#include <LiquidCrystal_I2C.h>

#define I2C_ADD 0X27
#define LCD_COLS 16
#define LCD_ROWS 2
#define TRIG_PIN 26
#define ECHO_PIN 25
#define BAR_PINS 10
#define YELLOW 17 
#define GREEN 5
#define RED 18
LiquidCrystal_I2C lcd(I2C_ADD, LCD_COLS,LCD_ROWS);

long duration;
int distance;

int pins[] ={33,25,26,27,14,12,13,23,19,16};

void setup() {

  Serial.begin(115200);
  pinMode(TRIG_PIN,OUTPUT);
  pinMode(YELLOW, OUTPUT);
  pinMode(GREEN, OUTPUT);
  pinMode(RED, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  lcd.init();
  lcd.backlight();
  int i =0;
  while(i<BAR_PINS){
    pinMode(pins[i],OUTPUT);
    i++;
  }
  // digitalWrite(RED,HIGH);
  // delay(2000);
  // digitalWrite(YELLOW,LOW);
}

void loop() {

  digitalWrite(TRIG_PIN,LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN,HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN,LOW);
  duration = pulseIn(ECHO_PIN,HIGH);
  distance= duration*0.034/2;
  Serial.print("Distance: ");
  Serial.println(distance);
  int ledLevel = map(distance,0,4096,0,BAR_PINS);
  int thisLead=0;
  while(thisLead<BAR_PINS){
    if(thisLead<ledLevel){
      digitalWrite(pins[thisLead],HIGH);
    }else{
      digitalWrite(pins[thisLead],LOW);
    }
    thisLead++;
  }
  if(distance <= 150){
    highlevel();
  }else if(distance > 150 && distance<=350){
    midlevel();
  }else{
    lowlevel();
  }
  delay(1000);
}

void lowlevel(){
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Water is low    ");
  lcd.setCursor(0,1);
  lcd.print("Distance :" + String(distance));
  digitalWrite(YELLOW, HIGH);
  digitalWrite(GREEN, LOW);
  digitalWrite(RED, LOW);

}
void midlevel(){
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Water is medium");
  lcd.setCursor(0,1);
  lcd.print("Distance :" + String(distance));
  digitalWrite(YELLOW, LOW);
  digitalWrite(GREEN, HIGH);
  digitalWrite(RED, LOW);
}
void highlevel(){
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Water almost full");
  lcd.setCursor(0,1);
  lcd.print("Distance :" + String(distance));
  digitalWrite(YELLOW, LOW);
  digitalWrite(GREEN, LOW);
  digitalWrite(RED, HIGH);
}