Arduino Tutorials – Lesson 2 – Double LED blink using Arduino UNO

Creating Double LED blink program using Arduino UNO

Required Components

1. Led -2 no
2. Resistor 220Ω -2 no
3. Arduino 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 bread board by using wires.
3. Connect 220 Ω Resistors to the each LED Anode (+) pin and both cathode (-) pin to Gnd.
4. Connect Arduino 9, 10 pin to the each 220 Ω Resistors another end.
5. Check the Arduino program.
6. Check the circuit connections.
7. Run the Arduino program.

Arduino Program

int led1 = 9;
int led2 = 10;

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

void loop()
{
  digitalWrite (led1, LOW);
  digitalWrite (led2, HIGH);
  delay (500);
  
  digitalWrite (led1, HIGH);
  digitalWrite (led2, LOW);
  delay (500);
}

Usage

1. Reading lights.
2. Night lights.
3. Security lights.