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7-segment displays are very often used to display integers, decimals, and hexadecimals, since they can read at least letters from "A" to "F". These displays provide a clear and powerful display.

Check out my Youtube video : Les Afficheurs 7-Segments (Multiplexage)

These 7-segment displays are composed of 8 LEDs (7 for segments and 1 for point). The LEDs are integrated into the component so that integers, decimals or hexadecimals can be displayed since they can display certain alphabetic characters, especially letters from "A" to "F". On the market there are also displays containing 14 segments that allow the display of all alphanumeric characters (alphabetic and numeric) as well as more complex symbols. Whatever the number of segments that make up the display, the electronic control is done by the multiplexing method.

This method consists in activating successively and in rapid sequences, one display at a time so as to intelligently use retinal retentivity. On a device comprising 4 displays, at the first time the first display will be activated, then the second display will be activated, then the last one will be activated before the loop is resumed.

To display the value of a variable, we need to decompose the number into digits that will be displayed on each display of the electronic device, respectively.

The project to illustrate this theory is composed of a quadruple 7-segment display and the multiplexing is implemented to provide a counter that increments from 0000 to 9999. The counter is not synchronized on the time- clock. It simply increments each time the program has performed a certain loop 5 times in a row. It is a very simple project which serves to demonstrate that it is absolutely necessary to multiplex the displays to be able to read the value of the counter on a quadruple display.

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