Blinking LEDs

In this tutorial I am going to show you, how to blink LEDs using AVR micro controller. I am using ATmega128/ ATmega64 (both of the micro controller can be used interchangeably as they differ in the size of flash memory only). The 8 LEDs which I am going to blink/toggle are connected to PORTC of the micro  controller and they will toggle after 100 ms. So let's start with it............

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Blinking LEDs

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//Include AVR Header file

 #include"avr/io.h"
 

//Include DELAY Header file
#include"util/delay.h" 

//Start main function
void main()
{   

     //Set a particular port as input or output
     DDRC = 0xFF;            //PORTC output
 

     //infinite loop
     while(1)              
     {

          //set all the pins of PORTC to 1  
         PORTC = 0xFF;      
 

          //apply 100 ms delay
         _delay_ms(100);        

         //set all the pins of PORTC to 0  
         PORTC = 0x00;            

         //apply 100 ms delay
         _delay_ms(100);      
     }
}

Posted in: AVR, io, Tutorials