The environment inside the tunnel will bring some special problems to the safety of the train and the health of passengers and maintenance workers. This is mainly due to the temperature and humidity, the content and accumulation of harmful gases in the tunnel. Therefore, understanding the environmental conditions in the tunnel and taking corresponding measures will help protect the health of the people.
1.2 Project Background / MotivationSince most of the tunnels are closed passages, there is no guardrail. Without natural light, the illumination in the tunnel can only be provided by lighting equipment. When a person enters the tunnel during the day, the intensity of the light inside and outside the tunnel varies greatly, and the human eye cannot adapt immediately. There will be a “black hole effect†when entering the hole and a “glare effect†when the hole is out. Temperature, humidity and harmful gases can also cause harm to people's health.
Second, the demand analysis 2.1 functional requirementsMeasure real-time information about the tunnel environment: temperature, humidity, light intensity, noxious gases, and video information.
2.2 Performance requirementsThe real-time nature of the data, accuracy.
Third, the program design 3.1 system function realization principleThe tunnel environment monitoring system built by AVR32 processor has the advantages of high integration, convenient networking and low cost. The entire system uses the EVK-1100 development board, while collecting ambient temperature and humidity, CO concentration, lighting and video information, and displaying this information through the 4&TImes;20 blue LCD. When an indicator exceeds the standard, the audible and visual alarm will sound an alarm. These data can be transmitted to the monitoring center through a serial communication module and an Ethernet module.
Figure 1 system hardware block diagram
Figure 2 hardware architecture
3.2 Hardware platform selection and resource configurationThe hardware architecture of Figure 2 uses a 32-bit AVR EVK1100 is an evaluation kit based on the AT32UC3A0.
Use on-board resources: temperature, light sensor, 4&TImes; 20 blue LCD display, Ethernet interface, serial port module, SD/MMC card, etc.
3.3 system software architectureAs shown in Figure 3, the system first collects external environmental information: temperature and humidity, lighting information, harmful other information, and video information. The collected data is displayed on the LCD display on the board in real time and stored in the SD card for later data analysis. When the information exceeds the set threshold, an audible and visual alarm is used to alert. Finally, the video information is transmitted to the monitoring center through the Ethernet module.
3.4 System Software Process
Figure 3 program running flow chart
3.5 system is expected to achieve resultsComplete the general structural design and apply it to the actual project.
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