Fading a LED using Arduino UNO

FADING A LED USING ARDUINO UNO

INTRODUCTION

Arduino is a micro-controller which can be programmed to do certain operations like lighting led, controlling servo, etc. We’ll use Arduino UNO or any other clone for performing this Fading experiment. Fading a led in simple definition means turning the led ON and slowly turning it OFF within a finite (large) time interval. The time interval must be more than one second in order to experience the Fading of led.

MATERIALS REQUIRED

• Arduino UNO or any other clone and USB cable

• 5mm LED

• 20 K ohm resistor

• Breadboard

• Jumpers

PROCEDURE

• Connect any analog pin (usually marked by ‘~’ in front of the pin number) of Arduino to longer leg of led via a resistor.

• Now connect the shorter leg of led to ground pin on Arduino.

• The circuit is complete, upload the code and you can verify the output.

• The USB cable serves both as a medium to upload code as well as 5V power source.

CODE

The code for Fading led is available in basics library in Arduino IDE.

You can select the analog pin (~3, ~5, ~6, ~9, ~10 or ~11) you want to use. Also you can vary the delay time which will change your fade output.