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Starter #10 Driving 7 Segment Digital Display with Arduino with Source Code

Here the steps how to wire and driving the 7 segment digital display using Arduino. Electronic Parts Required ARDUINO UNO/MEGA/PRO 4x Seven Segment Digital Display 8x 220 k Resistor

/*
    .  .          ........ .... ..   ......      ........                       
MMMM   MMMMM    MMMMMMMMMMMMMMMMMMM MMMMMMMMMM. MMMMMMMMM                       
 MMM.MMMMMMM   MMM      MMM     .MM.MMM     MMM .........      .... ... .  . .  
MMM MMMMMMM . .MM.      MM.     MMM MM.  . MMM MMMMMMMMM       MMMM MMMMM.MM MM
MMMMMMMMMMMM. .MMM      MMM.  .MMM.MMMMMMMMM  ........    MMM MM  . M .MMMMMMMM.
MMM    .MMM     MMMMMMMM.MMMMMMM.  MM    .MMM. MMMMMMMM.  MMM .MMMM MMMM MMMMMM.
www.14core.com                                             .   ...  . .  ......
*/

int a = 1;
int b = 2;
int c = 3;
int d = 4;
int e = 5;
int f = 6;
int g = 7;
int p = 8;

int d4 = 9;
int d3 = 10;
int d2 = 11;
int d1 = 12;

long n = 0;
int x = 100;
int del = 55;
 
void setup()
{
  pinMode(d1, OUTPUT);
  pinMode(d2, OUTPUT);
  pinMode(d3, OUTPUT);
  pinMode(d4, OUTPUT);
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
  pinMode(g, OUTPUT);
  pinMode(p, OUTPUT);
  pinMode(13,INPUT);
}
 
void loop()
{
  clearLEDs();
  pickDigit(1);
  pickNumber((n/x/1000)%10);
  delayMicroseconds(del);
 
  clearLEDs();
  pickDigit(2);
  pickNumber((n/x/100)%10);
  delayMicroseconds(del);
   
  clearLEDs();
  pickDigit(3);
  dispDec(3);
  pickNumber((n/x/10)%10);
  delayMicroseconds(del);
 
  clearLEDs();
  pickDigit(4);
  pickNumber(n/x%10);
  delayMicroseconds(del);
 
  n++;
/*
When you need to put the numbers to zero,
you may use this function

ClearDigital();

*/
 
 //ClearDigital();
 
}
 
void pickDigit(int x)
{
  digitalWrite(d1, HIGH);
  digitalWrite(d2, HIGH);
  digitalWrite(d3, HIGH);
  digitalWrite(d4, HIGH);
 
  switch(x)
  {
  case 1:
    digitalWrite(d1, LOW);
    break;
  case 2:
    digitalWrite(d2, LOW);
    break;
  case 3:
    digitalWrite(d3, LOW);
    break;
  default:
    digitalWrite(d4, LOW);
    break;
  }
}
 
void pickNumber(int x)
{
  switch(x)
  {
  default:
    zero();
    break;
  case 1:
    one();
    break;
  case 2:
    two();
    break;
  case 3:
    three();
    break;
  case 4:
    four();
    break;
  case 5:
    five();
    break;
  case 6:
    six();
    break;
  case 7:
    seven();
    break;
  case 8:
    eight();
    break;
  case 9:
    nine();
    break;
  }
}
 
void dispDec(int x)
{
  digitalWrite(p, LOW);
}
 
void clearLEDs()
{
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
  digitalWrite(p, LOW);
}
 
void zero()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, LOW);
}
 
void one()
{
  digitalWrite(a, LOW);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
}
 
void two()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, LOW);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, LOW);
  digitalWrite(g, HIGH);
}
 
void three()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, HIGH);
}
 
void four()
{
  digitalWrite(a, LOW);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}
 
void five()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, LOW);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, LOW);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}
 
void six()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, LOW);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}
 
void seven()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
}
 
void eight()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}
 
void nine()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, LOW);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}
/*
you can add a button, please refer to 14Core Starter #3 Button Control.
keep the Pin13 all high.
when push the button, it become LOW.
n=0;
*/
void ClearDigital()
{
if(digitalRead(13)== LOW)
{
n=0;
}  
}

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. . ........ .... .. ...... ........

MMMM MMMMM MMMMMMMMMMMMMMMMMMM MMMMMMMMMM. MMMMMMMMM

MMM.MMMMMMM MMM MMM .MM.MMM MMM ......... .... ... . . .

