LED Dimmer using Atmega16

Before you dim a led, go through this PWM tutorial and the page 83 of Atmega16 datasheet

Code:

#include <avr/io.h>

#include <util/delay.h>

void init_pwm()

{

  TCCR0|=(1<<WGM00)|(1<<WGM01) //fast pwm

  |(1<<COM01)                  //Clear OC0 on compare match, set OC0 at BOTTOM

  |(1<<CS00);       //fcu/(No prescaling)

   //Set OC0 PIN as output. It is  PB3 on ATmega16

   DDRB|=(1<<PB3);

}

int main()

{

   uint8_t i=0;     // variable i is to control the brightness of led

   init_pwm();      //Initialize PWM Channel 0

   while(1)

   {

      // increasing brightness

      for(i=0;i<255;i++)

      {

         //Now Set The Brighness using PWM

        OCR0=i;

        //Now Wait For Some Time

         _delay_ms(10);

      }

      // decreasing brightness

      for(i=255;i>0;i--)

      {

         //Now Set The Brighness using PWM

         OCR0=i;

         //Now Wait For Some Time

         _delay_ms(10);

      }

   }

return (0);

}

If you connect a LED to PB3 you will notice the brightness of the led is increasing and decreasing gradually. there's my video: