Seven Segment Display With Arduino

 PROGRAMMING 4 DIGIT 7 SEGMENT LED 

DISPLAY

INTRODUCTION:

Today we see how 7 segments LED display work. It is somewhat like a digital clock and also that type of watch we all see at Railway Station.

COMPONENTS::

• Arduino UNO.
• 7 segment led display
• jumper wire.
• bread board.
• resistor.

7-segment display is an 8-shaped component which packages 7 LEDs.Each LED is called a segment -When energized,one segment  forms part of a numeral (both decimal and hexadecimal) to be displayed.An additional 8th LEDs is something used within the same package thus allowing the indication of a decimal point (DP) when two or more 7-segment displays are connected together to displays number greater than ten.

code:

 int a=6;  //for displaying segment "a"

 int b=5;  //for displaying segment "b"

 int c=10;  //for displaying segment "c"

 int d=9;  //for displaying segment "d"

 int e=8;  //for displaying segment "e"

 int f=7;  //for displaying segment "f"

 int g=4;  //for displaying segment "g"

void setup() {

  // put your setup code here, to run once:

pinMode(a,OUTPUT);

pinMode(b,OUTPUT);

pinMode(c,OUTPUT);

pinMode(d,OUTPUT);

pinMode(e,OUTPUT);

pinMode(f,OUTPUT);

pinMode(g,OUTPUT);

}

void loop() {

digitalWrite(a,HIGH);

digitalWrite(b,HIGH);

digitalWrite(c,HIGH);

digitalWrite(d,HIGH);

digitalWrite(e,HIGH);

digitalWrite(f,HIGH);

digitalWrite(g,HIGH);

//for one

digitalWrite(b,LOW);digitalWrite(c,LOW);

delay(1000);

digitalWrite(a,HIGH);

digitalWrite(b,HIGH);

digitalWrite(c,HIGH);

digitalWrite(d,HIGH);

digitalWrite(e,HIGH);

digitalWrite(f,HIGH);

digitalWrite(g,HIGH);

//for two

digitalWrite(a,LOW);digitalWrite(b,LOW);

digitalWrite(g,LOW);

digitalWrite(e,LOW);digitalWrite(d,LOW);

delay(1000);

digitalWrite(a,HIGH);

digitalWrite(b,HIGH);

digitalWrite(c,HIGH);

digitalWrite(d,HIGH);

digitalWrite(e,HIGH);

digitalWrite(f,HIGH);

digitalWrite(g,HIGH);

//for three

digitalWrite(a,LOW);digitalWrite(b,LOW);

digitalWrite(g,LOW);digitalWrite(c,LOW);

digitalWrite(d,LOW);

delay(1000);

digitalWrite(a,HIGH);

digitalWrite(b,HIGH);

digitalWrite(c,HIGH);

digitalWrite(d,HIGH);

digitalWrite(e,HIGH);

digitalWrite(f,HIGH);

digitalWrite(g,HIGH);

//for four

digitalWrite(f,LOW);digitalWrite(g,LOW);

digitalWrite(b,LOW);digitalWrite(c,LOW);

delay(1000);

digitalWrite(a,HIGH);

digitalWrite(b,HIGH);

digitalWrite(c,HIGH);

digitalWrite(d,HIGH);

digitalWrite(e,HIGH);

digitalWrite(f,HIGH);

digitalWrite(g,HIGH);

//for five

digitalWrite(a,LOW);digitalWrite(f,LOW);

digitalWrite(g,LOW);digitalWrite(c,LOW);

digitalWrite(d,LOW);

delay(1000);

digitalWrite(a,HIGH);

digitalWrite(b,HIGH);

digitalWrite(c,HIGH);

digitalWrite(d,HIGH);

digitalWrite(e,HIGH);

digitalWrite(f,HIGH);

digitalWrite(g,HIGH);

//for six

digitalWrite(a,LOW);digitalWrite(f,LOW);

digitalWrite(e,LOW);digitalWrite(d,LOW);

digitalWrite(c,LOW);digitalWrite(g,LOW);

delay(1000);

digitalWrite(a,HIGH);

digitalWrite(b,HIGH);

digitalWrite(c,HIGH);

digitalWrite(d,HIGH);

digitalWrite(e,HIGH);

digitalWrite(f,HIGH);

digitalWrite(g,HIGH);

//for seven

digitalWrite(a,LOW);digitalWrite(b,LOW);

digitalWrite(c,LOW);

delay(1000);

digitalWrite(a,HIGH);

digitalWrite(b,HIGH);

digitalWrite(c,HIGH);

digitalWrite(d,HIGH);

digitalWrite(e,HIGH);

digitalWrite(f,HIGH);

digitalWrite(g,HIGH);

//for eight

digitalWrite(a,LOW);digitalWrite(b,LOW);

digitalWrite(c,LOW);digitalWrite(d,LOW);

digitalWrite(e,LOW);digitalWrite(f,LOW);digitalWrite(g,LOW);

delay(1000);

digitalWrite(a,HIGH);

digitalWrite(b,HIGH);

digitalWrite(c,HIGH);

digitalWrite(d,HIGH);

digitalWrite(e,HIGH);

digitalWrite(f,HIGH);

digitalWrite(g,HIGH);

//for nine

digitalWrite(f,LOW);digitalWrite(a,LOW);

digitalWrite(b,LOW);digitalWrite(g,LOW);

digitalWrite(c,LOW);digitalWrite(d,LOW);

delay(1000);

digitalWrite(a,HIGH);

digitalWrite(b,HIGH);

digitalWrite(c,HIGH);

digitalWrite(d,HIGH);

digitalWrite(e,HIGH);

digitalWrite(f,HIGH);

digitalWrite(g,HIGH);

}

here, we can see how 7-segment display work I do my connection according to it.....for example, I connect LED pin a with digital pin 6 and similarly b with digital pin 5....in this way we connect all the 7-segment display LED with Arduino UNO. and we can see in our code whatever number we can we only "LOW" that pin for example to display 7 no. LED we low (a,b,c)pin. we give a delay for rest when the number shown after 1 sec next number will be shown .we can increase the delay's time.

 

CIRCUIT:

7