MMM MMMMMMM . .MM. MM. MMM MM. . MMM MMMMMMMMM MMMM MMMMM.MM MM

MMMMMMMMMMMM. .MMM MMM. .MMM.MMMMMMMMM ........ MMM MM . M .MMMMMMMM.

MMM .MMM MMMMMMMM.MMMMMMM. MM .MMM. MMMMMMMM. MMM .MMMM MMMM MMMMMM.

www.14core.com . ... . . ......

int a = 1;

int b = 2;

int c = 3;

int d = 4;

int e = 5;

int f = 6;

int g = 7;

int p = 8;

int d4 = 9;

int d3 = 10;

int d2 = 11;

int d1 = 12;

long n = 0;

int x = 100;

int del = 55;

void setup()

{

pinMode(d1, OUTPUT);

pinMode(d2, OUTPUT);

pinMode(d3, OUTPUT);

pinMode(d4, OUTPUT);

pinMode(a, OUTPUT);

pinMode(b, OUTPUT);

pinMode(c, OUTPUT);

pinMode(d, OUTPUT);

pinMode(e, OUTPUT);

pinMode(f, OUTPUT);

pinMode(g, OUTPUT);

pinMode(p, OUTPUT);

pinMode(13,INPUT);

}

void loop()

{

clearLEDs();

pickDigit(1);

pickNumber((n/x/1000)%10);

delayMicroseconds(del);

clearLEDs();

pickDigit(2);

pickNumber((n/x/100)%10);

delayMicroseconds(del);

clearLEDs();

pickDigit(3);

dispDec(3);

pickNumber((n/x/10)%10);

delayMicroseconds(del);

clearLEDs();

pickDigit(4);

pickNumber(n/x%10);

delayMicroseconds(del);

n++;

When you need to put the numbers to zero,

you may use this function

ClearDigital();

//ClearDigital();

}

void pickDigit(int x)

{

digitalWrite(d1, HIGH);

digitalWrite(d2, HIGH);

digitalWrite(d3, HIGH);

digitalWrite(d4, HIGH);

switch(x)

{

case 1:

digitalWrite(d1, LOW);

break;

case 2:

digitalWrite(d2, LOW);

break;

case 3:

digitalWrite(d3, LOW);

break;

default:

digitalWrite(d4, LOW);

break;

}

void pickNumber(int x)

{

switch(x)

{

default:

zero();

break;

case 1:

one();

break;

case 2:

two();

break;

case 3:

three();

break;

case 4:

four();

break;

case 5:

five();

break;

case 6:

six();

break;

case 7:

seven();

break;

case 8:

eight();

break;

case 9:

nine();

break;

}

void dispDec(int x)

{

digitalWrite(p, LOW);

}

void clearLEDs()

{

digitalWrite(a, LOW);

digitalWrite(b, LOW);

digitalWrite(c, LOW);

digitalWrite(d, LOW);

digitalWrite(e, LOW);

digitalWrite(f, LOW);

digitalWrite(g, LOW);

digitalWrite(p, LOW);

}

void zero()

{

digitalWrite(a, HIGH);

digitalWrite(b, HIGH);

digitalWrite(c, HIGH);

digitalWrite(d, HIGH);

digitalWrite(e, HIGH);

digitalWrite(f, HIGH);

digitalWrite(g, LOW);

}

void one()

{

digitalWrite(a, LOW);

digitalWrite(b, HIGH);

digitalWrite(c, HIGH);

digitalWrite(d, LOW);

digitalWrite(e, LOW);

digitalWrite(f, LOW);

digitalWrite(g, LOW);

}

void two()

{

digitalWrite(a, HIGH);

digitalWrite(b, HIGH);

digitalWrite(c, LOW);

digitalWrite(d, HIGH);

digitalWrite(e, HIGH);

digitalWrite(f, LOW);

digitalWrite(g, HIGH);

}

void three()

{

digitalWrite(a, HIGH);

digitalWrite(b, HIGH);

digitalWrite(c, HIGH);

digitalWrite(d, HIGH);

digitalWrite(e, LOW);

digitalWrite(f, LOW);

digitalWrite(g, HIGH);

}

void four()

{

digitalWrite(a, LOW);

digitalWrite(b, HIGH);

digitalWrite(c, HIGH);

digitalWrite(d, LOW);

digitalWrite(e, LOW);

digitalWrite(f, HIGH);

digitalWrite(g, HIGH);

}

void five()

