//Global variables
    unsigned char a=0, b=0, c=0, SqCntr=0;
    static bool fsq1_strt;
    static bool fsq1_end;
    static bool fsq2_strt;
    static bool fsq2_end;
    static bool fsq3_strt;
    static bool fsq3_end;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32-S2!");
  SqCntr=1; 
  FlagRst();       //To start with, reset all flags    
}

void loop() {
  // put your main code here, to run repeatedly:
    Serial.println("Hello, This is main loop");
   // Serial.printf("value of a, b, c  are", a,b,c);
  if((SqCntr==1) && fsq1_end)
  {
    SqCntr=2;     //Next step
    fsq1_end=0;   //For the next iteration
    fsq2_end=0;   //Just to be sure
    Serial.println("Set Sequence to 2 in Sq1 loop");
  }
  if((SqCntr==2) && fsq2_end)
  {
    SqCntr=3;     //Next step
    fsq2_end=0;   //For the next iteration
    Serial.println("Set Sequence to 3 in Sq2 loop");
  }

  if((SqCntr==3) && fsq3_end)
  {
    SqCntr=4;     //Next step
    fsq3_end=0;   //For the next iteration
    Serial.println("Set Sequence to 4 in Sq3 loop");
  }


  if(SqCntr==4)   //All sequences over
  {
    SqCntr=1;     //Restart
    fsq3_end=0;   //For the next iteration
    FlagRst();    //For relooping
    Serial.println("Set Sequence to 1 and call reset");
  }

    Serial.println("Before while loop Step No is:");
    Serial.println(SqCntr);

    delay(2000);
 while(SqCntr<=3)           //Three loops
{
  Serial.println("After while loop Step No is:");
    Serial.println(SqCntr);
    delay(2000);

  if((SqCntr==1) && (!fsq1_end))
     {     Sq1Routine();   //Sequence routine
                          //No need of break here
                          //it will exit while loop
      break;
     }  
  if((SqCntr==2) && (!fsq2_end))
{  Serial.println("Sequence 2 routine entry");
          Sq2Routine();   //Sequence routine
      break;
}
  if((SqCntr==3) && (!fsq3_end))
  {
    Serial.println("Sequence 3 routine entry");
          Sq3Routine();   //Sequence routine
      break;
  }

}

}                   //Main loop ends

//Now each sequence routine
//Sequence1
 void Sq1Routine(void)
{
 if (!fsq1_end)         //Already ended? Then no work to do
 {              
 if (!fsq1_strt)         //Already started?
    {
        Serial.println("This is Sequence1 starting");
        fsq1_strt=1;        //Start of routine
        delay(2000);        //Show this
        a=0;                //Start counter
    }

      else   {
        a++;
        Serial.println("Inside Sq1 value of a is");
        Serial.println(a);
        delay(2000);
            if(a>=4)
            {
                fsq1_strt=0;        //Start of routine
                fsq1_end=1;         //Sequence end

            }

      }
 }
}
 //Sequence2
 void Sq2Routine(void)
{
 if (!fsq2_end)         //Already ended? Then no work to do
 {              
 if (!fsq2_strt)         //Already started?
    {
        Serial.println("This is Sequence2 starting");
        fsq2_strt=1;        //Start of routine
        delay(2000);        //Show this
        b=0;                //Start counter
    }

      else  {
        b++;
        Serial.println("Inside Sq2 value of b is");
        Serial.println(b);
        delay(2000);
            if(b>=4)
            {
                fsq2_strt=0;        //Start of routine
                fsq2_end=1;         //Sequence end

            }

      }
 }
}
 //Sequence1
 void Sq3Routine(void)
{
 if (!fsq3_end)         //Already ended? Then no work to do
 {              
 if (!fsq3_strt)         //Already started?
    {
        Serial.println("This is Sequence3 starting");
        fsq3_strt=1;        //Start of routine
        delay(2000);        //Show this
        c=0;                //Start counter
    }

      else  {
        c++;
        Serial.println("Inside Sq3 value of c is");
        Serial.println(c);
        delay(2000);
            if(c>=4)
            {
                fsq3_strt=0;        //Start of routine
                fsq3_end=1;         //Sequence end

            }

      }
 }
}

//Reset all flags
void FlagRst(void)
{

            //Start
    fsq1_end=0;
    fsq2_end=0;
    fsq3_end=0;

    fsq1_strt=0;
    fsq2_strt=0;
    fsq2_strt=0;
    fsq2_strt=0;


}