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circuit diagram

code

 // MakeIdea [Hemant]

#include <avr/io.h>

#include <avr/interrupt.h>

#include <math.h>

#define SinDivisions (200)

static int microMHz = 16;

static int freq = 50;   

static long int period;  

static unsigned int lookUp[SinDivisions];

static char theTCCR1A = 0b10000010; 

void setup()

{

  double temp; 

  

  period = microMHz*1e6/freq/SinDivisions;

  

  for(int i = 0; i < SinDivisions/2; i++)

  { 

    temp = sin(i*2*M_PI/SinDivisions)*period;

    lookUp[i] = (int)(temp+0.5);           

  }

  

  TCCR1A = theTCCR1A; 

       

  TCCR1B = 0b00011001;

       

  TIMSK1 = 0b00000001;

          

  ICR1   = period;   

  sei();             

  

  DDRB = 0b00000110; 

  pinMode(13, OUTPUT);

}

void loop(){;}

ISR(TIMER1_OVF_vect)

{

    static int num;

    static int delay1;

    static char trig;

    

    if(delay1 == 1)

    {

      theTCCR1A ^= 0b10100000;

      TCCR1A = theTCCR1A;

      delay1 = 0;             

    } 

    else if(num >= SinDivisions/2)

    {

      num = 0;                

      delay1++;

      trig ^=0b00000001;

      digitalWrite(13,trig);

    }

   

    OCR1A = OCR1B = lookUp[num];

    num++;

}