Since solar street lights are not connected to the power grid, it is difficult to switch the lights and the measurement and control of the lighting operation. At present, the switching lights of solar street lights are controlled by the voltage of the solar battery. The dispersion of solar cells under low light and the attenuation of dust and solar cells will cause errors in the switching time of solar street lights. This error will be very large; in addition, there are also anti-theft problems in uninhabited areas in rural areas, and street lamp failure inspections are all Very difficult.
Modern wireless network transmission technology is the best way to manage solar street lights in the future. As the scale of the city continues to increase, solar street lights in the city are also increasing. Solar street light switch control, anti-theft problems in uninhabited areas in rural areas, inspections of street lamp failures, networked and intelligent upgrades of existing equipment are imperative, and the search for a low-cost solution is in the upgrading of equipment The first consideration. This article introduces a wireless solar street light control system, which is an organic combination of advanced short-distance wireless communication (ZigBee) technology and modern intelligent network technology. It has the characteristics of flexible networking and low cost, and is especially suitable for network management of solar street lights. .
ZigBee technology is a short-distance, low-complexity, low-power, low-data rate, low-cost two-way wireless communication technology or wireless network technology. It is mainly suitable for carrying services with small data traffic and can be embedded in various devices. At the same time, it supports geographic positioning. Compared with various existing wireless communication technologies, ZigBee technology is the technology with the lowest power consumption and cost, and it is also a hot spot in embedded applications. ZigBee technology has the following characteristics.
Low power consumption: Due to the low transmission rate of ZigBee, the transmission power is only 1mW, and the sleep mode is adopted, and the power consumption is low, so ZigBee devices are very power-saving. It is estimated that the ZigBee device can last up to 6 months to 2 years with only two AA batteries, and its power consumption is far less than other wireless devices.
Low cost: The initial cost of the ZigBee module is around US$6, and it is estimated that it will soon be reduced to US$1.15~2.15, and the ZigBee protocol is royalty-free. Low cost is also a key factor for ZigBee.
Short delay: The communication delay and the delay of activation from the sleep state are very short. The typical search device delay is 30ms, the sleep activation delay is 15ms, and the active device channel access delay is 15ms, so ZigBee technology It is suitable for wireless control applications with demanding delay requirements (such as industrial control occasions, etc.).
Large network capacity: A star-shaped ZigBee network can accommodate up to 254 slave devices and a master device, and the network composition is flexible.
Reliability: A collision avoidance strategy is adopted, and a dedicated time slot is reserved for communication services that require a fixed bandwidth to avoid competition and conflicts in sending data. The MAC layer uses a fully confirmed data transmission mode. Each data packet sent must wait for the receiver’s confirmation message. If there is a problem in the transmission process, it can be retransmitted.
Security: ZigBee provides a data packet integrity check function based on cyclic redundancy check (CRC), supports authentication and authentication, and adopts an AES-128 encryption algorithm. Each application can flexibly determine its security attributes.
These characteristics of ZigBee make it very suitable for solar street light control systems. ZigBee is a wireless data transmission network platform composed of up to 65535 wireless data transmission modules. Within the entire network, each ZigBee network data transmission module can communicate with each other, and the distance between each network node can be from Standard 75m unlimited expansion. Each solar street light equipment is connected wirelessly through the ZigBee module, so that the entire ground solar street light management system establishes a real-time, accurate, and efficient comprehensive solar street light management system that works in a large range and all-round.
Modern wireless network technology will be applied in the field of solar road lighting. The networked and intelligent upgrade management of functions such as solar street light switch control, street light anti-theft in rural unmanned areas, and street light fault inspection is imperative.