The common cathode digital tube connects all the cathodes of the led to the common contact com, and the anodes of each led are a, b, c, d, e, f, g and dp (decimal point), as shown in the following figure. The eight LEDs in the figure correspond to the segments a~dp in the above figure, and the numbers are displayed by controlling the lighting of each LED.
2. Application of common cathode digital tubeA common cathode digital tube is a type of digital display that, by inputting a relatively constant current to its different pins, causes it to illuminate, thereby showing that the number can display all available numerical parameters such as time, date, and temperature. Because of its low price, simple use, it is widely used in electrical appliances, especially in the field of home appliances, air conditioners, water heaters, refrigerators, etc. Most water heaters use digital tubes, and other home appliances use LCD screens and fluorescent screens.
3. Judging method of common cathode digital tubeEditors look for public sympathy and public yang: First, we find a power supply (3 to 5 volts) and a 1k (several hundred ohms) resistor, vcc connected to a resistor and gnd connected to any 2 There are a lot of combinations on the feet, but there is always a led will shine, find one is enough, then gnd does not move, vcc (string resistance) touch the remaining feet one by one, if there are multiple led (generally 8) Then it is the common shade. Instead of using vcc to move, gnd touches the remaining feet one by one. If there are multiple leds (usually 8), then it is common. You can also use a digital multimeter directly. The red pen is the positive pole of the power supply, and the black pen is the negative pole of the power supply.
Common anode digital tubeThe common digital tube refers to a digital tube that connects the anodes of all the light-emitting diodes together to form a common anode (COM). The common anode digital tube should connect the common pole COM to +5V when applied. When the cathode of a field LED is low, the corresponding field will light up. When the cathode of a field is high, the corresponding field is not lit.
Common anode 8 segment digital tube display circuit diagramDynamic Scan Display: The following figure shows the dynamic scan circuit diagram of 6 common anode LEDs. In the figure, port B of 8155 is connected to all dp(sp), g, f, e, d, c, b, a leads, and each LED control terminal G (ie, 0, 1 inside each digital tube shown in the figure) , 2, 3, 4, 5) is connected to the C port of the 8155, so the B port is a letter port, and the C port is a word port, because the CPU can control whether each LED is lit through the C port.
Looking for public sympathy and public yang: First, we find a power supply (3 to 5 volts) and a 1K (several hundred ohms) resistor, VCC connected to a resistor and GND connected to any 2 feet There are a lot of combinations, but there is always one LED that will illuminate. Finding one is enough, then GND does not move, VCC (string resistance) touches the remaining feet one by one, if there are multiple LEDs (generally 8), Then it is the common shade. Instead, use VCC to move, GND touches the remaining feet one by one. If there are multiple LEDs (usually 8), then it is common. You can also use a digital multimeter directly. The red pen is the positive pole of the power supply, and the black pen is the negative pole of the power supply.
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