// Start By the Name Of Allaha
#include <Keypad.h>
const int ROW_NUM = 4;
const int COLUMN_NUM = 4;
#include <LiquidCrystal_I2C.h> // LiquidCrystal_I2C library
LiquidCrystal_I2C lcd(0x27, 16, 2);
 
char keys[ROW_NUM][COLUMN_NUM] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};
 
byte pin_rows[ROW_NUM] = { 11, 10, 9, 8 };
byte pin_column[COLUMN_NUM] = { 7, 6, 5, 4 };
Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM);
 
int sensorInterrupt = 0;
int sensorPin = 2;
int solenoidValve =12;
const int Pump =13;
float SetPoint = 40.0; String code = " ";
float calibrationFactor = 6.90;
volatile byte pulseCount = 0;
float flowRate = 0.0;
float flow_per_Minute = 0.0;
float filled_Liter = 0.0;
float total_Litres = 0.000, volume = 0.000; 
unsigned long oldTime;

void setup() {
  //Serial.begin(9600);
  total_Litres = 0.0;
  pinMode(Pump, OUTPUT);
  lcd.begin(20, 4);
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Set Volume:");
  pinMode(solenoidValve, OUTPUT);
  digitalWrite(solenoidValve, HIGH);
  pinMode(sensorPin, INPUT);
  digitalWrite(sensorPin, HIGH);
  attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
}
 
void loop() {
  char key = keypad.getKey();
    //lcd.clear();
  if (key) {
    code += key;
    lcd.setCursor(0, 1);
    lcd.print(code);
    delay(100);
  }
 if (key == '#') {
      total_Litres = 0.0;
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Set Volume:");
      code = "";
      }
  if (key == '*') {
    if (code.toInt() <= 150.00) {
      volume = code.toInt();
    } else {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Set Volume:");
    }
    code = "";
  }
 
  if (total_Litres < volume) {
    digitalWrite(Pump, HIGH);
 
    if ((millis() - oldTime) > 1000) {
      detachInterrupt(sensorInterrupt);
 
      flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor;
      oldTime = millis();
      flow_per_Minute = (flowRate);
      filled_Liter = (flowRate / 60);
      total_Litres += filled_Liter;
 
      /*Serial.print("Flow rate :");
      Serial.print(flow_per_Minute);
      Serial.print("L/M");
      Serial.print("\t");*/
      
      //lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Speed :");
      lcd.print(flow_per_Minute);
      lcd.print(" L/M");
      
      /*Serial.print("Output Liquid Quantity:");
      Serial.print(total_Litres);
      Serial.println("Lt");
      Serial.print("\t");*/
      
      lcd.setCursor(0, 1);
      lcd.print("Filled:");
      lcd.print(total_Litres);
      lcd.print(" Lt");
      if (total_Litres > 40) {
        SetSolinoidValve();
      }
      pulseCount = 0;
      attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
    }
  } else {
    digitalWrite(Pump, LOW);
    volume = 0;
  }
}
 
void pulseCounter() {
 
  pulseCount++;
}
 
void SetSolinoidValve() {
  digitalWrite(solenoidValve, LOW);
}