/**
   Water level Indicator for Home
   created by RAKESH PATIL
   Released on 08.05.2024.
*/

#include <LiquidCrystal.h>

#define trigger 3 //pin for trigger
#define echo 2 //pin for Echo
#define motor 5 //LED for indication
#define buzzer 6 //buzzer for sound
#define buttonPin 4 //LED with buzzer
int high = 0; //high level sensor 
int low = 0;  // low level sensor
int waterIN = 0; //Water in sensor
int newvalue = 0; //to check change in state of alarm
/* Display */
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

float time = 0, distance = 0;
int buttonState = 0;
int temp = 0, water = 0, alarm=0;
unsigned int oldvalue = newvalue = 0xFFFF;

void setup()
{
  Serial.begin(9600); //serial begins
  lcd.begin(16, 2); //LCD display begins
  pinMode(trigger, OUTPUT); 
  pinMode(echo, INPUT);
  pinMode(motor, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(buttonPin, INPUT);
  digitalWrite(motor, LOW);
  digitalWrite(buzzer, LOW);
  digitalWrite(buttonPin, HIGH);
  pinMode(A0, INPUT); //pin configured to HIGH level
  pinMode(A1, INPUT); //pin configured to LOW level
  pinMode(A2, INPUT); //pin configured to Water IN
  lcd.print("  Water Level ");
  lcd.setCursor(0, 1);
  lcd.print("   Indicator  ");
  delay(2000);
  lcd.clear();
}

void loop()
{
  //Start sensing Water level 
  digitalWrite(trigger, LOW);
  delayMicroseconds(2);
  digitalWrite(trigger, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigger, LOW);
  delayMicroseconds(2);
  time = pulseIn(echo, HIGH);
  distance = time * 340 / 20000; //calculate distance
  water = map(distance, 0, 400, 999, 0); //map water level as per distance
  Serial.println("Distance= " + String(distance)); 
  Serial.println("Water level= "+String(water)+" Liters");
  lcd.clear();
  lcd.print("Water level "); //display water level on first ROW of display
  lcd.print(water);
  lcd.print("L");
  high = analogRead(A0); //sense high level
  low = analogRead(A1);  //sense low level
  waterIN = analogRead(A2); //sense Water In
  Serial.println("High= "+String(high));
  Serial.println("Low= "+String(low));
  Serial.println("WaterIN= "+String(waterIN));
  Serial.println("Alarm no "+ String(alarm));
  Serial.println("Button logic ="+String(buttonState));
  Serial.println(oldvalue);
  Serial.println(newvalue);
  delay(500);

  buttonState = digitalRead(buttonPin); // check if the pushbutton is pressed
  delay(50);

  if (waterIN > 500) //if Water is coming in tank
  {
    lcd.setCursor(0, 1);
    lcd.print("Water filling");
    alarm=1;
    if (high > 500 || distance < 30) //check high level when water is coming
    {
      lcd.clear();
      lcd.print("Water level ");
      lcd.print(water);
      lcd.print("L");
      lcd.setCursor(0, 1);
      lcd.print("Tank Overflow ^");
      alarm=2;
    }
  }
  else if (high > 500 || distance<30) //check high level in other case
  {
    lcd.setCursor(0, 1);
    lcd.print("Tank Overflow_");
    alarm=3;
  }
  else if (distance < 50 && high < 500) //if tank is filling toward high level
  {
    lcd.setCursor(0, 1);
    lcd.print("Tank FULL");
  }
  else if (distance > 300 && low > 500) //check is water level is LOW
  {
    lcd.setCursor(0, 1);
    lcd.print("Water level LOW");
    alarm = 4;
  }
  else if (distance > 300 || low < 500) //check if tank is empty
  {
    lcd.setCursor(0, 1);
    lcd.print("----NO WATER----");
    alarm = 5;
    
  }
  //delay(500);
  newvalue = alarm;
 if (alarm==1 && temp==0)
 {
  digitalWrite(buzzer, HIGH);
  digitalWrite(motor, HIGH);
  delay(200);
  digitalWrite(buzzer, LOW);
  digitalWrite(motor, LOW);
  delay(2000);
 }
 else if ((alarm==2 || alarm==3) && temp==0)
 {
  digitalWrite(buzzer, HIGH);
  digitalWrite(motor, HIGH);
  delay(500);
  digitalWrite(buzzer, LOW);
  digitalWrite(motor, LOW);
  delay(500);
 }
 else if (alarm==4 && temp==0)
 {
  digitalWrite(buzzer, HIGH);
  digitalWrite(motor, HIGH);
  delay(2000);
  digitalWrite(buzzer, LOW);
  digitalWrite(motor, LOW);
  delay(500);
 }
 else if (alarm==5 && temp==0)
 {
  digitalWrite(buzzer, HIGH);
  digitalWrite(motor, HIGH);
  delay(200);
  digitalWrite(buzzer, LOW);
  digitalWrite(motor, LOW);
  delay(200);
 }
 else
 {
  delay(500);
 }
 if (buttonState == LOW && temp==0 && alarm>0)// && lock==0) 
  {
    temp=1;
  }
   else if (newvalue != oldvalue || alarm==0)
  {
    temp=0;
    oldvalue = newvalue;

  }
  alarm=0;
  
}


/*
unsigned int oldvalue = newvalue = 0xFFFF;

newvalue = read_my_data();
if (newvalue != oldvalue) {
   update_my_data(newvalue);
   oldvalue = newvalue;
}*/