Fund Project: Anhui Provincial Department of Education Natural Science Research Project (K213Z316, K213Z317); Suzhou College Professor (Ph.D.) Research Startup Fund Project (213b02); Suzhou College Industry-University Research Project (2013cxy01), Suzhou University Master's Research Fund Project (2010yss01, 2009YSS07, 2009YSS08); Suzhou University's scientific research and modern society is a high-speed information age with rapid development of science and technology. People are feeling the great convenience and benefits brought by high technology. The streetlight control system based on 485 bus is rapidly developed based on the development of automatic identification technology. At present, the street lamp system developed and used at home and abroad is mainly embodied in the induction light and the artificial control system. The advanced intelligent street lamp control system is an important development trend of the current street lamp system. With the rapid popularization and development of computers, more and more control devices are gradually replaced by computers, and more and more systems are gradually developing towards the intelligent direction. 1 circuit design 1.1 lighting board circuit design is worth the size, the light intensity is large, the voltage in the circuit is reduced, through the comparison of the comparator, the output of the considerable control signal 23. As shown, the lighting board is connected with three 1001 (resistance , R3, R4 divided the voltage to half of 220V, R2 and the photoresistor are divided, the photoresistor is affected by the light, so that the voltage divided by R2 and the photoresistor is different, through the comparison of the comparator LM358, a control signal is output.

1.2 Slave design The slave machine plays a vital role in the whole process. The slave and the host are connected by RS485 converter. The slave is equipped with a dimming board and a lighting board interface, so that the host, the slave, and the lighting are used. The board and the dimming plate are harmonized into one unit.

The MAX232 is connected to the main unit for level conversion, and the MAX485 is used for the connection between the host and the slave. The PC fee 591 interface is used to connect the dimming board, and the lighting board interface can be directly connected to the lighting board. The slave plays a vital bridge position throughout the work process.

1.3 Dimming plate design setting The brightness of the street lamp can be determined by the 101 on the dimming plate (the potentiometer completes the task separately. When the color of the day is slightly dark, the street lamp will emit light. After a series of internal working operations, it will automatically adjust and finally reach normal work.

The control signal sent by the slave to the dimming board is output through the 15-pin of the PCF8591. After the optocoupler is applied, a DC signal is sent to the TCA785. The TCA785 chip outputs the sawtooth wave on the 10th pin, and the DC wave on the 11th pin is 10 The sawtooth wave of the pin is intersected, and the 1M color ring resistor is connected to the 5th pin, and the zero point is detected. A pulse is triggered at the intersection, and the approximately rectangular pulse is output by the 14th and 15th pins, and the two pulse signals are superimposed. Finally, the generated signal is transmitted to the BT139 thyristor. When the thyristor is turned on, the thyristor is turned on. When the external street lamp receives the control signal, the corresponding change occurs. In addition, the 12A pin of the TCA785 chip is connected with a 10K potentiometer. The resistance value of the potentiometer can directly control the brightness of the street light to achieve the purpose of real-time control.

1.4 host design chip, MAX485 is mainly used to connect with the slave, the MCU uses TTL level, the serial port uses RS232 level, MAX232 is used for level conversion 4, 5. The host and the slave are almost the same, all are composed of the minimum system of the MCU. MAX232 is used for level conversion. MAX485 is used to connect slaves. A row of LED lights is connected to the core board of the main unit. It corresponds to the external street lights. By observing the LED lights, the actual street lamp work is directly understood. If the LED lights are always flashing. The status indicates that the street lights are working normally. If the LED lights are always on or off, indicating that the street lights have failed, the maintenance personnel can actually repair the street lights by observing the LED lights of each slave. It can save manpower and make it easy for people to use.

2 485 bus-based street lamp control system based on 485 total line lamp control based on the traditional street lamp control developed by the lighting board, slave, dimming board and host and other parts.

As shown, the master and the slave are connected by RS485 converter, and each slave is connected with the street light. The system can control multiple real-time street lights, and the external light intensity affects the resistance of the photoresistor, thereby realizing the host street light. The control of the brightness and brightness of the light. The control of each street lamp is realized by a terminal or a host computer. You can arbitrarily specify the brightness and darkness of a certain street light, and the degree of light and darkness. According to the actual situation, you can set the street light to be fully bright, all off, semi-bright, and interval bright. (Each street lamp communicates with the switchboard of the switchboard system through the 485 bus). The street lamp control based on the 485 bus is provided with a row of LEDs on its center plate, and each LED corresponds to a real-time street lamp, which can prompt the working condition of the street lamp. If the LED light flashes completely to indicate that the street light is working normally, if the LED light is always on or off, it indicates that the street light has failed, which is convenient for the maintenance personnel to detect.

3 Conclusion With the rapid development of street lighting control applications, especially the automatic control of street lights, it represents the development trend of the whole intelligent society. Based on 485 total line light control is the combination of intelligent technology and communication technology, computer technology, hardware The compatibility is good, for example, it can be compatible with different types of street lamps in the same series; the hardware configuration requirements are relatively low, and automatic control is realized under unmanned conditions. The management program of this system can realize real-time monitoring. When someone performs legal or illegal operation, there is corresponding animation display.

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