#include<DHT.h>
#define d1pin 4
#define d2pin 2
#define LED 21
#define TRIG1_PIN 18 // ESP32 pin GIOP23 connected to Ultrasonic Sensor's TRIG pin
#define ECHO1_PIN 19 // ESP32 pin GIOP22 connected to Ultrasonic Sensor's ECHO pin
#define TRIG2_PIN 23 // ESP32 pin GIOP23 connected to Ultrasonic Sensor's TRIG pin
#define ECHO2_PIN 22 // ESP32 pin GIOP22 connected to Ultrasonic Sensor's ECHO pin
#define DHTTYPE1 DHT22  // defining type of DHT sensor to DHT 11
#define DHTTYPE2 DHT22

DHT dht1(d1pin,DHTTYPE1);  // DHT
DHT dht2(d2pin,DHTTYPE2);


float duration_us1, distance_cm1;
float duration_us2, distance_cm2;
int count = 9;
void setup() {
  Serial.begin(9600);

  delay(10);
  dht1.begin();
  dht2.begin();


// configure the trigger pin to output mode
  pinMode(TRIG1_PIN, OUTPUT);
  // configure the echo pin to input mode
  pinMode(ECHO1_PIN, INPUT);

// configure the trigger pin to output mode
  pinMode(TRIG2_PIN, OUTPUT);
  // configure the echo pin to input mode
  pinMode(ECHO2_PIN, INPUT);

pinMode(LED, OUTPUT);



}


void loop() {
  // code to sense data using dht11

  float t1=dht1.readTemperature();
  float h1=dht1.readHumidity();
 float t2=dht2.readTemperature();
  float h2=dht2.readHumidity();
  Serial.print("Temperature");
  Serial.print((t1+t2)/2);
  Serial.print("*C    ");
  Serial.print("humidity");
  Serial.print((h1+h2)/2);
  Serial.print("%"); 
  Serial.print("\n");
 delay(2000);


digitalWrite(TRIG1_PIN, HIGH);
digitalWrite(TRIG2_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG1_PIN, LOW);
digitalWrite(TRIG2_PIN, LOW);

// measure duration of pulse from ECHO pin
  duration_us1 = pulseIn(ECHO1_PIN, HIGH);
  duration_us2 = pulseIn(ECHO2_PIN, HIGH);
  // calculate the distance
  distance_cm1 = 0.017 * duration_us1;
distance_cm2 = 0.017 * duration_us2;

if(distance_cm1 <35 && distance_cm2 >=35){
     count++;
    }
else if( distance_cm1>=35 && distance_cm2 <35){
count--;
}
if(((t1+t2)/2)>=25){
     digitalWrite(LED, HIGH);
 }
else{
     digitalWrite(LED, LOW);
}
Serial.print("No. of people in the room are ");
Serial.print(count);
Serial.print("\n");


  }