7-segment LED digital tube pin diagram - Solutions - Huaqiang Electronic Network

7-segment LED digital tube pin diagram (pin diagram)

The principle of LED illumination, people with a little electronic technology foundation are very clear, we do not want to make too many introductions, 7-segment LED digital tube, on a certain shape of insulation material, using a single LED combination arranged into "8" word Types of digital tubes, respectively, lead their electrodes, lighting the corresponding points to display the number 0-9.

According to the LED connection method, the LED digital tube is divided into two types: common yin and common yang. It is very important to understand these characteristics of LED, because different types of digital tubes, besides their hardware circuits, programming methods It is also different. The picture on the right shows the internal circuits of the common cathode and the common anode digital tube. Their principle of illumination is the same, except that their power supply polarity is different.

Connecting the cathodes of multiple LEDs together is a common cathode type, and connecting the anodes of multiple LEDs together is a common anode type. Taking the common cathode type as an example, if the cathode is grounded, a positive power source is connected to the anode of the corresponding section, and the section emits light. Of course, the current of the LED is usually small, and it is generally required to connect the upper limit current resistance in the loop. If we connect the "b" and "c" segments to the positive power supply and the other terminals to ground or hang, then the "b" and "c" segments will illuminate. At this time, the digital tube display will display the number "1". The "a", "b", "d", "e", and "g" segments are all connected to the positive power supply, and the other pins are left floating. At this time, the digital tube will display "2". The display principle of other characters is similar, and the reader can analyze it by himself.

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