/**
   ESP32 + DHT22 Example for Wokwi
   
   https://wokwi.com/arduino/projects/322410731508073042
*/

#include "DHTesp.h"
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Sound speed in air
#define SOUND_SPEED 340
#define TRIG_PULSE_DURATION_US 10

const int trig_pin = 5;
const int echo_pin = 18;

const int DHT_PIN = 15;

DHTesp dhtSensor;

// set the LCD number of columns and rows
int lcdColumns = 16;
int lcdRows = 2;

// set LCD address, number of columns and rows
// if you don't know your display address, run an I2C scanner sketch
LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);  

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

long ultrason_duration;
float distance_cm;

void setup() {
  // Wire.begin();
  Serial.begin(115200);

  pinMode(trig_pin, OUTPUT); // We configure the trig as output
  pinMode(echo_pin, INPUT); // We configure the echo as input

  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  // Serial.println("\nI2C Scanner");

  // initialize LCD
  lcd.init();
  // turn on LCD backlight                      
  lcd.backlight();

    if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(2000);
  display.clearDisplay();

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 10);
  // Display static text
  display.println("Hello, world!");
  display.display(); 
  
}

void loop() {
  display.clearDisplay(); 
  // display.display(); 
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("---");
  // delay(1000);
  // set cursor to first column, first row
  lcd.setCursor(0, 0);
  // print message
  lcd.print("Hello, World!");
  display.setCursor(5, 10);
  // Display static text
  display.println("tes");
  delay(1000);
  // clears the display to print new message
  lcd.clear();
  display.display(); 
  // set cursor to first column, second row
  lcd.setCursor(0,1);
  lcd.print("Hello, World!");

  display.setCursor(3, 40);
  // Display static text
  display.println("tes");

 // Set up the signal
  digitalWrite(trig_pin, LOW);
  delayMicroseconds(2);
 // Create a 10 µs impulse
  digitalWrite(trig_pin, HIGH);
  delayMicroseconds(TRIG_PULSE_DURATION_US);
  digitalWrite(trig_pin, LOW);

  // Return the wave propagation time (in µs)
  ultrason_duration = pulseIn(echo_pin, HIGH);

//distance calculation
  distance_cm = ultrason_duration * SOUND_SPEED/2 * 0.0001;

  // We print the distance on the serial port
  Serial.print("Distance (cm): ");
  Serial.println(distance_cm);

  delay(1000);
  lcd.clear(); 
  display.display();   
}