// +++++++++++++++++++++++++++++++++++++++ DHT22 Humidity seensor Library +++++++++++++++++++++++++++++++++++++++
#include<dht.h> // Library for Humidity sensor
#define dht_apin 7 // Sensor set on pin No 7
dht DHT; // Instance of dht called DHT created


// +++++++++++++++++++++++++++++++++++++++ Oled Display SSD1306 Library +++++++++++++++++++++++++++++++++++++++
#include  <Wire.h> // Wire library for I2C sensor
#include <Adafruit_GFX.h> // Adafruit GFX graphic library
#include <Adafruit_SSD1306.h> // Library for controlling SSD1306 Display

// Display Screen set up
#define  SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 64 

// Instance for screen is set as oled. Widht, Heihgt and connection set for display - reset pin
Adafruit_SSD1306 oled(SCREEN_WIDTH,  SCREEN_HEIGHT, &Wire, -1);

// +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// +++++++++++++++++++++++++++++++++++++++ Program Start +++++++++++++++++++++++++++++++++++++++
// +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

void setup(){
  // Entry point for program, it will run just once

  Serial.begin(9600); // Initiate serial communication at baud rate of 9600 bits per second
  Serial.println("DHT11 Humidity & temperature Sensor"); // Console log for debugging 
  splash(); // Function Splash Screen is called

}


void splash(){
  // Splash screen for display oled
  if (!oled.begin(SSD1306_SWITCHCAPVCC,  0x3C)) { // loop that check if the monitor is correctly attached to the board
    Serial.println(F("SSD1306 allocation failed"));
    while (true);
  }
        
  oled.clearDisplay(); // Clear Eventual Output on display

  // ++ Print Temp & Humidity ++
  oled.setTextSize(1); // Set a font size for the text
  oled.setTextColor(WHITE); // Set a color size for the text
  oled.setCursor(0, 10); // Position the cusror to a specific point 
  oled.print("Temp  & Humidity "); // Pint on display

  // ++ Print Mauro DC (Student Name) ++
  oled.setTextSize(2);          
  oled.setTextColor(WHITE);    
  oled.setCursor(0, 40);       
  oled.println("Mauro DC");

  oled.display(); // The output is set on display

  delay(500); // Delay time to ensure sensor start
  
}
 
void loop(){
    // Loop for reading the humidity and temperature from DHT22 sensor 
    DHT.read22(dht_apin); // DHT library set read temperature and humidity data from the sensor

    // Print statements for humidity and temperature on console
    Serial.print("Current humidity = ");
    Serial.print(DHT.humidity);
    Serial.print("%  ");
    Serial.print("temperature = ");
    Serial.print(DHT.temperature);  
    Serial.println("C  ");
    
    delay(2000); // 2 second pause from each reading
    Temp_and_Humidity(); // Function for displaing output
  
}

void Temp_and_Humidity(){
  // Temperature and humidity read on loop function are called into this function and displayed on the OLED screen
  
  oled.clearDisplay();
  
  // ++ Temperature Setting ++
  oled.setTextSize(1);          
  oled.setTextColor(WHITE);    
  oled.setCursor(0, 10); 
  oled.println("Temp(C)  : ");
  
  oled.setTextSize(2);          
  oled.setTextColor(WHITE);    
  oled.setCursor(50, 20); 
  oled.println(DHT.temperature);

  // ++ Humidity Setting ++
  oled.setTextSize(1);          
  oled.setTextColor(WHITE);    
  oled.setCursor(0, 40);       
  oled.println("Humidity(%) : ");

  oled.setTextSize(2);          
  oled.setTextColor(WHITE);    
  oled.setCursor(50, 50); 
  oled.println(DHT.humidity);
  oled.setCursor(60,  90);
  oled.println("%");


  oled.display(); // Function for displaing output
  
}