#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include <OneWire.h>
#include <DallasTemperature.h>

#define ONE_WIRE_BUS 6 // Data wire is plugged into pin 6 on the Arduino 

OneWire oneWire(ONE_WIRE_BUS); // Setup a oneWire instance to communicate with any OneWire devices
// (not just Maxim/Dallas temperature ICs)
DallasTemperature sensors(&oneWire);   // Pass our oneWire reference to Dallas Temperature.

// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);

int trigPin = 9; // Sensor Trip pin connected to Arduino pin 9
int echoPin = 7; // Sensor Echo pin connected to Arduino pin 7
float pingTime;  // time for ping to travel from the sensor to the target and return
float targetDistance;  // Distance to Target in Centimeters
float speedOfSound = 776.5; // Speed of sound in miles per hour

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Initialize the LCD
  lcd.init();
  // Turn on the backlight
  lcd.backlight();

  // Print a message to the LCD
  lcd.print("Distance:");

  sensors.begin();   // Start up the library
  pinMode(8, OUTPUT);  // pin 8, 10, 13 output pins
  pinMode(10, OUTPUT);
  pinMode(13, OUTPUT);
}

void loop() {
  digitalWrite(trigPin, LOW); // Set trigger pin low
  delayMicroseconds(2000); // Let signal settle
  digitalWrite(trigPin, HIGH); // Set trigPin high
  delayMicroseconds(15); // Delay in high state
  digitalWrite(trigPin, LOW); // ping has now been sent
  delayMicroseconds(10);  // Delay in high state

  pingTime = pulseIn(echoPin, HIGH);  // pingTime in microseconds
  pingTime = pingTime / 1000000; // convert pingTime to seconds by dividing by 1000000 (microseconds in a second)
  pingTime = pingTime / 3600;  // convert pingtime to hours by dividing by 3600 (seconds in an hour)
  targetDistance = speedOfSound * pingTime; // This will be in miles, since we declared the speed of sound as kilometers per hour; although we're going to convert it back to centimeters
  targetDistance = targetDistance / 2; // Remember ping travels to the target and back from the target, so you must divide by 2 for actual target distance.
  targetDistance = targetDistance * 160934.4; // Convert miles to centimeters by multiplying by 160934.4
  sensors.requestTemperatures(); // Send the command to get temperature readings

  lcd.setCursor(10, 0); // Set the cursor to the tenth column of the first row
  lcd.print("                "); // Print blanks to clear the row
  lcd.setCursor(10,  0);  // Set Cursor again to the tenth column of the first row
  lcd.print((int)(targetDistance + 0.5)); // Print measured distance
  lcd.print("cm ");  // Print your units
  lcd.setCursor(0, 1); // Set the cursor to the first column of the second row
  lcd.print("                "); // Print blanks to clear the row
  lcd.setCursor(0, 1);  // Set Cursor again to the first column of the second row

  if (targetDistance > 40) {
    lcd.print("LEV LOW  ");
    lcd.print(sensors.getTempCByIndex(0));
    lcd.print((char)223);
    lcd.print ("C");
  } else if (targetDistance <= 40 && targetDistance > 20) { // Corrected condition
    lcd.print("LEV MED  ");
    lcd.print(sensors.getTempCByIndex(0));
    lcd.print((char)223);
    lcd.print ("C");
  } else {
    lcd.print ("LEV HIGH ");
    lcd.print(sensors.getTempCByIndex(0));
    lcd.print((char)223);
    lcd.print ("C");
  }

  delay(2000);

  if (targetDistance > 40) {
    digitalWrite (13, HIGH);  // Green LED ON
  } else {
    digitalWrite(13, LOW);   // Green LED OFF
  }

  if  (targetDistance <= 40 && targetDistance > 20) {
    digitalWrite (8, HIGH);   // Yellow LED ON
  } else {
    digitalWrite(8, LOW);    // Yellow LED OFF
  }

  if (targetDistance <= 20) { // Corrected condition
    digitalWrite(10, HIGH);   // Red LED ON
    delay(2000);
    digitalWrite(10, LOW);   // Red LED OFF
  } else {
    digitalWrite(10,  LOW);   // Red LED OFF
  }
}