// Niña Gabriel Villaruel

// dht22 sensor
#include "DHT.h"
#define DHTPIN 4    // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
DHT dht(DHTPIN, DHTTYPE);

// servo motor 
#include <Servo.h>
Servo myservo;  // create servo object to control a servo

// analog temperature sensors 
const float BETA = 3950; // should match the Beta Coefficient of the thermistor
int temp1 = A1;
int temp2 = A2;
int temp3 = A3;

// 20x4 lcd 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4); 


void setup() {
  Serial.begin(9600);

  // analog temperature sensor
  pinMode(temp1,INPUT);
  pinMode(temp2,INPUT);
  pinMode(temp3, INPUT);

  // dht22 sensor
  dht.begin(); //initialize

  // servo motor
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object

  // 20x4 lcd
  lcd.init();  // initialize the lcd
  lcd.backlight();
}

void loop() {
  delay(1000);
  lcd.clear();

// RH reading
  float h = dht.readHumidity();

// temperature reading
  int analogValue1 = analogRead(temp1);
  int analogValue2 = analogRead(temp2);
  int analogValue3 = analogRead(temp3);

  // temperature conversion
  float celsius1 = 1 / (log(1 / (1023. / analogValue1 - 1)) / BETA + 1.0 / 298.15) - 273.15;
  float celsius2 = 1 / (log(1 / (1023. / analogValue2 - 1)) / BETA + 1.0 / 298.15) - 273.15;
  float celsius3 = 1 / (log(1 / (1023. / analogValue3 - 1)) / BETA + 1.0 / 298.15) - 273.15;

  // averaging temperature
  float avet = (celsius1 + celsius2 + celsius3) / 3.0;

  // show lcd values
  lcd.setCursor (12,2);
  lcd.print("RH");
  lcd.setCursor (12,3);
  lcd.print(h);
  lcd.print(" %");

  lcd.setCursor(0,0);
  lcd.print("T1 ");
  lcd.print(celsius1);
  lcd.print(" C");

  lcd.setCursor (0,1);
  lcd.print("T2 ");
  lcd.print(celsius2);
  lcd.print(" C");

  lcd.setCursor (0,2);
  lcd.print("T3 ");
  lcd.print(celsius3);
  lcd.print(" C");

  lcd.setCursor (12,0);
  lcd.print("Tave");
  lcd.setCursor (12,1);
  lcd.print(avet);
  lcd.print(" C");

  // show warning and servo movement in conditions

  // conditions

  if(h>=70 && h<=90 && avet>=22 && avet<=28) //condition 1
  {
    myservo.write(0);
    lcd.setCursor(0,3);
    lcd.print("OPTIMAL");
  }
    else if(h>90 && avet>=22 && avet<=28) // condition 2
  {
    myservo.write(180);
    lcd.setCursor(0,3);
    lcd.print("RH HIGH!");
  }
    else if(h<70 && avet>=22 && avet<=28) // condition 3
  {
    myservo.write(90);
    lcd.setCursor(0,3);
    lcd.print("RH LOW!");
  }
    else if(h>=70 && h<=90 && avet<22) // condition 4
  {
    myservo.write(90);
    lcd.setCursor(0,3);
    lcd.print("TEMP LOW!");
  }
    else if(h>=70 && h<=90 && avet>28) // condition 5
  {
    myservo.write(180);
    lcd.setCursor(0,3);
    lcd.print("TEMP HIGH!");
  }
    else if(h<70 && avet<22 || h>90 && avet>28) // condition 6
  {
    myservo.write(30);
    lcd.setCursor(0,3);
    lcd.print("CRITICAL!");
  }
 
}