor continuously emits ultrasonic waves. When the return signal is received, the time-varying interrupt is triggered, and the time of transmission and reception is counted during the interruption. If the sampling time becomes shorter, it means that there is a car in the area. At this time, the information is written into the wireless transmission through the program, and the information is sent to the first main controller through the wireless transmission module, otherwise, continue to detect the vehicles in the area.

Of course, the above descriptions are only preferred embodiments of the present invention, and the present invention is not limited to the above embodiments. It should be noted that any person skilled in the art can make All equivalent replacements and obvious deformation forms fall within the essential scope of this specification and should be protected by the utility model.

Claims (7)

1. The AVR-based solar energy highway intelligent electronic screen display system is characterized in that it includes a first functional area and a second functional area; the first functional area is internally provided with a first main controller, a solar main power supply module, and an LED display Module, LCD adjustment module and clock module; the second functional area, which is equipped with a second main controller, a solar auxiliary power supply module and an ultrasonic sensor for detecting whether there is vehicle passing information; between the first functional area and the second functional area communicate wirelessly. 2 . The AVR-based intelligent electronic screen display system for solar highways according to claim 1 , wherein the distance between the first functional area and the second functional area is 180 meters to 220 meters. 3. The AVR-based intelligent electronic screen display system for solar energy highways according to claim 1, wherein the wireless communication mode consists of a wireless receiving module arranged in the first functional area and a wireless receiving module arranged in the second functional area. The wireless transmission module is composed. 4. the intelligent electronic screen display system based on AVR according to claim 1, is characterized in that, described first master controller adopts ATMega128 series AVR single-chip microcomputer, and the output terminal of wireless receiving module is connected to one of ATMega128 on the external interrupt pin. 5. the intelligent electronic screen display system based on AVR according to claim 4, wherein the LCD adjustment module is connected to the I/O interface of the ATMega128. 6. The intelligent electronic screen display system based on AVR for solar energy highways according to claim 1, wherein the second main controller adopts ATMEGA8 series single-chip microcomputers. 7. The intelligent electronic screen display system based on AVR according to claim 1, wherein the main solar power supply module and the secondary solar power supply module have the same structure, and the inside is provided with a solar panel, a DC/DC drop Voltage circuit, pulse charging circuit, lithium battery protection circuit, lithium battery and synchronous rectification boost circuit.

Images