Interfacing 7-Segment

Interfacing 7-Segment with 8051 using keil

7-Segment is the best display to message something spatially numbers by using low electrical power.

If we need to display some numerical data in a message board then we can choose 7-segment display because the 7-segment is a one type of LED display, it consume minimum electrical power to display. On the other hand LCD or other messaging display takes a huge amount of power to display something.

There are two types of 7-segment displays in our hand.

Common Anode 7-segment display.

              And

Common Cathode 7-segment display.

How to use Common-Cathode 7-segment display

   

Pin description for common cathode 7-segment display

Pin No.                         Used for

1                                                                    e

2                                                                    d

3                                                                    GND

4                                                                    C

5                                                                    Dp

6                                                                    b

7                                                                    a

8                                                                    GND

9                                                                    f

10                                                                g                                                                                                                     

In common anode display if we want to display a LED we have to make output low (0) to that LED pin.

Suppose if we want to display ‘1’ in the common cathode display, then we have to make b and c to output high (1) and remaining pin to output low (0).

Like that..

For common cathode display

Dp       g          f           e          d          c          b          a          Hex code         Display

0          0          1          1          1          1          1          1          0x3F                 0

0          0          0          0          0          1          1          0          0x06                1

0          1          0          1          1          0          1          1          0x5B                2

0          1          0          0          1          1          1          1          0x4F                 3

0          1          1          0          0          1          1          0          0x66                4

0          1          1          0          1          1          0          1          0x6D                5

0          1          1          1          1          1          0          1          0x7D                6

0          0          0          0          0          1          1          1          0x07                7

0          1          1          1          1          1          1          1          0x7F                 8

0          1          1          0          1          1          1          1          0x6f                 9