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As you may have noticed in the Arduino board (Uno, Mega-etc.) Are present some PIN that have next a symbol like a wave.

This symbol indicates that the output can also be used in "PWM" or "Pulse-width modulation".
Using this function, it is possible to vary, for example, the frequency of switching on and off of an LED.

Step 1: The Circuit

First we need to:

- Arduino Uno

- A resistor 220Ohm

- A LED

- Breadboard

- Wires for links

Mounted the circuit as described in the picture

Step 2: The Sketch

// Created by //

// Alessio Bigini 2015 //

// http://alessiobigini.it //

int lum = 0;

void setup()

{

pinMode(9, OUTPUT);

}

void loop()

{

for (lum = 0; lum < 255; lum++ )

{

analogWrite(9, lum);

delay(10);

}

for (lum = 255; lum > 0; lum-- )

{

analogWrite(9, lum);

delay(10);

}

}

Now load the sketch into your board

In this code I used two simple For loops that allow me to increase the variable "Lum" from 0 to 255 and then decrease it.

He published it, and I found it through his channel. I just wanted to thank you for making this instructable, and for sharing. I found this very informative.
<p>Thanks you so much!</p>
<p>I am considering building a collection of instructables on beginning Arduino.</p><p>Do I have your permission to include this instructable?</p>
Yes sure?
<p>It's added to my collection, I,ll let you know when I publish it.</p>

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