Arduino Fading LED tutorial

FADE- 

This example demonstrates the use of analogWrite() function in fading a LED on and off.

AnalogWrite uses pulse width modulation(PWM), turning a digital pin on and off very fast with a different ratio between on and off.

DUTY CYCLE-

Duty cycle is defined as the percentage of time a digital signal is ON over a time period. This period is the inverse of the frequency of waveform.

If a digital signal spends half of the time as ON and the other half as OFF, then it has a duty cycle of 50% and that is the case of an ideal square wave system.

PWM AS IN AnalogWrite() function -

Arduino circuit for fading LED-

Components Required-

1. Arduino or Genuine board.

2. 220 Ohm resistor. 

3. LED bulb. 

4. Connection wires and Breadboard.

CODE-

/* Made by Nishant kr */

int led = 6;          

int brightness = 0;    

int fadeAmount = 5;    

void setup() {

  // declare pin 6 to be an output:

  pinMode(led, OUTPUT);

}

void loop() {

   analogWrite(led, brightness);

  brightness = brightness + fadeAmount;

if (brightness <= 0 || brightness >= 255)

{  fadeAmount = -fadeAmount; }

  delay(30);

}

Connections-

Working model-