Ah, five rings, you have one more ring than the four rings;
Ah, five rings, you have one less ring than the six rings...;
A song "The Song of the Five Rings" sings the "Xin Lu" course of the Beijingers. In the face of increasingly congested urban roads, is there any smart traffic that gives us a green light?
In the face of the crossroads of urban congestion, in the face of a fleet of cars that don’t look at the head, do you miss the road of “doing you� Have you ever looked at the green light at the crossroads and turned red but only waited in line. On the way to work, you can only go to the heart but you can only travel slowly. Because of congestion, you lose your driving passion.
In fact, our country has been striving to promote the development of intelligent transportation, vigorously rectify road traffic order, and promote the construction of road traffic safety facilities. When it comes to intelligent transportation, what is the specific?
The brain of the intelligent traffic management system is the traffic command center, and the command center manages multiple subsystems. Each subsystem has its own independent functions and cooperates with each other. These subsystems are built on top of the hardware devices, which are mainly composed of controllers and some detection devices.
Intelligent Transportation System Overall Solution Block Diagram
The entire intelligent transportation system is more complicated and complicated. Let us talk about the most common traffic lights today. The main function of the traffic signal control system is to control the red, yellow, green and pedestrian red and green lights of the motorized lights, the forbidden working hours, and the automatic execution control settings.
The intelligent signal light control system can automatically adjust the corresponding pass and forbidden time according to the traffic volume of different intersections or the same intersection at different time intervals. It plays an important role in maintaining traffic order, improving the traffic rate at intersections, and avoiding traffic accidents at intersections.
With the rapid development of wireless technology, the era of the Internet of Everything is coming, many domestic enterprises have launched intelligent traffic control system solutions based on wireless technology, and achieved a good social response.
The advantages of using wireless communication compared to traditional wired methods are more prominent:
1. Consumables cost: Traditional wired control systems such as traffic lights need to bury buried power lines underground and lay multiple signal lines. The wireless transmission mode only needs to be connected to the original power system to take power, and the signal line does not need to be additionally laid, and saves a lot of manpower and mechanical use costs.
2. Construction loss: Traditional wired traffic signals are mostly found on newly built roads. For additional traffic lights or post-reconstruction projects that have been used, road damage is large and construction is difficult. Wireless has more obvious advantages for such projects, and it is simple and convenient to add or renovate projects.
3, troubleshooting and maintenance: For the maintenance or maintenance of the later projects, wireless maintenance is convenient, equipment replacement is easier, and the cable is related.
4. Construction impact: The wireless reconstruction or overhaul period is short, and the impact on the road is small. Compared with the long-term road closure necessary for wired construction, it has little impact on the public and is highly safe.
Currently used in the intelligent transportation industry wireless transmission solutions, more mature are mainly zigbee, LoRa two, today mainly introduce zigbee communication solutions.
Zigbee technology is a short-range, 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. Support for geolocation at the same time.
Zigbee wireless is widely used
Compared with the existing wireless communication technologies, zigbee technology is a low-power and cost-effective technology, and 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 maximum emission current is only 148mA, and the sleep mode is adopted, the power consumption is low, so the zigbee device is very power-saving. It is estimated that the zigbee device can last up to 6 months to 2 years using only two 5th batteries, and its power consumption is much smaller than other wireless devices;
Low cost: The initial cost of the zigbee module is around $3, and the zigbee agreement is royalty-free. Low cost is also a key factor for zigbee;
Short delay: The communication delay and the delay 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. Therefore, zigbee technology is suitable for applications with time-critical wireless control (such as industrial control applications);
The network capacity is large: a star-shaped zigbee network can accommodate up to 254 slave devices and one master device, and the network composition is flexible. For example, the Zhizi Electronics Fastzigbee protocol supports the self-organizing network function;
Reliable: A collision avoidance strategy is adopted, and dedicated time slots are reserved for communication services requiring fixed bandwidth, avoiding competition and collision of transmitted data. The MAC layer uses a fully acknowledged data transmission mode, and each transmitted packet must wait for the acknowledgement from the receiver. If there is a problem during the transmission, retransmission can be performed;
Security: zigbee provides a packet integrity check based on Cyclic Redundancy Check (CRC), which supports authentication and authentication. Encryption algorithms are used, and each application can flexibly determine its security attributes.
Intelligent traffic signal light wirelessly
ZLG Zhiyuan Electronics has developed a series of low-power, high-performance zigbee modules based on the NXP JN5168 wireless microcontroller, providing a complete application integration solution based on the IEEE802.15.4 standard ISM band.
The products have been inspected and certified by a series of authoritative RF instruments, combined with years of market experience and the actual needs of users in the industry, the wireless product's extremely complex communication protocol is integrated into the built-in MCU, simplifying and simplifying, greatly simplifying the complexity of wireless products. The development process enables your products to quickly enter the market at a lower cost, increase competitiveness, and better grasp the opportunities.
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