Arduino Seven Segment Display Interface

Today, we will see how we can use a common cathode seven segment display with an Arduino UNO.

The Circuit - 

The Code - 

int top = 8;

int mid = 6;

int bot = 4;

int dot = 2;

int top_left = 7;

int bot_left = 5;

int top_right = 9;

int bot_right = 3;

void setup(){

  pinMode(top, OUTPUT);

  pinMode(mid, OUTPUT);

  pinMode(bot, OUTPUT);

  pinMode(dot, OUTPUT);

  pinMode(top_left, OUTPUT);

  pinMode(bot_left, OUTPUT);

  pinMode(top_right, OUTPUT);

  pinMode(bot_right, OUTPUT);

}

void loop(){

  zero();

  delay(1000);

  blank();

  delay(1000);

  

  one();

  delay(1000);

  blank();

  delay(1000);

  

  two();

  delay(1000);

  blank();

  delay(1000);

  

  three();

  delay(1000);

  blank();

  delay(1000);

  

  four();

  delay(1000);

  blank();

  delay(1000);

  

  five();

  delay(1000);

  blank();

  delay(1000);

  six();

  delay(1000);

  blank();

  delay(1000);

  seven();

  delay(1000);

  blank();

  delay(1000);

  eight();

  delay(1000);

  blank();

  delay(1000);

  nine();

  delay(1000);

  blank();

  delay(1000);

}

void blank(){

  digitalWrite(top, LOW);

  digitalWrite(mid, LOW);

  digitalWrite(bot, LOW);

  digitalWrite(dot, LOW);

  digitalWrite(top_left, LOW);

  digitalWrite(bot_left, LOW);

  digitalWrite(top_right, LOW);

  digitalWrite(bot_right, LOW);

}

void zero(){

  digitalWrite(top, HIGH);

  digitalWrite(bot, HIGH);

  digitalWrite(dot, HIGH);

  digitalWrite(top_left, HIGH);

  digitalWrite(bot_left, HIGH);

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_right, HIGH);

}

void one(){

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_right, HIGH);

  digitalWrite(dot, HIGH);

}

void two(){

  digitalWrite(top, HIGH);

  digitalWrite(mid, HIGH);

  digitalWrite(bot, HIGH);

  digitalWrite(dot, HIGH);

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_left, HIGH);

}

void three(){

  digitalWrite(top, HIGH);

  digitalWrite(mid, HIGH);

  digitalWrite(bot, HIGH);

  digitalWrite(dot, HIGH);

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_right, HIGH);

}

void four(){

  digitalWrite(top_left, HIGH);

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_right, HIGH);

  digitalWrite(mid, HIGH);

  digitalWrite(dot, HIGH);

}

void five(){

  digitalWrite(top, HIGH);

  digitalWrite(mid, HIGH);

  digitalWrite(bot, HIGH);

  digitalWrite(dot, HIGH);

  digitalWrite(top_left, HIGH);

  digitalWrite(bot_right, HIGH);

}

void six(){

  digitalWrite(dot, HIGH);

  digitalWrite(top, HIGH);

  digitalWrite(mid, HIGH);

  digitalWrite(bot, HIGH);

  digitalWrite(top_left, HIGH);

  digitalWrite(bot_left, HIGH);

  digitalWrite(bot_right, HIGH);

}

void seven(){

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_right, HIGH);

  digitalWrite(top, HIGH);

  digitalWrite(dot, HIGH);

}

void eight(){

  digitalWrite(top, HIGH);

  digitalWrite(mid, HIGH);

  digitalWrite(bot, HIGH);

  digitalWrite(dot, HIGH);

  digitalWrite(top_left, HIGH);

  digitalWrite(bot_left, HIGH);

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_right, HIGH);

}

void nine(){

  digitalWrite(top, HIGH);

  digitalWrite(mid, HIGH);

  digitalWrite(bot, HIGH);

  digitalWrite(dot, HIGH);

  digitalWrite(top_left, HIGH);

  digitalWrite(top_right, HIGH);

  digitalWrite(bot_right, HIGH);

}

The Video - 

Arduino 16 X 2 Character LCD Display Interface

Today, we will see how we can use a 16X2 character LCD display with Arduino. Here is a link to the site if you want to buy one -

Character LCD Display - Amazon.in

The Circuit - 

The Program - 

#include <LiquidCrystal.h>

// initialize the library by associating any needed LCD interface pin

// with the arduino pin number it is connected to

const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;

LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

void setup() {

  // set up the LCD's number of columns and rows:

  lcd.begin(16, 2);

  // Print a message to the LCD.

  lcd.print("hello world!");

}

void loop() {

}

Here Is A Video - 

Using A Servo Motor Using Arduino

Today we will see, how we can use a Servo Motor with Arduino UNO. We will be using a TowerPro 9g Servo Motor. Here is a link if you want to buy one -

Tower Pro 9g Servo Motor - Amazon.in

The Circuit - 

The Program - 

#include <Servo.h>

Servo myservo;  // create servo object to control a servo

// twelve servo objects can be created on most boards

int pos = 0;    // variable to store the servo position

void setup() {

  myservo.attach(6);  // attaches the servo on pin 9 to the servo object

}

void loop() {

  for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees

    // in steps of 1 degree

    myservo.write(pos);              // tell servo to go to position in variable 'pos'

    delay(15);                       // waits 15ms for the servo to reach the position

  }

  for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees

    myservo.write(pos);              // tell servo to go to position in variable 'pos'

    delay(15);                       // waits 15ms for the servo to reach the position

  }

}

Here Is A Video -