#include "DHT.h"
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

#define pumpPin 8
#define fanPin 9
#define lampPin 10
#define dhtPin 2
#define DHTTYPE DHT22
DHT dht(dhtPin, DHTTYPE);
int h;
int t;
unsigned long curTime = 0;
unsigned long pPre = 0;
unsigned long pfanPre = 0;
unsigned long plampPre = 0;
int pTime = 1000;
int pfanTime = 1000;
int plampTime = 1000;

int ledPumpState = LOW;
int ledFanState = LOW;
int ledLampState = LOW;

void setup() {
  //Serial.begin(115200);
  pinMode(pumpPin, OUTPUT);
  pinMode(fanPin, OUTPUT);
  pinMode(lampPin, OUTPUT);
  pinMode(dhtPin, INPUT);
  dht.begin();
  lcd.begin(20, 4);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(3, 0);
  lcd.print("Hum.  :  "  );
  lcd.setCursor(3, 1);
  lcd.print("Temp. :  "  );
}

void loop() {
  curTime = millis();
  h = dht.readHumidity();
  t = dht.readTemperature();
  lcd.setCursor(13, 0);
  lcd.print(h);
  lcd.print("   ");
  lcd.setCursor(13, 1);
  lcd.print(t);
  lcd.print("   ");
  if (h <= 40) {
    if (curTime - pPre >= pTime) {
      pPre = curTime;
      if (ledPumpState == LOW) {
        ledPumpState = HIGH;
        pTime = 3000;
      } else {
        ledPumpState = LOW;
        pTime = 500;
      }
      digitalWrite(pumpPin, ledPumpState);
    }
  } else if (h > 40 && h < 80) {
    if (curTime - pPre >= pTime) {
      pPre = curTime;
      if (ledPumpState == LOW) {
        ledPumpState = HIGH;
        pTime = 1000;
      } else {
        ledPumpState = LOW;
        pTime = 2000;
      }
      digitalWrite(pumpPin, ledPumpState);
    }
  } else {
    digitalWrite(pumpPin, LOW);
  }

  ///////////////// lamp off, fan on (t>40), lamp on, fan off (t<20)
  if (t <= 20) {
    if (curTime - plampPre >= plampTime) {
      plampPre = curTime;
      if (ledLampState == LOW) {
        ledLampState = HIGH;
        plampTime = 1000;
      } else {
        ledLampState = LOW;
        plampTime = 1000;
      }
      digitalWrite(lampPin, ledLampState);
      digitalWrite(fanPin, LOW);
    }
  } else if (t >= 40) {
    if (curTime - pfanPre >= pfanTime) {
      pfanPre = curTime;
      if (ledFanState == LOW) {
        ledFanState = HIGH;
        pfanTime = 1000;
      } else {
        ledFanState = LOW;
        pfanTime = 1000;
      }
      digitalWrite(fanPin, ledFanState);
      digitalWrite(lampPin, LOW);
    }
  } else {
    digitalWrite(fanPin, LOW);
    digitalWrite(lampPin, LOW);
  }

}