#include <Adafruit_Sensor.h>

#include <DHT.h>

#include <DHT_U.h>

#define DHTTYPE    DHT22     // DHT 22

#define DHTPIN 2

DHT_Unified dht(DHTPIN, DHTTYPE);

uint32_t delayMS;

int green = 13;
int yellow = 11;
int red = 9;
int cnt = 0;
int buzzer = 7;
float tmp, humid;


void setup() {

  Serial.begin(9600);

  dht.begin();

  sensor_t sensor;

  delayMS = sensor.min_delay / 1000;

  pinMode(green, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(red, OUTPUT);
  pinMode(buzzer, OUTPUT);

}

 

void loop()

{

  sensors_event_t event;

  dht.temperature().getEvent(&event);

  Serial.print(F("Temperature: "));

  tmp = event.temperature;

  Serial.print(tmp);

  Serial.println(F("°C"));

  dht.humidity().getEvent(&event);

  Serial.print(F("Humidity: "));

  humid = event.relative_humidity;

  Serial.print(humid);

  Serial.println(F("%"));


  // conditions

  if(tmp >=40 || humid >=40){
    digitalWrite(green, LOW);
    digitalWrite(red, LOW);
    digitalWrite(yellow, HIGH);
    cnt++;
  }
  if(tmp <= 10 || humid <=10){
    
    if(cnt==0){
      digitalWrite(green, LOW);
      digitalWrite(yellow, LOW);
    }
    digitalWrite(red, HIGH);
    cnt++;
  }
  if(cnt == 0){
    digitalWrite(green, HIGH);
    noTone(buzzer);
    digitalWrite(red, LOW);
    digitalWrite(yellow, LOW);
  }
  else{
    tone(buzzer,1000);
  }

  cnt = 0;

  delay(delayMS);

}