#include <NewPing.h>
#include <TinyDHT.h>

#define DHTPIN 7       
#define DHTTYPE DHT22   
#define TRIGGER_PIN_1  10
#define ECHO_PIN_1     13
#define TRIGGER_PIN_2  8
#define ECHO_PIN_2     9
#define TRIGGER_PIN_3  5
#define ECHO_PIN_3     6
#define MAX_DISTANCE 400

NewPing sonar1(TRIGGER_PIN_1, ECHO_PIN_1, MAX_DISTANCE);
NewPing sonar2(TRIGGER_PIN_2, ECHO_PIN_2, MAX_DISTANCE);
NewPing sonar3(TRIGGER_PIN_3, ECHO_PIN_3, MAX_DISTANCE);

float hum;    
float temp;   
float duration1; 
float distance1; 
float duration2; 
float distance2; 
float duration3; 
float distance3; 
float soundsp;  
float soundcm;  
int iterations = 7;

DHT dht(DHTPIN, DHTTYPE); 

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

void loop() {
  delay(2000);  
  checkDistance();
}

void checkDistance(){
  hum = dht.readHumidity();  
  temp= dht.readTemperature();  
    
  soundsp = 331.4 + (0.606 * temp) + (0.0124 * hum);
  soundcm = soundsp / 10000;
  
  duration1 = sonar1.ping_median(iterations);
  distance1 = (duration1 / 2) * soundcm;
  
  duration2 = sonar2.ping_median(iterations);
  distance2 = (duration2 / 2) * soundcm;

  duration3 = sonar3.ping_median(iterations);
  distance3 = (duration3 / 2) * soundcm;
  
  Serial.print("Sound: ");
  Serial.print(soundsp);
  Serial.print(" m/s, ");
  Serial.print("Humid: ");
  Serial.print(hum);
  Serial.print(" %, Temp: ");
  Serial.print(temp);
  Serial.print(" C, ");
  
  Serial.print("Distance 1: ");
  if (distance1 >= 400 || distance1 <= 2) {
    Serial.print("Out of range");
  } else {
    Serial.print(distance1);
    Serial.print(" cm");
  }
  
  Serial.print(", Distance 2: ");
  if (distance2 >= 400 || distance2 <= 2) {
    Serial.print("Out of range");
  } else {
    Serial.print(distance2);
    Serial.print(" cm");
  }
  
  Serial.print(", Distance 3: ");
  if (distance3 >= 400 || distance3 <= 2) {
    Serial.print("Out of range");
  } else {
    Serial.print(distance3);
    Serial.print(" cm");
  }
  
  Serial.println();
}