Shift Register Tutorial

A guide how to control 7 segment display with Shift register as well as daisy chain them to create multi digit displays

Aug 3, 2020

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display

shift register

seven segments

Devices & Components

Arduino Nano

7 Segment LED Display, InfoVue

Shift Register- Parallel to Serial

Software & Tools

Arduino IDE

Project description

Code

Connect two 7 segment displays to show count from 0 to 99

arduino

Two shift registers are daisy chained . When one is overflown it pushes bits to teh other one

1int DS_pin = 4;
2int STCP_pin =3;
3int SHCP_pin = 2 ;
4
5int dec_digits  [10] {1,79,18,6,76,36,32,15,0,4};
6
7
8void setup() {
9
10  pinMode(DS_pin,  OUTPUT);
11  pinMode(STCP_pin, OUTPUT);
12  pinMode(SHCP_pin, OUTPUT);
13}
14
15
16void  loop() { 
17
18  
19for (int j=0;j<10;j++){  
20for (int i=0;i<10;i++){
21  digitalWrite(STCP_pin,LOW);
22  shiftOut(DS_pin, SHCP_pin, LSBFIRST,dec_digits[i]);
23  shiftOut(DS_pin, SHCP_pin, LSBFIRST,dec_digits[j]);
24  digitalWrite(STCP_pin,  HIGH);
25  delay(300);
26}
27}
28}

int DS_pin = 4;
int STCP_pin =3;
int SHCP_pin = 2 ;

int dec_digits  [10] {1,79,18,6,76,36,32,15,0,4};


void setup() {

  pinMode(DS_pin,  OUTPUT);
  pinMode(STCP_pin, OUTPUT);
  pinMode(SHCP_pin, OUTPUT);
}


void  loop() { 

  
for (int j=0;j<10;j++){  
for (int i=0;i<10;i++){
  digitalWrite(STCP_pin,LOW);
  shiftOut(DS_pin, SHCP_pin, LSBFIRST,dec_digits[i]);
  shiftOut(DS_pin, SHCP_pin, LSBFIRST,dec_digits[j]);
  digitalWrite(STCP_pin,  HIGH);
  delay(300);
}
}
}

Conreol 7 segment display with Arduino and Shift Register to display digit sequence 0-9

arduino

1int DS1_pin = 4;
2int STCP1_pin =3;
3int SHCP1_pin = 2 ;
4
5int   digits [10][8]{
6  {0,1,1,1,1,1,1,0}, // digit 0
7  {0,0,1,1,0,0,0,0}, // digit   1
8  {0,1,1,0,1,1,0,1}, // digit 2
9  {0,1,1,1,1,0,0,1}, // digit 3
10  {0,0,1,1,0,0,1,1},   // digit 4
11  {0,1,0,1,1,0,1,1}, // digit 5
12  {0,1,0,1,1,1,1,1}, // digit 6
13   {0,1,1,1,0,0,0,0}, // digit 7
14  {0,1,1,1,1,1,1,1}, // digit 8
15  {0,1,1,1,1,0,1,1}   // digit 9
16};
17
18
19void display_digit(int d){
20  if (digits[d][0]==1)   digitalWrite(7, LOW); else digitalWrite(7, HIGH); //A
21  if (digits[d][1]==1)   digitalWrite(8, LOW); else digitalWrite(8, HIGH); //B
22  if (digits[d][2]==1)   digitalWrite(9, LOW); else digitalWrite(9, HIGH); //C
23  if (digits[d][3]==1)   digitalWrite(2, LOW); else digitalWrite(2, HIGH); //D
24  if (digits[d][4]==1)   digitalWrite(3, LOW); else digitalWrite(3, HIGH); //E
25  if (digits[d][5]==1)   digitalWrite(5, LOW); else digitalWrite(5, HIGH); //F
26  if (digits[d][6]==1)   digitalWrite(4, LOW); else digitalWrite(4, HIGH); //G
27}
28
29void DisplayDigit(int   Digit)
30{
31    digitalWrite(STCP1_pin,LOW);
32    for (int i = 7; i>=0; i--)
33    {
34    digitalWrite(SHCP1_pin,LOW);
35    if (digits[Digit][i]==1) digitalWrite(DS1_pin,   LOW); 
36    if (digits[Digit][i]==0) digitalWrite(DS1_pin, HIGH);
37    digitalWrite(SHCP1_pin,HIGH);
38    }
39   digitalWrite(STCP1_pin, HIGH); 
40}
41
42
43void setup() {  
44   pinMode(DS1_pin, OUTPUT);
45  pinMode(STCP1_pin, OUTPUT);
46  pinMode(SHCP1_pin,   OUTPUT);
47}
48
49void loop() {
50for (int i=0;i<10;i++){  
51  DisplayDigit(i);   
52  delay(300);
53}
54}

