Shu led digital tube tube two meters codeword two Shu Shu 0.5 meter digital word

led digital tube two digital Shu Shu Shu special digital meter digital control word 1, Product Name: two meters digital control word 2, word bits: 2 3, light colors: red; (other colors can be customized) 4. Polarity: common cathode / common anode 5, the surface color: black panels, gray panel 6, font color: red / green / blue / white / orange 7, colloid color: white 1 Introduction Digital tube is actually made seven segment LED-eight configuration, plus a decimal point eight. These segments respectively, by the letters a, b, c, d, e, f, g, dp expressed. When a particular segment LED voltage is applied, these particular segments will light up to form two 8 digital words of our eyes to see the tube. Such as: display a "2", then it should be a bright light b e g bright bright bright f d c does not light does not shine bright dp. LED digital tube have generally bright and super bright different points, there are 0.5 inch, 1 inch different sizes. Strokes small size digital tube display common one light emitting diode, and large-size digital tube is made of two or more light emitting diodes, under normal circumstances, a single light emitting diode voltage drop is about 1.8V, current does not exceed 30mA. The anode is connected to the light-emitting diode is connected to the positive supply together is called a total of Yang digital tube, light emitting diode cathode connected to the negative power supply connected together referred to as common cathode LED. Numbers and characters commonly used in LED digital display is 0,1,2,3,4,5,6,7,8,9, A, B, C, D, E, F. 2 structural principle led digital tube (LED Segment Displays) by a plurality of light emitting diodes are packaged together to form the "8" shaped device, the lead is connected internally done, just lead their respective stroke, a common electrode. led digital tube used is generally the number of segments plus a decimal point and some 7-segment, there is a similar three "+1" type. Median half position, 1,2,3,4,5,6,8,10 bits, etc. ...., led digital tube connection according to the LED divided into a total of yin and yang categories, understand LED These characteristics of the program is very important because different types of digital control, in addition to their hardware circuits are different, the programming is different. Figure 2 is a common cathode and common anode LED internal circuit, and their light-emitting principle is the same, but their supply polarity is different. Colors are red, green, blue, yellow and so are several. led digital tube is widely used in instruments, clocks, station, home appliances and other occasions. Pay attention to the selection of product size color, each stroke power, brightness, wavelength etc. are the corresponding letter indicates DP decimal point A, the static display driver: static drive, also known as DC drive. Static drive means for each digital code for each segment by a microcontroller I / O port to drive, or use as BCD code two - Decimal * is * driving. Static drive advantage is simple programming, high brightness display, the disadvantage is occupied by I / O port and more, such as drive five digital static display requires 5 × 8 = 40 根 I / O port to drive, you know a 89S51 microcontroller available The I / O Eloquence 32 yet. We must increase the actual application * drive for drive, increasing the complexity of the hardware circuit. B, dynamic display driver: digital dynamic display interface is one of the most widely used microcontroller, a display mode, increase public very COM bit strobe control circuit for each digital control, bit strobe I by separate / O line control, microcontroller for bit strobe COM side of the circuit control, the digital control of strobe control we just need to show the open, the bit on the show shape, no strobe light digital tube will not . Through sharing in turn control the COM terminal of each LED digital tube, it makes each turn controlled digital display, which is a dynamic drive. Digital lighting time per bit is 1 ~ 2ms, because the human persistence of vision effect phenomenon and afterglow light-emitting diode, and despite the fact that you are not at the same time digital tube lights, but as long as the scan fast enough to people the impression that a stable set of display data, there will be no light flashes, dynamic and static display effect is the same, can save a lot of I / O ports, and lower power consumption.