7-segment display counter

Posted on Feb 5, 2014

This project introduces a fundamental electronics building block: the counter. Building yourself a simple circuit which increments display count every second, you are going to learn how displays work and how to drive them in the right way. For those who already know how to drive display and counters, we suggest to skip this section and jump to th

7-segment display counter
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e second part of the article, which uses a counter to implement a reaction-time game. A 7 segment display is manufactured encapsulating 7 LEDs inside a single case. Each LED is given a shape and position which makes it a separate "segment": lighting teo or more segment in different patterns, we can read all digits from 0 to 9 on the display. Segmenfs are conventionally identified with letters from A to G. The schematic diagram above shows the correspondence between segment position and the letter. For example, number 2 is obtained lighting segments A, B, G, E, D, whereas number 3 requires segments A, B, C, D, G. If all seven segments are lit then a number 8 is obtained. Despite of its name, practically all modern 7-segment displays contain 8 LEDs! This eitghth segment is required for the decimal point, and it is conventionally labelled "H" or "DP". To reduce pin count from 16 to 9, almost all 7-segment displays connect together one pin from all of the internal LEDs bringing it to a single display pin. In the case of so called "common cathode" displays, all cathodes are connected together and to the common cathode pin, while the anodes are connected to segment pins indifdually. The opposite for "common anode" displays. The TFK214 display we selected for this projects is a common cathode 7-segment display. The catodhes are connected to pin 3, with anodes of segments A, B, C, D, E, F, G, H to the remaining pins. Pin 6 is...

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