int DS1_pin = 4;
int STCP1_pin =3;
int SHCP1_pin = 2 ;

int   digits [10][8]{
  {0,1,1,1,1,1,1,0}, // digit 0
  {0,0,1,1,0,0,0,0}, // digit   1
  {0,1,1,0,1,1,0,1}, // digit 2
  {0,1,1,1,1,0,0,1}, // digit 3
  {0,0,1,1,0,0,1,1},   // digit 4
  {0,1,0,1,1,0,1,1}, // digit 5
  {0,1,0,1,1,1,1,1}, // digit 6
   {0,1,1,1,0,0,0,0}, // digit 7
  {0,1,1,1,1,1,1,1}, // digit 8
  {0,1,1,1,1,0,1,1}   // digit 9
};


void display_digit(int d){
  if (digits[d][0]==1)   digitalWrite(7, LOW); else digitalWrite(7, HIGH); //A
  if (digits[d][1]==1)   digitalWrite(8, LOW); else digitalWrite(8, HIGH); //B
  if (digits[d][2]==1)   digitalWrite(9, LOW); else digitalWrite(9, HIGH); //C
  if (digits[d][3]==1)   digitalWrite(2, LOW); else digitalWrite(2, HIGH); //D
  if (digits[d][4]==1)   digitalWrite(3, LOW); else digitalWrite(3, HIGH); //E
  if (digits[d][5]==1)   digitalWrite(5, LOW); else digitalWrite(5, HIGH); //F
  if (digits[d][6]==1)   digitalWrite(4, LOW); else digitalWrite(4, HIGH); //G
}

void DisplayDigit(int   Digit)
{
    digitalWrite(STCP1_pin,LOW);
    for (int i = 7; i>=0; i--)
    {
    digitalWrite(SHCP1_pin,LOW);
    if (digits[Digit][i]==1) digitalWrite(DS1_pin,   LOW); 
    if (digits[Digit][i]==0) digitalWrite(DS1_pin, HIGH);
    digitalWrite(SHCP1_pin,HIGH);
    }
   digitalWrite(STCP1_pin, HIGH); 
}


void setup() {  
   pinMode(DS1_pin, OUTPUT);
  pinMode(STCP1_pin, OUTPUT);
  pinMode(SHCP1_pin,   OUTPUT);
}

void loop() {
for (int i=0;i<10;i++){  
  DisplayDigit(i);   
  delay(300);
}
}

Control 7 display with Arduino and Shift Register-display digit sequence 0-9 using SHIFTOUT function

arduino

1int DS_pin = 4;
2int STCP_pin =3;
3int SHCP_pin = 2 ;
4
5int dec_digits   [10] {1,79,18,6,76,36,32,15,0,4};
6
7void setup() {
8
9  pinMode(DS_pin,   OUTPUT);
10  pinMode(STCP_pin, OUTPUT);
11  pinMode(SHCP_pin, OUTPUT);
12}
13
14
15void   loop() { 
16 
17for (int i=0;i<10;i++){
18  digitalWrite(STCP_pin,LOW);
19  shiftOut(DS_pin,   SHCP_pin, LSBFIRST,dec_digits[i]);
20  digitalWrite(STCP_pin, HIGH);
21  delay(300);
22
23}
24}

int DS_pin = 4;
int STCP_pin =3;
int SHCP_pin = 2 ;

int dec_digits   [10] {1,79,18,6,76,36,32,15,0,4};

void setup() {

  pinMode(DS_pin,   OUTPUT);
  pinMode(STCP_pin, OUTPUT);
  pinMode(SHCP_pin, OUTPUT);
}


void   loop() { 
 
for (int i=0;i<10;i++){
  digitalWrite(STCP_pin,LOW);
  shiftOut(DS_pin,   SHCP_pin, LSBFIRST,dec_digits[i]);
  digitalWrite(STCP_pin, HIGH);
  delay(300);

