#include <IRremote.h>
#include <Wire.h>
#include <LiquidCrystal.h>

#define PIN_RECEIVER 2   // Signal Pin of IR receiver
#define NTC_PIN A0       // Analog pin for NTC temperature sensor
#define echoPin 5 // Echo Pin
#define trigPin 6 // Trigger Pin

IRrecv receiver(PIN_RECEIVER);

int maximumRange = 20; // Maximum range needed
int minimumRange = 15; // Minimum range needed
long duration, distance; // Duration used to calculate distance 
int dtime;

const float BETA = 3950;
float objectTemp, stemp; // object temperature
int readcount = 0;

LiquidCrystal lcd(12, 11, 10, 9, 8, 7); // Adjusted pins for LCD

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(9600);
  lcd.begin(16, 2); // Initialize LCD with 16 columns and 2 rows
  lcd.print("Initializing...");
  delay(2000);
  lcd.clear();
  receiver.enableIRIn(); // Start the IR receiver
}

void loop() {
  // Trigger the ultrasonic sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Read the echo
  duration = pulseIn(echoPin, HIGH);
  // Calculate the distance (in cm) based on the speed of sound.
  distance = duration * 0.034 / 2;
  
  // reading object temperature from NTC sensor
  objectTemp = readNTCTemperature();
  
  // print to Serial port
  Serial.println("Object: " + String(objectTemp) + "C");
  Serial.println(distance);

  // display on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  if (distance < minimumRange) {
    lcd.print("TOO CLOSE!");
  } else if (distance >= minimumRange && distance <= maximumRange) {
    lcd.print("Distance: ");
    lcd.print(distance);
    lcd.print("cm");
  } else {
    lcd.print("GET CLOSER       ");
  }
  lcd.setCursor(0, 1);
  lcd.print("Temp: ");
  lcd.print(objectTemp);
  lcd.print(" C");
 
  // until approx. 5 x 200 ms = 1 sec
  // if user is out of range, reset calculation
  if (distance < minimumRange || distance > maximumRange) {
    dtime = 100;
    readcount = 0;
    stemp = 0;
  }
  
  // IR receiver part
  if (receiver.decode()) {
    translateIR();
    receiver.resume();  // Receive the next value
  }
  
  delay(500);  // Adding a 0.5 second delay
  Serial.println("count: " + String(readcount));
}

float readNTCTemperature() {
  int analogValue = analogRead(NTC_PIN);
  float temperature = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  return temperature;
}

void translateIR()
{
  // Takes command based on IR code received
  switch (receiver.decodedIRData.command) {
    case 162:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("POWER");
      break;
    case 226:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("MENU");
      break;
    case 34:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("TEST");
      break;
    case 2:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("PLUS");
      break;
    case 194:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("BACK");
      break;
    case 224:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("PREV.");
      break;
    case 168:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("PLAY");
      break;
    case 144:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("NEXT");
      break;
    case 104:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Temp: 34 C");
      break;
    case 152:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("MINUS");
      break;
    case 176:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("key: C");
      break;
    case 48:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Temp: 34.5 C");
      break;
    case 24:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Temp: 35 C");
      break;
    case 122:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Temp: 35.5 C");
      break;
    case 16:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Temp: 36 C");
      break;
    case 56:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Temp: 36.5 C");
      break;
    case 90:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Temp: 37 C");
      break;
    case 66:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Temp: 37.5 C");
      break;
    case 74:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Temp: 38 C");
      break;
    case 82:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Temp: 38.5 C");
      break;
    default:
      lcd.clear();
      lcd.print(receiver.decodedIRData.command);
      lcd.print(" other button");
  }
}