To make an LED electronic display, you first need to understand the components: unit board, power supply, control card, wiring, switching power supply and LED strip screen control card. The following editor will introduce the basic information of LED electronic display related accessories separately for your reference.
The unit board is one of the core components of the LED display. The quality of the unit board directly affects the display effect. The unit board is composed of LED module, driver chip and PCB circuit board. The LED module is actually a dot matrix in which many LED light-emitting points are encapsulated with resin or plastic. The driver chip is mainly 74HC595 74HC245 / 244 74HC138 4953. The common unit board specifications for indoor strip screens are: parameters: D = 3.75; dot pitch 4.75mm 64 dots wide x 16 dots high, 1/16 sweep indoor brightness. Explanation of single red / red and green color parameters: luminous diameter: refers to the diameter of the luminous point D = 3.75mm luminous point distance 4.75mm â€”â€”According to the distance of the viewer, generally choose 4.75 indoor unit board size: 64x16-most Commonly used unit boards are the easiest to buy and the cheapest. 1/16 scan: the control method of the unit board. Indoor brightness: refers to the brightness of the LED light-emitting point, indoor brightness is suitable for environments that rely on fluorescent lighting during the day. Color: Single red, the most commonly used, and the cheapest price. Two-color generally refers to red and green, and the price is high. If you want to make a 128x16 dot screen, you only need to connect two unit boards in series.
The power supply generally uses a switching power supply, 220V input, 5V DC output. It should be pointed out that since the LED electronic display screen is a precision electronic device, a switching power supply should be used instead of a transformer. For a single red indoor 64x16 unit board, the current is 2A when it is fully lit. Inference, the current is 8A when the 128x16 two-color screen is fully lit. 5V10A switching power supply should be selected.
We recommend the use of a low-cost strip screen control card, which can control a 1/16 scan 256x16 dot two-color screen, which can assemble the most cost-effective LED screen. The control card is an asynchronous card, that is, the card can save information when power is off, and can display the information stored in it without connecting to a PC.
When purchasing a unit board, please ask for clear parameters. The 100% compatible unit boards are: 08 interface 4.75mm point distance 64 point width x16 point height, 1/16 sweep indoor brightness. Single red / red and green two-color 08 interface 7.62mm point distance 64 points wide x16 points high, 1/16 sweep indoor brightness. Single red / red and green two-color 08 interface 7.62mm point distance 64 points wide x16 points high, 1/16 sweep half outdoor brightness.
Divided into data lines, transmission lines, and power lines. The data line is used to connect the control card and the cable of the LED unit board, and the transmission line is used to connect the control card and the computer. The power cord is used to connect the power supply and control card, power supply and LED unit board. The diameter of the copper core of the power cord connected to the unit board is not less than 1mm (mm)
The cable (data cable) production cable is similar to the data cable in the computer case, but the width of the cable is slightly different. Related materials can be bought in the computer city. To make a cable, a tool is needed, which is a special pliers (picture), which can greatly improve work efficiency and yield. The materials for making the cable are: cable, cable head, cable cap. It should be noted here that if you make a 16PIN (16-wire) cable, you need to buy a 16PIN cable and a corresponding-sized cable head and cap. In the production process, cut the end of the thread with scissors, and then put the head of the cable, (pay attention to the balance of the wire and the head), then put it in the center of the crimping pliers, press firmly, and then wrap the wire around and install the cable cap. The cable cap is very important, which can effectively protect the cable and make the cable more sturdy. Don't save it.
The power supply is divided into 220V power cord and 5V power cord. The 220V power cord is used to connect the switching power supply to the city power. It is best to use a 3-pin plug, which can be purchased at a hardware store. Here we focus on the power line of 5V DC. Because the current of 5V is relatively large, it is best to use a red-black pair with a copper core diameter of more than 1mm (be sure to use red and black). If possible, it is best to install metal parts on both ends of the wire.
â€¢ Single Stage controllers:
This type of controllers prevents battery overcharging by switching the PV array off when the battery voltage reaches the state of charge set point. The array and battery are automatically reconnected when the battery voltage reaches a lower value called the charge resumption.
â€¢ Pulse Width Modulation (PWM) controllers:
PWM controllers are the most common controller on the market today. These charge the battery by rapidly switching the full charging current on and off when the battery reaches a fully charged state. The length of the charging current pulse gradually decreases as battery voltage rises, reducing the average current into the battery.
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