}
}

Conreol 7 segment display with Arduino and Shift Register to display digit sequence 0-9

arduino

1int DS1_pin = 4;
2int STCP1_pin =3;
3int SHCP1_pin = 2 ;
4
5int  digits [10][8]{
6  {0,1,1,1,1,1,1,0}, // digit 0
7  {0,0,1,1,0,0,0,0}, // digit  1
8  {0,1,1,0,1,1,0,1}, // digit 2
9  {0,1,1,1,1,0,0,1}, // digit 3
10  {0,0,1,1,0,0,1,1},  // digit 4
11  {0,1,0,1,1,0,1,1}, // digit 5
12  {0,1,0,1,1,1,1,1}, // digit 6
13  {0,1,1,1,0,0,0,0}, // digit 7
14  {0,1,1,1,1,1,1,1}, // digit 8
15  {0,1,1,1,1,0,1,1}  // digit 9
16};
17
18
19void display_digit(int d){
20  if (digits[d][0]==1)  digitalWrite(7, LOW); else digitalWrite(7, HIGH); //A
21  if (digits[d][1]==1)  digitalWrite(8, LOW); else digitalWrite(8, HIGH); //B
22  if (digits[d][2]==1)  digitalWrite(9, LOW); else digitalWrite(9, HIGH); //C
23  if (digits[d][3]==1)  digitalWrite(2, LOW); else digitalWrite(2, HIGH); //D
24  if (digits[d][4]==1)  digitalWrite(3, LOW); else digitalWrite(3, HIGH); //E
25  if (digits[d][5]==1)  digitalWrite(5, LOW); else digitalWrite(5, HIGH); //F
26  if (digits[d][6]==1)  digitalWrite(4, LOW); else digitalWrite(4, HIGH); //G
27}
28
29void DisplayDigit(int  Digit)
30{
31    digitalWrite(STCP1_pin,LOW);
32    for (int i = 7; i>=0; i--)
33   {
34    digitalWrite(SHCP1_pin,LOW);
35    if (digits[Digit][i]==1) digitalWrite(DS1_pin,  LOW); 
36    if (digits[Digit][i]==0) digitalWrite(DS1_pin, HIGH);
37    digitalWrite(SHCP1_pin,HIGH);
38   }
39   digitalWrite(STCP1_pin, HIGH); 
40}
41
42
43void setup() {  
44  pinMode(DS1_pin, OUTPUT);
45  pinMode(STCP1_pin, OUTPUT);
46  pinMode(SHCP1_pin,  OUTPUT);
47}
48
49void loop() {
50for (int i=0;i<10;i++){  
51  DisplayDigit(i);  
52  delay(300);
53}
54}

int DS1_pin = 4;
int STCP1_pin =3;
int SHCP1_pin = 2 ;

int  digits [10][8]{
  {0,1,1,1,1,1,1,0}, // digit 0
  {0,0,1,1,0,0,0,0}, // digit  1
  {0,1,1,0,1,1,0,1}, // digit 2
  {0,1,1,1,1,0,0,1}, // digit 3
  {0,0,1,1,0,0,1,1},  // digit 4
  {0,1,0,1,1,0,1,1}, // digit 5
  {0,1,0,1,1,1,1,1}, // digit 6
  {0,1,1,1,0,0,0,0}, // digit 7
  {0,1,1,1,1,1,1,1}, // digit 8
  {0,1,1,1,1,0,1,1}  // digit 9
};


void display_digit(int d){
  if (digits[d][0]==1)  digitalWrite(7, LOW); else digitalWrite(7, HIGH); //A
  if (digits[d][1]==1)  digitalWrite(8, LOW); else digitalWrite(8, HIGH); //B
  if (digits[d][2]==1)  digitalWrite(9, LOW); else digitalWrite(9, HIGH); //C
  if (digits[d][3]==1)  digitalWrite(2, LOW); else digitalWrite(2, HIGH); //D
  if (digits[d][4]==1)  digitalWrite(3, LOW); else digitalWrite(3, HIGH); //E
  if (digits[d][5]==1)  digitalWrite(5, LOW); else digitalWrite(5, HIGH); //F
  if (digits[d][6]==1)  digitalWrite(4, LOW); else digitalWrite(4, HIGH); //G
}

