7 Segment display
•7 segments imply there
are 7 LED segments as
shown in fig.
•A seven-segment
display is commonly
used in electronic
display device for
decimal numbers from
0 to 9 and in some
cases, basic characters.
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led display interface with 8051 micro controller, Study Guides, Projects, Research of Microprocessors
interface display with led using 8051 microcontroller. explains about all the things related to lcd
Typology: Study Guides, Projects, Research
2017/2018
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7 Segment display
7 segments imply there
are 7 LED segments as
shown in fig.
A seven-segment
display is commonly
used in electronic
display device for
decimal numbers from
0 to 9 and in some
cases, basic characters.
Types of 7 segment
There are two types of LED 7-segment display
called: Common Cathode (CC) and Common
Anode (CA).
The common cathode has all the cathodes of
the 7-segments connected directly together
and the common anode has all the anodes of
the 7-segments connected together and is
illuminated as follows.
The Common Anode (CA)
In the common anode
display, all the anode
connections of the LED
segments are joined
together to logic “1”.
The individual segments are
illuminated by applying a
ground, logic “0” or “LOW”
signal via a suitable current
limiting resistor to the
Cathode of the particular
segment (a-g).
Common anode
- Interfacing 7 segment to
Code
/ Code for 7 Segment Display Interfacing with 8051 Microcontroller
#include<reg51.h>
void msdelay(unsigned int time) // Function for creating delay in milliseconds.
unsigned i,j ;
for(i=0;i<time;i++)
for(j=0;j<1275;j++);
void main()
unsigned char no_code[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90}; //Array for hex
values (0-9) for common anode 7 segment
int k;
while(1)
for(k=0;k<10;k++)
P2=no_code[k];
msdelay(100);