Working with LED

A step by step procedure to work with LED using Arduino.

Apr 6, 2019

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starter

basic

led

Devices & Components

Arduino Uno Rev3

Perma-Proto Breadboard Half Size

5 mm LED: Red

Male/Male Jumper Wires

Resistor 1k ohm

Software & Tools

Arduino IDE

Project description

Code

Blinking of LED

arduino

1const int LED = 3;
2
3void setup() {
4    pinMode (LED, OUTPUT);
5}
6
7void  loop() {
8    digitalWrite (LED, HIGH);
9    delay (1000);
10    digitalWrite  (LED, LOW);
11    delay (1000);
12}

const int LED = 3;

void setup() {
    pinMode (LED, OUTPUT);
}

void  loop() {
    digitalWrite (LED, HIGH);
    delay (1000);
    digitalWrite  (LED, LOW);
    delay (1000);
}

LED ON for 2s and OFF for 3s

arduino

1const int LED = 3;
2
3void setup() {
4    pinMode (LED, OUTPUT);
5}
6
7void  loop() {
8    digitalWrite (LED, HIGH);
9    delay (2000);
10    digitalWrite  (LED, LOW);
11    delay (3000);
12}

const int LED = 3;

void setup() {
    pinMode (LED, OUTPUT);
}

void  loop() {
    digitalWrite (LED, HIGH);
    delay (2000);
    digitalWrite  (LED, LOW);
    delay (3000);
}

Fading Effects of LED

arduino

1const int LED_ao = 3;
2
3void setup() {
4    pinMode (LED_ao, OUTPUT);
5}
6
7void  loop() {
8    for (int brightness=1; brightness<=255; brightness++)
9    {
10      analogWrite (LED_ao, brightness);
11      delay (10);
12    }
13    for  (int brightness=255; brightness>0; brightness--)
14    {
15      analogWrite (LED_ao,  brightness);
16      delay (10);
17    }
18}

const int LED_ao = 3;

void setup() {
    pinMode (LED_ao, OUTPUT);
}

void  loop() {
    for (int brightness=1; brightness<=255; brightness++)
    {
      analogWrite (LED_ao, brightness);
      delay (10);
    }
    for  (int brightness=255; brightness>0; brightness--)
    {
      analogWrite (LED_ao,  brightness);
      delay (10);
    }
}

LED forever ON

arduino

1const int LED = 3;
2
3void setup() {
4    pinMode (LED, OUTPUT);
5}
6
7void  loop() {
8    digitalWrite (LED, HIGH);
9    
10}

const int LED = 3;

void setup() {
    pinMode (LED, OUTPUT);
}

void  loop() {
    digitalWrite (LED, HIGH);
    
}

Fade IN and Fade OUT at different speeds

arduino

1const int LED_ao = 3;
2
3void setup() {
4    pinMode (LED_ao, OUTPUT);
5}
6
7void  loop() {
8    for (int brightness=1; brightness<=255; brightness++)
9    {
10      analogWrite (LED_ao, brightness);
11      delay (25);
12    }
13    for  (int brightness=255; brightness>0; brightness--)
14    {
15      analogWrite (LED_ao,  brightness);
16      delay (5);
17    }
18}

const int LED_ao = 3;

void setup() {
    pinMode (LED_ao, OUTPUT);
}

void  loop() {
    for (int brightness=1; brightness<=255; brightness++)
    {
      analogWrite (LED_ao, brightness);
      delay (25);
    }
    for  (int brightness=255; brightness>0; brightness--)
    {
      analogWrite (LED_ao,  brightness);
      delay (5);
    }
}

Downloadable files

Circuit Diagram

Created using Visio Professional

Circuit Diagram

Breadboard Diagram

Make connections as shown in the figure.

Breadboard Diagram

Schematic Diagram

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