Interfacing LED with Arduino

Aim:

Light Emitting Diodes (LED) is the most commonly used components, usually for displaying pins digital states. Typical uses of LEDs include alarm devices, timers and confirmation of user input such as a mouse click or keystroke. The main aim of this project is how to interface a single LED to arduino.

Description:

Interfacing LED:

Fig. 1 shows how to interface the LED to microcontroller. As you can see the Cathode is connected through a resistor to GND & the Anoode is connected to the Microcontroller pin. So when the Port Pin is HIGH the LED is ON & when the Port Pin is LOW the LED is turned OFF.

Interfacing LED with Arduino

We now want to flash a LED in arduino board. It works by turning ON a LED & then turning it OFF & then looping back to START. However the operating speed of microcontroller is very high so the flashing frequency will also be very fast to be detected by human eye.

Block Diagram

Schematic:

Code:

// ***********************************************************
// Project: Interfacing Single LED to Arduino
// Author: Hack Projects
// Module description: Operate single LED
// ***********************************************************
const int LED = 13; 
void setup()
{
  pinMode(LED,OUTPUT);
}
void loop()
{
  digitalWrite(LED,HIGH);
  delay(1000);
  digitalWrite(LED,LOW);
  delay(1000);
}

Downloads:

The code was compiled in Atmel Studio 6 and simulation was made in Proteus v7.7.
To download code and proteus simulation click here.

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