#include<DHT.h>

#define DHTPIN 13
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  // put your setup code here, to run once:
  pinMode(2, INPUT);
  pinMode(3, OUTPUT);
  dht.begin();

  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(3, HIGH);
  delayMicroseconds(10);
  digitalWrite(3, LOW);
  float t, d;
  t = pulseIn(2, HIGH);
  // Formula 1
  // d = (t / (29 *  2));

  // formula 2 - more accurate
  d = (t * 0.0343) / 2;


  float humi = dht.readHumidity();
  float temp = dht.readTemperature();

  Serial.print("Time: ");
  Serial.print(t);
  Serial.println(" microsec");
  Serial.print("Distance: ");
  Serial.print(d);
  Serial.println("cm");  
  Serial.print("Temp: ");
  Serial.print(temp);
  Serial.println(" C");
  Serial.print("Humidity: ");
  Serial.println(humi);

  delay(2000);
}