How traffic lights work | high power traffic light
The traffic lights are equipped with induction control, and vehicle detectors are set on the entrances of intersections. The traffic signal timing scheme is calculated by a computer or an intelligent signal control machine. It is a control method that can be changed at any time with the traffic information detected by the detector. The basic method of induction control is induction control at a single intersection, referred to as single-point control induction control. Single-point sensing control can be divided into semi-sensing control and full-sensing control depending on the setting of the detector. Regarding the transportation system as an uncertain system, it can continuously measure its status, such as traffic flow, number of stops, delay time, queue length, etc., gradually understand and master the object, and use the difference to change the adjustable parameters of the system or produce a control . Extended information: history At the beginning of the 19th century, in York City in central England, red and green outfits represented the different identities of women. Among them, the woman in red indicates that I am married, while the woman in green is unmarried. Later, horse-drawn carriage accidents frequently occurred in front of the Houses of Parliament in London, England, so people were inspired by red and green outfits. On December 10, 1868, the first member of the signal light family was born on the square of the House of Parliament in London; The lamppost designed and manufactured by De Hart, a British mechanic at the time, was 7 meters high, and hung a red and green lantern-a gas traffic signal light. This was the first signal light on a city street. At the foot of the lamp, a policeman holding a long pole pulled the belt to change the color of the lantern as he wanted. high power traffic light
Read MoreThe working principle of sports LED display
The working principle of led display (1) System composition This system is composed of computer special equipment, display screen, video input port and system software. Computer and special equipment: Computer and special equipment directly determine the function of the system, and different types can be selected according to the different requirements of users on the system. Display screen: The control circuit of the display screen receives the display signal from the computer, drives the LED to emit light to produce the picture, and outputs sound by adding power amplifiers and speakers. Video input port: Provide a video input port. The signal source can be a video recorder, a DVD player, a camera, etc., and it supports multiple formats such as NTSC, PAL, and S_Video. System software: Provide special software for LED playback, powerpoint or ES98 video playback software. (2) System function The system has the following functions: With the computer as the processing control center, the electronic screen corresponds to a certain area of the computer display (VGA) window point by point, the display content is synchronized in real time, the screen mapping position is adjustable, and the size of the display screen can be easily and freely selected. The display dot matrix adopts ultra-high brightness LED light-emitting tubes (red and green dual primary colors), 256 levels of gray, 65536 color combinations, rich and vivid colors, and supports VGA 24-bit true color display mode. Equipped with graphic information and 3D animation playback software, it can play high-quality graphic information and 3D animation. The playback software can display information in more than ten forms, such as covering, closing, opening the curtain, alternating colors, and zooming in and out. Using special program editing and playing software, you can edit, add, delete and modify text, graphics, images and other information through different input means such as keyboard, mouse, scanne
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How to wire the led billboard light? What to do if the led billboard is not bright?
1. How to wire led billboard? 1. Plug wiring: The plug outlet is to open the outlet hole from the middle of the plug pieces at both ends of the led linear lamp, which will be very convenient to install. The plug outlet cannot be seamlessly connected, and the aesthetics is slightly inferior to that of the bottom outlet. 2. Side wiring: Choose one of the two sides of the led linear lamp to punch an outlet hole equivalent to the wire diameter. The waterproof pairing wiring is connected to the circuit board from this hole. Its advantage is that it can be seamlessly connected. , The brightening effect has no dark areas, and the installation is very convenient. 3. Bottom wiring: the bottom wiring is drilled from the bottom of the two ends of the led linear lamp aluminum profile with a wiring hole equivalent to the wire diameter. The principle is the same as that of the side, which can make the wiring hidden in the bottom position, which is more beautiful. high. 2. What to do if the led billboard is not bright? 1. Leakage. There is a slight leakage in the installation site. When creating the word, the line does not run smoothly, the connector is poorly connected, the second word starts to have a leakage part, and the wiring cabinet tape is opened and grounded. 2. Because the transformer power supply is too small, use a normal necessary transformer. Please use a different transformer according to the size of the word. We use two power supplies (transformers), for example, one word for the first four, one word for the remaining four, and one power supply for the remaining four. Two wiring can solve this problem. It is best to arrange a bit thicker. 3. The arrangement of the lights is uneven. Maybe there are too many LEDs on the road. This can't be done too much. Please contact the manufacturer of the lamp for how many specific belts each has. There are too many straps in some places, too bright in some places, and too little in some places, and the b
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Features of floodlights | led stadium floodlight
The LED floodlight is a point light source that can illuminate uniformly in all directions. Its illumination range can be adjusted arbitrarily, and it appears as a regular octahedron icon in the scene. Floodlights are the most widely used light source in the production of renderings. Standard floodlights are used to illuminate the entire scene. Multiple floodlights can be used in the scene to produce better results. Floodlights are the most widely used light source in renderings. Multiple floodlights can be used in the scene to coordinate their effects to produce better results. It is to illuminate the object uniformly in all directions from a specific point. It is best to use it to compare a light bulb and a candle. Floodlights can be placed anywhere in the scene. For example, it can be placed outside the camera's range or inside an object. It is common to use many different colored floodlights in the scene at a distance. These floodlights can cast shadows and mix them on the model. Due to the large range of floodlights, the illumination effect of floodlights is very easy to predict, and there are many auxiliary uses of this kind of light. For example, if the floodlight is placed close to the surface of the object, it will be on the surface of the object. It produces a bright light. It should be noted that floodlights cannot be built too much, otherwise the renderings will appear flat and dull. Therefore, in the usual rendering of renderings, pay more attention to the impact of lighting parameters and layout on the light perception of the entire renderings scene, accumulate more experience, and master the lighting matching skills. Features of floodlights: Under small current, the temperature rise of LED flood light is not obvious. If the ambient temperature is high, the dominant wavelength of the LED floodlight will be red-shifted, the brightness will decrease, and the uniformity and consistency of the luminescence will deteriorate. In particular
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What is the difference between LED flood light and LED flood light | high mast led floodlight
LED floodlights are also called spotlights, spotlights, spotlights, etc. They are mainly used for architectural decoration lighting. And commercial space lighting, the decorative components are heavier, and the appearance is round or square, because it usually has to be tested Considering the reason of heat dissipation, there are still some differences between its appearance and traditional floodlights. LED flood light classification: 1. Rotationally symmetrical shape The luminaire adopts a rotationally symmetrical reflector, and the symmetry axis of the light source with rotationally symmetrical light distribution is along the reflector axis Line installation. The iso-intensity curves of this type of lamps are concentric circles. When this type of spotlight is illuminated by a single lamp, the illuminated surface Obtain an elliptical spot with uneven illumination; however, when multiple lamps are illuminated, the spots are superimposed on each other, which can produce satisfactory Lighting effect. For example, hundreds of rotationally symmetrical floodlights are commonly used in stadiums, which are installed on high towers around the stadium. Above, get high illuminance, high uniformity lighting effect. 2. Two symmetrical plane shapes The iso-intensity curve of this type of projector has two symmetry planes. Most of the lamps use symmetrical cylindrical reflectors, and The linear light source is installed along the cylindrical axis. 3. A symmetrical plane shape The isobaric intensity curve of the luminaire has only one symmetry plane (Figure 2). The lamps are made of asymmetric cylindrical reflectors Or a symmetrical cylindrical reflector plus a grid that restricts light. The most typical is the sharp cut-off block retracted light distribution. This kind of light A single lamp with strong distribution can obtain a more satisfactory illuminance distribution. 4. Asymmetrical shape The iso-intensity curve of this t
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