1 Phase SPWM Inverter

//Single Phase SPWM Inverter (Nano/UNO)

#include <TimerOne.h>

int outA =9;
int outB =10;
int total_sample =200;
int f_sine =50;
int f_pwm =20000;
float sinus[200];
 float phi=3.14;
 int flag = 0;
 int sample=0;
int potinput = A1;
 int feedbackinput = A0;
 int potinputval;
 int feedbackinputval;
 int A;


void setup() {
 for (int sudut=0;sudut<total_sample;sudut++){
     float derajat= sudut*(180./total_sample)*phi/180;
     sinus[sudut]=sin(derajat);
 }
  float t_pwm=(1000./f_pwm)*1000;
  delay(1000);
  pinMode(potinput, INPUT);
   pinMode(feedbackinput, INPUT);
   A = 0;
 Timer1.initialize(t_pwm);
  Timer1.attachInterrupt(generate_sinus);
  }

void loop() {
   potinputval = analogRead(potinput);
   potinputval = map(potinputval, 1023, 0, 1000, 0);
   feedbackinputval = analogRead(feedbackinput);
   feedbackinputval = map(feedbackinputval, 1023, 0, 1000, 0);
   while (potinputval > feedbackinputval) {
     if (A == 995) {
       potinputval = analogRead(potinput);
       potinputval = map(potinputval, 1023, 0, 1000, 0);
       feedbackinputval = analogRead(feedbackinput);
       feedbackinputval = map(feedbackinputval, 1023, 0, 1000, 0);
     }
     else {
       A = A + 1;
             potinputval = analogRead(potinput);
       potinputval = map(potinputval, 1023, 0, 1000, 0);
       feedbackinputval = analogRead(feedbackinput);
       feedbackinputval = map(feedbackinputval, 1023, 0, 1000, 0);
     }
   }
   while (potinputval < feedbackinputval) {
     if (A == 0) {
       potinputval = analogRead(potinput);
       potinputval = map(potinputval, 1023, 0, 1000, 0);
       feedbackinputval = analogRead(feedbackinput);
       feedbackinputval = map(feedbackinputval, 1023, 0, 1000, 0);
     }
     else {
       A = A - 1;
            potinputval = analogRead(potinput);
       potinputval = map(potinputval, 1023, 0, 1000, 0);
       feedbackinputval = analogRead(feedbackinput);
       feedbackinputval = map(feedbackinputval, 1023, 0, 1000, 0);
     }
   }
 }

void generate_sinus(){
     if(sample>total_sample && flag==0){
         flag=1;
        sample=0;
     }
          if(sample>total_sample && flag==1){
        flag=0;
        sample=0;
      }
      sample++;
      if(flag==0){
          Timer1.pwm(outA,(sinus[sample]*A));
          Timer1.pwm(outB,0);
  }
      if(flag==1){
           Timer1.pwm(outB,(sinus[sample]*A));
          Timer1.pwm(outA,0);
      }
 }