void DisplayDigit(int  Digit)
{
    digitalWrite(STCP1_pin,LOW);
    for (int i = 7; i>=0; i--)
   {
    digitalWrite(SHCP1_pin,LOW);
    if (digits[Digit][i]==1) digitalWrite(DS1_pin,  LOW); 
    if (digits[Digit][i]==0) digitalWrite(DS1_pin, HIGH);
    digitalWrite(SHCP1_pin,HIGH);
   }
   digitalWrite(STCP1_pin, HIGH); 
}


void setup() {  
  pinMode(DS1_pin, OUTPUT);
  pinMode(STCP1_pin, OUTPUT);
  pinMode(SHCP1_pin,  OUTPUT);
}

void loop() {
for (int i=0;i<10;i++){  
  DisplayDigit(i);  
  delay(300);
}
}

Connect two 7 segment displays to show count from 0 to 99

arduino

Two shift registers are daisy chained . When one is overflown it pushes bits to teh other one

1int DS_pin = 4;
2int STCP_pin =3;
3int SHCP_pin = 2 ;
4
5int dec_digits
6  [10] {1,79,18,6,76,36,32,15,0,4};
7
8
9void setup() {
10
11  pinMode(DS_pin,
12  OUTPUT);
13  pinMode(STCP_pin, OUTPUT);
14  pinMode(SHCP_pin, OUTPUT);
15}
16
17
18void
19  loop() { 
20
21  
22for (int j=0;j<10;j++){  
23for (int i=0;i<10;i++){
24
25  digitalWrite(STCP_pin,LOW);
26  shiftOut(DS_pin, SHCP_pin, LSBFIRST,dec_digits[i]);
27
28  shiftOut(DS_pin, SHCP_pin, LSBFIRST,dec_digits[j]);
29  digitalWrite(STCP_pin,
30  HIGH);
31  delay(300);
32}
33}
34}

int DS_pin = 4;
int STCP_pin =3;
int SHCP_pin = 2 ;

int dec_digits
  [10] {1,79,18,6,76,36,32,15,0,4};


void setup() {

  pinMode(DS_pin,
  OUTPUT);
  pinMode(STCP_pin, OUTPUT);
  pinMode(SHCP_pin, OUTPUT);
}


void
  loop() { 

  
for (int j=0;j<10;j++){  
for (int i=0;i<10;i++){

  digitalWrite(STCP_pin,LOW);
  shiftOut(DS_pin, SHCP_pin, LSBFIRST,dec_digits[i]);

  shiftOut(DS_pin, SHCP_pin, LSBFIRST,dec_digits[j]);
  digitalWrite(STCP_pin,
  HIGH);
  delay(300);
}
}
}

Control 7 display with Arduino and Shift Register-display digit sequence 0-9 using SHIFTOUT function

arduino

1int DS_pin = 4;
2int STCP_pin =3;
3int SHCP_pin = 2 ;
4
5int dec_digits  [10] {1,79,18,6,76,36,32,15,0,4};
6
7void setup() {
8
9  pinMode(DS_pin,  OUTPUT);
10  pinMode(STCP_pin, OUTPUT);
11  pinMode(SHCP_pin, OUTPUT);
12}
13
14
15void  loop() { 
16 
17for (int i=0;i<10;i++){
18  digitalWrite(STCP_pin,LOW);
19  shiftOut(DS_pin,  SHCP_pin, LSBFIRST,dec_digits[i]);
20  digitalWrite(STCP_pin, HIGH);
21  delay(300);
22
23}
24}

int DS_pin = 4;
int STCP_pin =3;
int SHCP_pin = 2 ;

int dec_digits  [10] {1,79,18,6,76,36,32,15,0,4};

void setup() {

  pinMode(DS_pin,  OUTPUT);
  pinMode(STCP_pin, OUTPUT);
  pinMode(SHCP_pin, OUTPUT);
}


void  loop() { 
 
for (int i=0;i<10;i++){
  digitalWrite(STCP_pin,LOW);
  shiftOut(DS_pin,  SHCP_pin, LSBFIRST,dec_digits[i]);
  digitalWrite(STCP_pin, HIGH);
  delay(300);

}
}

Downloadable files

7 segment display connected to shift registor and arduino

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