const int trigPin = 5;
const int echoPin = 18;

#include "DHT.h"


#define DHTPIN 4     
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701   

#define BUZZZER_PIN  23


long duration;
float distanceCm;
float distanceInch;



void setup() {
  Serial.begin(9600);
  Serial.println("Start!");

  pinMode(trigPin, OUTPUT); 
  pinMode(echoPin, INPUT);

  dht.begin();

  pinMode(13, OUTPUT);
  pinMode(23, OUTPUT);
}

void loop() {
 
  delay(10);

  
  float h = dht.readHumidity();
 
  float t = dht.readTemperature();
  

  Serial.print("Humidity: ");
  Serial.print(h);
 
  Serial.print("         Temperature: ");
  Serial.print(t);
  Serial.println("");


  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  duration = pulseIn(echoPin, HIGH);

  distanceCm = duration * SOUND_SPEED/2;

  distanceInch = distanceCm * CM_TO_INCH;

  Serial.print("Distance (cm): ");
  Serial.print(distanceCm);
  
  Serial.print("     Distance (inch): ");
  Serial.print(distanceInch);
  Serial.println("");
  
  delay(1000);



  if(distanceCm > 200){
    digitalWrite(13, HIGH);
    delay(1000);
    digitalWrite(13, LOW);
    delay(1000);

  }else{
    digitalWrite(13, LOW);
  }


  if(h>33 && t<40){
    tone(23, 262, 250);
    delay(1000);


  }else{
    tone(23, 0,0);
    delay(1000);
  }
}