Arduino Tutorials – Lesson 3 – Three LED Blink Using Arduino UNO

Creating three LED blink program using Arduino UNO

Required Components

1. LED -3 no
2. Resistor 220Ω -3 no
3. Arduino UNO board -1 no
4. Bread Board -1 no
5. Connecting wires -1 set

Circuit

Steps

1. Make sure the components are working properly.
2. Connect Arduino board 5v and GND pin to the breadboard by using wires.
3. Connect 220 Ω Resistors to the each LED Anode (+) pin and both cathode (-) pin to GND through breadboard.
4. Connect Arduino 11, 12, 13 pin to the 220 Ω Resistors another end.
5. Check the Arduino program.
6. Check the circuit connections.
7. Run the Arduino program.

Arduino Program

int led1=11;
int led2=12;
int led3=13;

void setup (  )
{
  pinMode (led1, OUTPUT);
  pinMode (led2, OUTPUT;
  pinMode (led3, OUTPUT);
}


void loop (  )
{
  digitalWrite (led1, HIGH);
  digitalWrite (led2, LOW);
  digitalWrite (led3, LOW);
  delay (1000);
  
  digitalWrite (led3, LOW);
  digitalWrite (led1, LOW);
  digitalWrite (led2, HIGH);
  delay (1000);
  
  digitalWrite (led1, LOW);
  digitalWrite (led2, LOW);
  digitalWrite (led3, HIGH);
  delay (1000);
}

Usage

1. Focused lights.
2. Residential and business lighting.
3. Desk lamps.
4. Lighting for signage.