/******************   Arduino SPI with DHT22 and UltraSonic ******************/
/****************** LiquidCrystal_I2C 4 x 20 **********************************/
#include "SPI.h"
// DHT lib
#include <Adafruit_Sensor.h>
#include <DHT.h>
// DHT22
#define DHTPIN 2    
#define DHTTYPE DHT22   
DHT dht(DHTPIN, DHTTYPE);
//Variables
//float hum;  //Stores humidity value
float temp; //Stores temperature value
float dis;
float converted = 0.00;
// Sonic Sensor
#define ECHO_PIN 4
#define TRIG_PIN 3
#define G 12
#define R 8
const int buttonPin = 13; 

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,20,4);
// https://maxpromer.github.io/LCD-Character-Creator/
byte smileFace[]  = {0x00,0x00,0x1B,0x1B,0x00,0x11,0x0E,0x00};
byte sadFace[]    = {0x00,0x00,0x1B,0x1B,0x00,0x00,0x0E,0x11};

void setup()
{
  // initialize the lcd
  lcd.init();               
  // Create face
  lcd.createChar(7, smileFace);
  lcd.createChar(6, sadFace);
  // Initialize device.
  dht.begin();
  // Sonic
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
    pinMode(G, OUTPUT);
      pinMode(R, OUTPUT);
       pinMode(buttonPin, INPUT_PULLUP);
  //printHeader();
}

void loop()
{if (digitalRead(buttonPin) == LOW) {
    //Read data and store it to variables hum and temp
  //hum = dht.readHumidity();
  temp= dht.readTemperature();
  if ((temp > 32.0) && (temp < 37.0))
  {
    digitalWrite(G, HIGH);
     digitalWrite(R, LOW);
    }
   else {
     digitalWrite(R, HIGH);
     digitalWrite(G, LOW);
   }

  printSensorData();
  printReactionFace();
  printHeader( );}

}

//Print headers
void printHeader( )
{
  lcd.backlight();
  lcd.setCursor(1,0);
  lcd.print("CELCIUS");
  lcd.setCursor(1,1);
 lcd.print("KELVIN");
 //lcd.setCursor(1,2);
 //lcd.print("HUMIDITY");
  lcd.setCursor(1,3);
  lcd.print("DISTANCE");  
}

void printReactionFace()
{
  lcd.setCursor(10,0);
  (temp < 40.0) 
    ? lcd.write(6) 
    : lcd.write(7);

  lcd.setCursor(10,1);
  (converted < 273.15)
    ? lcd.write(6)
    : lcd.write(7);

 // lcd.setCursor(10,2);
 // (hum < 20)
  //  ? lcd.write(6)
  //  : lcd.write(7);

  lcd.setCursor(10,3);
  (dis < 3.0)
  ? lcd.write(6)
  : lcd.write(7);
}
void printSensorData() 
{ //lcd.backlight();
  //lcd.setCursor(1,0);
  //lcd.print("CELCIUS");
  lcd.setCursor(12, 0);      
  lcd.print(temp);
  lcd.setCursor(20 - 3, 0); 
  lcd.print((char)223);
  lcd.println("C");
  // Kelvin
  // T(K) = T(°C) + 273.15          
  converted = temp + 273.15;
  lcd.setCursor(1,1);
 // lcd.print("KELVIN");
  //lcd.setCursor(1,2);
  lcd.setCursor(12, 1);  
  lcd.print(converted);
  lcd.setCursor(20 - 3, 1); 
  lcd.println("K");
  // Humidity
  //lcd.setCursor(12, 2);  
  //lcd.print(hum);
 // lcd.setCursor(20 - 3, 2); 
 // lcd.println("%");
  // Distance
  
  dis = readDistanceCM();
  lcd.setCursor(12, 3);  
  lcd.print(dis);
  lcd.setCursor(20 - 3, 3); 
  lcd.println("cm");
}

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}