How to display Seven Segment using AVR microcontroller

7-segment displays are made up of 8 LED segments. 7 of these LED segments are in the shape of a line, whereas 1 segment is circular.

The 7 line shaped LED segments are used for displaying numbers 0 to 9 and a few letters like A, c, d, e, F, H, L, O, P, U, etc. The circular segment is used for displaying decimal point.

Each of the 8 elements has a pin associated with it which can be driven HIGH or LOW according to type of display and the number or alphabet to be displayed.

Common anode and common cathode types are available in 7-segment display. Depending on which type is used, the control signal required to light up a segment in the display changes. Common anode requires a LOW signal whereas common cathode requires a HIGH signal to light up a segment.

For more information about 7-segment LED display and how to use it, refer the topic 7-segment LED Display in the sensors and modules section.