Page 135 - ARM Based Microcontroller Projects Using MBED

7.16 PROJECT 13—7-SEGMENT LED DISPLAY 121

FIG. 7.65 Block diagram of the project.

FIG. 7.66 Some 7-Segment LEDs.

a
f
g b

c
e
d DP

FIG. 7.67 Segments of a 7-Segment LED.

7-segment displays (see Fig. 7.66) are used in microcontroller-based applications to display
numbers and some letters. A 7-segment display consists of 7 LEDs connected such that the
numbers 0–9 and some letters can be displayed by turning the appropriate LED segments
ON or OFF.
The segments of a 7-segment LED are identified by letters a–g (or A–G) s shown in Fig. 7.67.