#include <Servo.h> 

    int led1 = 13;
    int led2 = 12;
    int led3 = 11;
    int led4 = 10;
    int relay = 8;    
    int flowSensor = A1;
    int minin = A2;
    int mincal;
    int maxin = A3;
    int maxcal;
    int set1 = A0;
    int set2 = A4;
    int set3 = A5;
    int set4 = A6;
    unsigned long minutes = (1*1UL);
    unsigned long calA ;
    unsigned long calB ;
    unsigned long calC ;
    unsigned long calD ;
    unsigned long stall ;
    unsigned long duration ;
    unsigned long hall = 0 ;
    Servo Servo1  ;

void setup() {
   
    Serial.begin(115200);
    pinMode(led1, OUTPUT);
    pinMode(led2, OUTPUT);
    pinMode(led3, OUTPUT);
    pinMode(led4, OUTPUT);
    pinMode(relay, OUTPUT);
    pinMode(flowSensor, INPUT);
    pinMode(set1, INPUT_PULLUP);
    pinMode(set2, INPUT_PULLUP);
    pinMode(set3, INPUT_PULLUP);
    pinMode(set4, INPUT_PULLUP);
    Servo1.attach(9);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, LOW);
    mincal = analogRead(minin);            // reads the value of the potentiometer (value between 0 and 1023)
    mincal = map(mincal, 0, 1023, 0, 90);
    maxcal = analogRead(maxin);            // reads the value of the potentiometer (value between 0 and 1023)
    maxcal = map(maxcal, 0, 1023, 90, 180);
    
    digitalWrite(relay, LOW);
    delay(250);
    digitalWrite(relay, HIGH);    
    delay(250);
    Servo1.write(mincal) ;
    delay(2500) ;
    Servo1.write(maxcal) ;
    delay(2500) ;
    Servo1.write(mincal) ;
    delay(250);
    digitalWrite(relay, LOW);
    }

void loop() {
    
    {
    int wait = digitalRead(A0);
    }

if (digitalRead(A0) == HIGH)
    {
    calA = (6000);
    digitalWrite(led4, HIGH);}
    else{
    calA = (36000);
    digitalWrite(led4, LOW);
    }

if (digitalRead(A4) == HIGH)
    {
    calB = (0);
    } 
    else{
    calB = (1);
    }

if (digitalRead(A5) == HIGH)
    {
    calC = (0);
    } 
    else{
    calC = (2);
    }

if (digitalRead(A6) == HIGH)
    {
    calD = (0);
    } 
    else{
    calD = (3);
    }    

stall = calA+calB+calC+calD ;

    Serial.println(minutes++);
    Serial.println(stall);
    {
    duration = pulseIn(flowSensor, HIGH, 500000);
    hall = 60000.0/duration*1000 ;



if (hall >1) 
    {
    digitalWrite(led1, HIGH);
    minutes++ ;
if (minutes > stall ) 
    {
    digitalWrite(led2, LOW);
    digitalWrite(led3, HIGH);   
    digitalWrite(relay, HIGH);
    delay(250);
    Servo1.write(maxcal);
    delay(250);
    digitalWrite(relay, LOW);
    digitalWrite(relay, LOW);
    }
    }
else 
    {
    digitalWrite(led1, LOW);
    digitalWrite(relay, LOW);
    minutes = 0;
    }
  }
}