Eight pins will suffice for a true seven-segment display whereas nine are required for one with a decimal point. Typically the displays have a common pin for all the LED anodes or cathodes. The standard segment identification is shown in Figure 1 and segments are named A to G starting at the top and going clockwise with G being the centre segment. A limited range of alphabetic characters can also be formed but these are of mixed case and can be difficult to read. The decimal, if supplied, point requires an eight LED.ħ-segment (or “seven-segment) LED displays are commonly used to display digital information. Each segment consists of one or more LEDs and can be lit independently of all the others to form the digits 0 to 9. Standard 7-segment display layout and segment identification.
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