LED street light monitoring system based on GSM and power carrier communication

With the advancement of urbanization, the role of street lamps in people's lives has become more and more prominent, and it also reflects the development level of a city. The power consumption of a street lamp system in a city is quite huge. Today, energy conservation and environmental protection have become the theme of the times. It is urgent to improve the energy utilization rate of street lamp systems. 2. At present, LED street lamp intelligent monitoring system is more integrated with ZgBee technology. The centralized control method or the distributed control method adopts the shortcomings of high cost, complicated protocol and low communication efficiency, although the system requirements are met to some extent. In order to solve these problems, this paper introduces power carrier communication technology and applies ant colony algorithm to narrow-band power carrier communication network, which provides an effective method for dynamically finding optimal route, extending communication distance and improving communication reliability. 3. 1 system structure design The structure of the street lamp monitoring system based on GSM and power carrier communication technology is as shown. The monitoring system consists of a power carrier communication network and a remote monitoring center. The power carrier communication network is composed of multiple street light control terminals, which collects the light intensity, sound size and infrared parameters in real time. All the data is finally transmitted to the street lamp centralized controller through the carrier communication network, and the data is transmitted by the centralized controller of the street lamp through the GSM network. Forwarded to the remote monitoring center, which is responsible for receiving, storing, and analyzing data.

2 street lamp control terminal hardware design The main function of the street lamp centralized controller is to realize the transmission of commands and the reception of data. It is mainly composed of power carrier communication module, processor module and GSM module. 4. In addition to completing data forwarding, the street lamp control terminal must also Control sensors to collect environmental information in real time, due to fund projects: National Natural Science Foundation of China (11205022) Sichuan Science and Technology Support Program Project Funding Project (011GZ0190) Communication Contact: Lei Lin (1964-), male, Mianyang, Sichuan Professor, Ph.D., Chengdu University. E-mail: sdence168163.com This node also contains a variety of sensor modules, the structure of the street light control terminal node is as shown.

The microprocessor module is based on Hongjing's STC12C2052AD microprocessor, featuring high speed, low power consumption and superior anti-interference. S-C12C2052AD has four 16-bit timers, eight 8-bit precision ADCs, SPI synchronous communication support and 15 general-purpose I/O interfaces. These interfaces are connected to control circuits, sensors and power carrier communication modules.

The power carrier communication module adopts KQ130F+ of Sichuan Keqiang Electronic Technology Co., Ltd., including carrier drive, coupling, filtering, lightning protection and many other complicated peripheral circuits. The module has an operating frequency of 120135 kHz and an interface baud rate of 9600 bit/s. It has anti-interference and anti-attenuation characteristics, and the transmission distance can reach 2km. It satisfies the requirements of street lighting control. The processor exchanges data and sends commands to the power carrier module via the Rx and D pins.

The sensor module and the infrared sensor module are composed of a high-performance infrared current pyroelectric processing chip BISS0001 with a pyroelectric infrared sensor RE200B and other peripheral components. It has a wide voltage range, a voltage range of 0.56V, and an operating temperature of 1070°C. RE200B is a new type of sensitive component that is made of a high thermoelectric coefficient material with a filter lens and an impedance matching field effect transistor. composition. It can detect infrared radiation from people or vehicles in a non-contact manner, convert it into electrical signal output, and effectively suppress other interference radiation. Its working wavelength is 714Mm, and the working angle of the flat viewing angle 138 is 12524. The main component of the sound sensor module is a sound-sensitive capacitive electret microphone. The sound waves cause the electret film in the microphone to vibrate. Change, and produce a small voltage corresponding to it. This voltage is amplified by processing and converted to a voltage of 05V, which is compared with the threshold voltage and passed to the MCU for processing. The output impedance of the capacitive electret microphone is 15kn, and the frequency response line fault detection module is mainly composed of LSCT-01 current transformer. The rated input current of the current transformer is 5A, the rated output current is 5mA, and the ratio is 1 000:1; when the load is 100n, the phase difference is less than 20% linear range 07A. The current transformer output AC small current signal is amplified and converted into an AC voltage signal, which is rectified and filtered from the non-inverting input of the operational amplifier. The input is amplified by the operational amplifier and passed to the MCU. When the output voltage is higher than 5V, to ensure that the pin is not damaged, the output voltage is limited to 4.7V by connecting the Zener at the output.

3 system software design Because power carrier communication is easily interfered by noise and has obvious attenuation, the transmission distance of power carrier is generally 200300m without using relay. In LED streetlight network, each streetlight centralized controller needs to be controlled quite All the street lights in the large area, but the nodes far away from the centralized controller of the street light can not communicate directly with them, that is, the communication between the nodes in the area cannot be guaranteed to reach one hop. Therefore, the appropriate routing algorithm is needed to select the relay node. All nodes in the area are formed into a power carrier network, and data transmission and command forwarding between nodes are implemented through the network. In this paper, the ant colony algorithm is applied to the power carrier communication network, and the next hop node is selected according to the cost and delay of each link to establish an efficient and reliable route, and finally find the optimal from the source node to the destination node. path. Electrical Measurement and Instrumentation, 2006, 43 (8): 54-57. Xu Chaoqun, Gao Mingqi. Application of low-voltage power carrier communication technology in remote intelligent monitoring of urban street lamps. Telecommunications Technology, 2006, 46 (6): 145-149. Liu Zhu, Wang Xiaoyan, Cai Shilong. Low-voltage power line carrier communication networking method. Power System Communications, 2009, 30 (12): 17-20. Lin Ke, Yan Zhisong, Sun Chunfeng, et al. Health monitoring system design based on power line communication technology. Journal of Guangxi Normal University: Natural Science Edition, 2013, 31(2): 45-50. Li Bing, Jiang Bo, Wang Binyu. Application of BISS0001 on pyroelectric infrared switches. Applied Science, 2006, 33 (2): 31-33. Yu Tianbai, Yang Jiangxin, Zhao Yuxi. Power line carrier communication routing algorithm in building control systems. Power grid technology, 2006, 30 (9): 8-91. Huang Min, Yu Ting, Zhong Sheng, and so on. The improved ant colony algorithm is used to solve the continuous space optimization problem. Journal of Guangxi Normal University: Natural Science Edition, 2013, 31(2) 34-38. (Responsible Editor Li Xiaoling)