#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd (0x27, 20, 4);
#include "DHT.h"
#define DHTPIN 2
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
#include<Servo.h>
Servo arm;
int pos;

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

  lcd.init();
  lcd.backlight();

  dht.begin();
  arm.attach(9);
}

void loop()
{
  float rh = dht.readHumidity();
  const float BETA = 3950;
  int rt1 = analogRead(A0);
  int rt2 = analogRead(A1);
  int rt3 = analogRead(A2);

  float t1 = 1/(log(1/(1023.0/rt1-1))/BETA+1.0/298.15)-273.15;
  float t2 = 1/(log(1/(1023.0/rt2-1))/BETA+1.0/298.15)-273.15;
  float t3 = 1/(log(1/(1023.0/rt3-1))/BETA+1.0/298.15)-273.15;
  float avt = (t1+t2+t3)/3.0;

  if (rh >= 70 && avt >= 22 && rh <= 90 && avt >= 28)
  {
    lcd.setCursor(0,3);
    lcd.print("optimal condition");
  }
  else if (rh < 70 && avt >= 22 && avt <= 28)
  {
    lcd.setCursor(0,3);
    lcd.print("relative humidity low");
  }
  else if (rh >= 70 && rh <= 90 && avt < 22)
  {
    lcd.setCursor(0,3);
    lcd.print("temperature low");
  }
  else if (rh > 90 && avt >= 22 && avt <= 28)
  {
    lcd.setCursor(0,3);
    lcd.print("relative humidity high");
  }
  else if (rh >= 70 && rh <=90 && avt > 28)
  {
    lcd.setCursor(0,3);
    lcd.print("temperature high");
  }
  else {
    lcd.setCursor(0,3);
    lcd.print("critical condition");
    arm.write(30);
  }

  lcd.setCursor(0,0);
  lcd.print("ave T  ");
  lcd.setCursor(3,0);
  lcd.print(avt, 1);
  lcd.setCursor(10,0);
  lcd.print("RH  ");
  lcd.setCursor(13,0);
  lcd.print(rh, 1);
  lcd.setCursor(0,1);
  lcd.print("T1  ");
  lcd.setCursor(3,1);
  lcd.print(t1,1);
  lcd.setCursor(10,1);
  lcd.print("T2  ");
  lcd.setCursor(13,1);
  lcd.print(t2,1);
  lcd.setCursor(0,2);
  lcd.print("T3  ");
  lcd.setCursor(3,2);
  lcd.print(t3,1);
  
  delay(1000);
}