#include <SPI.h> 
#include <Wire.h> 
#include <Adafruit_GFX.h> 
#include <Adafruit_SSD1306.h> 
#include "DHT.h" 
 
#define DHTPIN 18 
#define DHTTYPE DHT22 
 
 
int ledblue = 2; //initialized and resign variable led to pin D2 
int ledpurple = 4; 
 
DHT dht(DHTPIN, DHTTYPE); 
 
const int trigPin = 23; 
const int echoPin = 19; 
 
//define sound speed in cm/us 
#define SOUND_SPEED 0.034 
#define CM_TO_INCH 0.393701 
 
long duration; 
float distanceCm; 
float distanceInch; 
 
 
 
#define SCREEN_WIDTH 128 // OLED display width, in pixels 
#define SCREEN_HEIGHT 64 // OLED display height, in pixels 
 
// Declaration for SSD1306 display connected using I2C 
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin) 
#define SCREEN_ADDRESS 0x3C 
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); 
 
 
void setup() { 
  // put your setup code here, to run once: 
  Serial.begin(115200);  
  pinMode(ledblue, OUTPUT); 
  pinMode(ledpurple, OUTPUT); 
 
  dht.begin(); 
 
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output 
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input 
 
   Serial.begin(115200); 
 
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally 
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {  
    Serial.println(F("SSD1306 allocation failed")); 
    for(;;); // Don't proceed, loop forever 
  } 
 
  // Show initial display buffer contents on the screen -- 
  // the library initializes this with an Adafruit splash screen. 
  display.display(); 
  delay(2000); // Pause for 2 seconds 
 
  // Clear the buffer 
  display.clearDisplay(); 
 
 
  }
void loop() 
 {   
  //put your main code here,to run repeatly:   
  Serial.println("Hello,ESP32!");   
  delay(1000); //speedup simulation 1saat=1000   
  digitalWrite(ledblue, HIGH);   
  delay(3000);   
  digitalWrite(ledpurple, HIGH); 
  delay(2000);   
  digitalWrite(ledblue, LOW);  
   delay(2000);   
   digitalWrite(ledpurple, LOW);    
   // Wait a few seconds between measurements.  
    delay(2000);  

  // Reading temperature or humidity takes about 250 milliseconds!   
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)  
   float h = dht.readHumidity();  
    // Read temperature as Celsius (the default)  
     float t = dht.readTemperature();   
     // Read temperature as Fahrenheit (isFahrenheit = true)  
      float f = dht.readTemperature(true);  
   // Compute heat index in Fahrenheit (the default)  
    float hif = dht.computeHeatIndex(f, h);   
    // Compute heat index in Celsius (isFahreheit = false)   
    float hic = dht.computeHeatIndex(t, h, false);   
     Serial.print(F("Humidity: "));   
     Serial.print(h); 
  Serial.print(F("%  Temperature: "));   
  Serial.print(t);   
  Serial.print(F("°C "));   
  Serial.print(f);  
   Serial.print(F("°F  Heat index: "));   
   Serial.print(hic);   
   Serial.print(F("°C "));  
    Serial.print(hif); 
  Serial.println(F("°F"));   
  
   // Clears the trigPin   
   digitalWrite(trigPin, LOW);   
   delayMicroseconds(2);   
   // Sets the trigPin on HIGH state for 10 micro seconds  
    digitalWrite(trigPin, HIGH);   
    delayMicroseconds(10); 
  digitalWrite(trigPin, LOW);    
  
  // Reads the echoPin, returns the sound wave travel time in microseconds   
  duration = pulseIn(echoPin, HIGH);   

  // Calculating the distance   
  distanceCm = duration * 0.034 / 2;  

  //Convert to inches   
  distanceInch = distanceCm * CM_TO_INCH;  
   // Prints the distance on the Serial Monitor   
   Serial.print("Distance (cm): ");  
    Serial.println(distanceCm); 
    Serial.print("Distance (inch): ");   
    Serial.println(distanceInch);  

 display.clearDisplay();   
  display.setTextSize(2);             // Normal 1:1 pixel scale   
  display.setTextColor(WHITE);        // Draw white text  
  display.setCursor(0,0);             // Start at top-left corner 
  display.println(F("Distance:"));  
  display.print(distanceCm); 
  display.println(F("cm")); 
  display.print(distanceInch);  
  display.println(F("inch")); 

  display.display();   
  delay(2000); }