7 Segment Led Display (Common Cathode)
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7 Segment Led Display (Common Cathode), is a form of an electronic display device for displaying decimal numerals that is an alternative to the more complex dot matrix displays.
In a common cathode display, all of the LED segment cathode connections are connected to logic "0" or ground. Individual segments are illuminated by applying a "HIGH" or logic "1" signal to the individual Anode terminals via a current limiting resistor (a-g).
Read more: Implementation of 7 segment LED display Controller on FPGA
Seven-segment displays or ( 7 segment displays) are widely used in digital clocks, electronic meters, basic calculators, and other electronic devices that display numerical information. If you want to use a 7 Segment Led Display in your Arduino project, then you will need a few components like breadboard , jumper wires , resistors , capacitors and transistors.
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In a common cathode 7 segment display, all the cathodes of the LEDs are linked together. Each LED is accompanied by a current-limiting resistor connected between it and the +VCC. In this configuration, to activate a specific LED, it is connected to +5V. Thus, by connecting inputs a to g to VCC, digits ranging from 0 to 9 can be displayed. For instance, to display the digit 3, LEDs a, b, c, d, and g will emit light, while the remaining LEDs will remain inactive. Consequently, the illuminated LEDs will take the form of the digit 3.
| Device type | Seven Segment Display |
| Display type | LED Display |
| Pin number | 10 |
| Pin type | DIP |
| Dimension | 19mm x 12mm x 7mm |
| Weight | 5 grams |
In a common cathode display, all LED segment cathode connections are connected to logic "0" or ground. Individual segments are illuminated by applying a "HIGH" or logic "1" signal to the individual Anode terminals via a current limiting resistor (a-g).
A 7 segment display consists of seven distinct illuminating segments. These are arranged in a way to form numbers and characters by displaying different combinations of segments. These seven segments are used to display binary data.
Put your multimeter's black lead on pin 3 or 8. Both are common pins as they are internally connected. Now connect the red lead of your metre to any other pin, such as 1 or 5. If any of the display's segments glow then the display is a common cathode
The primary distinctions between common anode and common cathode are as follows:
The 74LS47 or 7447 is a popular IC used to drive common cathode 7-segment displays. It acts as a BCD-to-7-segment decoder/driver IC.
A common cathode is a negative side. when we talk about a common cathode configuration, it means that the cathode terminals of all the LEDs in the display are tied together and connected to the ground (negative voltage). This makes the cathode the common terminal shared by all segments.
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