LED Blink and Fade with Arduino

This example shows the simplest thing you can do with an Arduino to see physical output: it blinks and fades the LED.

Jan 26, 2022

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3 respects

lights

communication

Devices & Components

Arduino Uno Rev3

LED (generic)

Resistor 1k ohm

Software & Tools

Arduino IDE

Project description

Code

LED Blink

c_cpp

1int led = 13;
2
3//          
4void setup() {
5
6  pinMode(led,   OUTPUT);  //  LED_BULTIN OUTPUT  
7}
8
9// 
10void loop() {
11  digitalWrite(led,   HIGH);   // LED   (LED  HIGH)
12  delay(1000);                       // 1 
13   digitalWrite(led, LOW);    // LED  (LED  LOW)
14  delay(1000);                       //   1 
15}
16

int led = 13;

//          
void setup() {

  pinMode(led,   OUTPUT);  //  LED_BULTIN OUTPUT  
}

// 
void loop() {
  digitalWrite(led,   HIGH);   // LED   (LED  HIGH)
  delay(1000);                       // 1 
   digitalWrite(led, LOW);    // LED  (LED  LOW)
  delay(1000);                       //   1 
}

LED Fade

c_cpp

1int led = 13;           // PWM( )  13 led  
2int brightness = 0;    //   brightness 
3int fadeAmount = 5;    // fade  
4
5
6void setup() {
7  // declare pin 13 to be an output: 13 OUTPUT 
8  pinMode(led, OUTPUT);
9}
10
11//  
12void loop() {
13  //  led(13) 
14  analogWrite(led, brightness);
15
16  //  brightness fadeAmount   
17  brightness = brightness + fadeAmount;
18
19  //  brightness  0  255   fadeAmount  - 
20  if (brightness <= 0 || brightness >= 255)  {
21    fadeAmount = -fadeAmount;
22  }
23  //  30 milli    
24  delay(30);
25}
26

int led = 13;           // PWM( )  13 led  
int brightness = 0;    //   brightness 
int fadeAmount = 5;    // fade  


void setup() {
  // declare pin 13 to be an output: 13 OUTPUT 
  pinMode(led, OUTPUT);
}

//  
void loop() {
  //  led(13) 
  analogWrite(led, brightness);

  //  brightness fadeAmount   
  brightness = brightness + fadeAmount;

  //  brightness  0  255   fadeAmount  - 
  if (brightness <= 0 || brightness >= 255)  {
    fadeAmount = -fadeAmount;
  }
  //  30 milli    
  delay(30);
}

LED Fade

c_cpp

1int led = 13;           // PWM( )  13 led  
2int brightness = 0;    //
3   brightness 
4int fadeAmount = 5;    // fade  
5
6
7void setup() {
8
9  // declare pin 13 to be an output: 13 OUTPUT 
10  pinMode(led, OUTPUT);
11}
12
13//
14  
15void loop() {
16  //  led(13) 
17  analogWrite(led, brightness);
18
19  //
20  brightness fadeAmount   
21  brightness = brightness + fadeAmount;
22
23  //
24  brightness  0  255   fadeAmount  - 
25  if (brightness <= 0 || brightness >= 255)
26  {
27    fadeAmount = -fadeAmount;
28  }
29  //  30 milli    
30  delay(30);
31}
32

int led = 13;           // PWM( )  13 led  
int brightness = 0;    //
   brightness 
int fadeAmount = 5;    // fade  


void setup() {

  // declare pin 13 to be an output: 13 OUTPUT 
  pinMode(led, OUTPUT);
}

//
  
void loop() {
  //  led(13) 
  analogWrite(led, brightness);

  //
  brightness fadeAmount   
  brightness = brightness + fadeAmount;

  //
  brightness  0  255   fadeAmount  - 
  if (brightness <= 0 || brightness >= 255)
  {
    fadeAmount = -fadeAmount;
  }
  //  30 milli    
  delay(30);
}

LED Blink

c_cpp

1int led = 13;
2
3//          
4void setup() {
5
6  pinMode(led,  OUTPUT);  //  LED_BULTIN OUTPUT  
7}
8
9// 
10void loop() {
11  digitalWrite(led,  HIGH);   // LED   (LED  HIGH)
12  delay(1000);                       // 1 
13  digitalWrite(led, LOW);    // LED  (LED  LOW)
14  delay(1000);                       //  1 
15}
16

int led = 13;

//          
void setup() {

  pinMode(led,  OUTPUT);  //  LED_BULTIN OUTPUT  
}

// 
void loop() {
  digitalWrite(led,  HIGH);   // LED   (LED  HIGH)
  delay(1000);                       // 1 
  digitalWrite(led, LOW);    // LED  (LED  LOW)
  delay(1000);                       //  1 
}

Downloadable files

Schematic for the project

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