{

digitalWrite(a, HIGH);

digitalWrite(b, LOW);

digitalWrite(c, HIGH);

digitalWrite(d, HIGH);

digitalWrite(e, LOW);

digitalWrite(f, HIGH);

digitalWrite(g, HIGH);

}

void six()

{

digitalWrite(a, HIGH);

digitalWrite(b, LOW);

digitalWrite(c, HIGH);

digitalWrite(d, HIGH);

digitalWrite(e, HIGH);

digitalWrite(f, HIGH);

digitalWrite(g, HIGH);

}

void seven()

{

digitalWrite(a, HIGH);

digitalWrite(b, HIGH);

digitalWrite(c, HIGH);

digitalWrite(d, LOW);

digitalWrite(e, LOW);

digitalWrite(f, LOW);

digitalWrite(g, LOW);

}

void eight()

{

digitalWrite(a, HIGH);

digitalWrite(b, HIGH);

digitalWrite(c, HIGH);

digitalWrite(d, HIGH);

digitalWrite(e, HIGH);

digitalWrite(f, HIGH);

digitalWrite(g, HIGH);

}

void nine()

{

digitalWrite(a, HIGH);

digitalWrite(b, HIGH);

digitalWrite(c, HIGH);

digitalWrite(d, HIGH);

digitalWrite(e, LOW);

digitalWrite(f, HIGH);

digitalWrite(g, HIGH);

}

you can add a button, please refer to 14Core Starter #3 Button Control.

keep the Pin13 all high.

when push the button, it become LOW.

n=0;

void ClearDigital()

{

if(digitalRead(13)== LOW)

{

n=0;

}

Download the source code here | 14Core Digital Display

Starter #9 Light Detection with (LDR) Light-Dependent Resistor with Arduino

Detecting a light or making a switch using Photoresistor interface with Arduino. Electronic Components Required Arduino UNO/MEGA/PRO 1x LED 1x 220k Ohm Resistor 1x 10k Resistor 1x LDR(Photo resistor)

/*
    .  .          ........ .... ..   ......      ........                       
MMMM   MMMMM    MMMMMMMMMMMMMMMMMMM MMMMMMMMMM. MMMMMMMMM                       
 MMM.MMMMMMM   MMM      MMM     .MM.MMM     MMM .........      .... ... .  . .  
MMM MMMMMMM . .MM.      MM.     MMM MM.  . MMM MMMMMMMMM       MMMM MMMMM.MM MM
MMMMMMMMMMMM. .MMM      MMM.  .MMM.MMMMMMMMM  ........    MMM MM  . M .MMMMMMMM.
MMM    .MMM     MMMMMMMM.MMMMMMM.  MM    .MMM. MMMMMMMM.  MMM .MMMM MMMM MMMMMM.
                                                           .   ...  . .  ......
*/

int photocellPin = 2;//define the LDR to D2;
int ledPin =12;
int val =0; //val to store the data;
void setup(){
pinMode(ledPin,OUTPUT);//set the ledPin to output;
Serial.begin(9600);
}
void loop(){
val = analogRead(photocellPin);
Serial.println("current light is");
Serial.println(val);
if (val<350){
//512 =2.5V, you can modify this to adjust the sensitivity;
digitalWrite(ledPin,HIGH);
}
else{
digitalWrite(ledPin,LOW);
}
delay(1000);
}

. . ........ .... .. ...... ........

MMMM MMMMM MMMMMMMMMMMMMMMMMMM MMMMMMMMMM. MMMMMMMMM

MMM.MMMMMMM MMM MMM .MM.MMM MMM ......... .... ... . . .

MMM MMMMMMM . .MM. MM. MMM MM. . MMM MMMMMMMMM MMMM MMMMM.MM MM

MMMMMMMMMMMM. .MMM MMM. .MMM.MMMMMMMMM ........ MMM MM . M .MMMMMMMM.

MMM .MMM MMMMMMMM.MMMMMMM. MM .MMM. MMMMMMMM. MMM .MMMM MMMM MMMMMM.

. ... . . ......

int photocellPin = 2;//define the LDR to D2;

int ledPin =12;

int val =0; //val to store the data;

void setup(){

pinMode(ledPin,OUTPUT);//set the ledPin to output;

Serial.begin(9600);

}

void loop(){

val = analogRead(photocellPin);

Serial.println("current light is");

Serial.println(val);

if (val<350){

//512 =2.5V, you can modify this to adjust the sensitivity;

digitalWrite(ledPin,HIGH);

}

else{

digitalWrite(ledPin,LOW);

}

delay(1000);

}

Download the source code here | 14Core Light Detection

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