// Program to control 3-phase BLDC Motor

const int phase1pin = 1;
const int phase2pin = 2;
const int phase3pin = 3;
const int potPin = A2;
int rpm = 5000;
long int delayTime=(20000000)/rpm;
float duty=0.25;

void setup(){
  //Serial.begin(9600);
  pinMode(phase1pin, OUTPUT);
  pinMode(phase2pin, OUTPUT);
  pinMode(phase3pin, OUTPUT);
}

void loop(){
  rpm=600+4*analogRead(potPin);
  delayTime=(20000000)/rpm;
  //Serial.println(rpm);
  switchStep(1);
  switchStep(2);
  switchStep(3);
}

void switchStep(int stage){
  switch(stage){
    case 1:
      digitalWrite(phase1pin, HIGH);
      digitalWrite(phase2pin, LOW);
      digitalWrite(phase3pin, LOW);
      delayMicroseconds(delayTime*duty);
      digitalWrite(phase1pin, LOW);
      delayMicroseconds(delayTime*(1-duty));
      break;
    case 2:
      digitalWrite(phase1pin, LOW);
      digitalWrite(phase2pin, HIGH);
      digitalWrite(phase3pin, LOW);
      delayMicroseconds(delayTime*duty);
      digitalWrite(phase2pin, LOW);
      delayMicroseconds(delayTime*(1-duty));
      break;
    case 3:
      digitalWrite(phase1pin, LOW);
      digitalWrite(phase2pin, LOW);
      digitalWrite(phase3pin, HIGH);
      delayMicroseconds(delayTime*duty);
      digitalWrite(phase3pin, LOW);
      delayMicroseconds(delayTime*(1-duty));
      break;
  }
}