#include<Servo.h>

const int buttonPin1 = 10;//Manual closing button
const int buttonPin2 = 11;//Manual opening button
const int buttonPin3 = 12;//Manual mode button
const int buttonPin4 = 13;//Automated mode button
const int irSensorPin = 2;

static const int servoPin=6;
Servo servo1;
byte flag=90;//for andle of movement
byte mode=1;//manual mode

// Variables to hold state
volatile unsigned long lastTime = 0;
volatile int count = 0;
unsigned long rpm = 0;


// Interrupt Service Routine to count pulses
void countPulse()
{
  count++;
}


void setup()
{
  pinMode(buttonPin1,INPUT_PULLUP);//from 0 to 90 degree
  pinMode(buttonPin2,INPUT_PULLUP);//from 90 to 0 degree
  pinMode(buttonPin3,INPUT_PULLUP);
  pinMode(buttonPin4,INPUT_PULLUP);
  servo1.write(90);
  servo1.attach(servoPin);

  // Initialize Serial communication
  Serial.begin(9600);
  pinMode(irSensorPin, INPUT);
  // Attach an interrupt to the IR sensor pin
  attachInterrupt(digitalPinToInterrupt(irSensorPin), countPulse, RISING);
}
void loop()
{
  // Calculate RPM every 1 second
  if (millis() - lastTime >= 1000) 
  {
    // Calculate RPM
    rpm = (count * 60)/ 4; // Assuming 4 slots or markings on the rotating object
    Serial.print("RPM: ");
    Serial.println(rpm); 
    // Reset count and update lastTime
    count = 0;
    lastTime = millis();
  }
  
//--------------- mode selection
  if(digitalRead(buttonPin3)==LOW)
  {
    mode=0;//Manual mode
  }

  else if(digitalRead(buttonPin4)==LOW)//FOR AUTOMATED MODE
  { 
    mode=1;//Automated mode

  }
//----------

//automated fn
if(mode==1){

    if(rpm!=0)//checking whether the bus start running
    {
      if(flag != 90)//checking whether already closed or not
      {
        for(int posDegrees=0;posDegrees<=90;posDegrees++)//closing the stair
        {
          servo1.write(posDegrees);
          delay(15); // this speeds up the simulation
        }
      }
      flag=90;
      // delay(3000);
    }

    else//checking the bus is not running
    {
      if(flag!=0)
      {
        for(int posDegrees=90;posDegrees>=0;posDegrees--)
        {
          servo1.write(posDegrees);
          delay(15); // this speeds up the simulation
        }
      }
      flag=0;
      // delay(3000);
    }
    

}
else if(mode==0){//manual fn

  if(digitalRead(buttonPin1)==LOW)//to close 
    {
      if(flag != 90)
      {
        for(int posDegrees=0;posDegrees<=90;posDegrees++)
        {
          servo1.write(posDegrees);
          delay(15); // this speeds up the simulation
        }
      }
      flag=90;
    }
  

 else if(digitalRead(buttonPin2)==LOW)
  {
   
      if(flag!=0)
      {
        for(int posDegrees=90;posDegrees>=0;posDegrees--)
        {
         servo1.write(posDegrees);
          delay(15); // this speeds up the simulation
        }
      }
      flag=0;
    }

    else if(rpm!=0){

        if(flag != 90)
      {
        for(int posDegrees=0;posDegrees<=90;posDegrees++)
        {
          servo1.write(posDegrees);
          delay(15); // this speeds up the simulation
        }
      }
      flag=90;

    }

}


}