Interfacing Array of LED’s with Arduino

 

Aim:

In this article, we are going to blink an LED using our arduino board. I will be using an Arduino Uno board to demonstrate the whole process. Before going deep, if you are very new to arduino, I suggest you read the following articles.

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 Array of LED's to Arduino
// Author: Hack Projects
// Module description: Operate single LED
// ***********************************************************
const int LED1 = 10; 
const int LED2 = 11;
const int LED3 = 12;
const int LED4 = 13;

void setup()
{
  pinMode(LED1,OUTPUT);
  pinMode(LED2,OUTPUT);
  pinMode(LED3,OUTPUT);
  pinMode(LED4,OUTPUT);
}

void loop()
{
  digitalWrite(LED1,HIGH);
  digitalWrite(LED2,HIGH);
  digitalWrite(LED3,HIGH);
  digitalWrite(LED4,HIGH);
  delay(1000);
  digitalWrite(LED1,LOW);
  digitalWrite(LED2,LOW);
  digitalWrite(LED3,LOW);
  digitalWrite(LED4,LOW);
  delay(1000);
}

Downloads:

The code was compiled in Keil uvision4 and simulation was made in Proteus v7.7.
To download code and proteus simulation click here.

Further Reading suggestions:

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