In the long night, the street lights illuminate the road ahead. When the night falls, the street lights will light up. As the number of pedestrians on the road increases, the darker the street lights will be brighter. When entering the middle of the night, the number of pedestrians will decrease. The street lights began to darken, saving energy for urban lighting.
Figure 1: Light adjustable
So how does the street light control the brightness coordination work? The following figure is a schematic diagram of the overall system of the streetlight control system. At each streetlight node, the first-level terminal equipment transmits the road condition and environmental information to the secondary terminal ZigBee concentrator through ZigBee wirelessly, and through it, the signal is converted into the public network. The GPRS signal is finally passed to our management center. The management center personnel make corresponding control according to the transmitted signal, and adjust the brightness and brightness of each node.
Figure 2: Intelligent Street Light System
This is our primary terminal, each streetlight node consists of ZigBee wireless module, core control board, light and flow sensor and LED light. Each node receives commands through ZigBee, and reports the status of each street light in real time, brightness adjustment, transmission of energy load status, completion of lamp damage alarm and leakage alarm, receiving query commands from ZigBee concentrators, control commands, etc. .
Figure 3: Street light node
This is the secondary terminal ZigBee concentrator. It consists of ZM5161 module, Iot-3960 industrial control board and GPRS-DTU. It is mainly used to convert ZigBee signal and GPRS signal and transmit it to the control center through the public network.
Figure 4: Node Concentrator
Here is the control center, which consists of server, large-screen projection display device, street lamp intelligent measurement and control system software, WEB server, printer and other equipment. It is responsible for real-time monitoring of road conditions and surrounding environment information uploaded by the first-level terminal, querying work records and street lights. Effective real-time control.
Figure 5: Street Light Management Center
Overall advantage:
1. Replace the cable with wireless, greatly reducing wiring complexity and cable costs;
2. Wireless public network transmission mode, which can realize complex networking and ultra-long distance monitoring;
3. It can work in a variety of modes, and automatically adjust the brightness with sensors such as light sensitive and human flow, effectively increasing the energy utilization rate;
4. Improve road lighting quality, reduce energy consumption, and achieve green lighting;
5. FastZigBee networking protocol has more nodes available, high transmission efficiency, stable performance, and simple secondary development.
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