#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>

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

// Declaration for an SSD1306 display connected to 12C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

#define DHTPIN 15// Digital pin connected to the DHT sensor

// Uncomment the type of sensor in use:
#define DHTTYPE DHT11// DHT 11
//#define DHTTYPE DHT22 //DHT 22 （AM2302）
//#define DHTTYPE DHT21 // DHT 21 (A2301)

DHT dht (DHTPIN, DHTTYPE) ;

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

dht. begin();

if(display.begin(SSD1306_SWITCHCAPVCC, 0X3C)) {
Serial.println(F("SSD1306 allocation falled"));
for(;;);
}

display.clearDisplay();
display.setTextColor (WHITE);
}

void loop() {


//read temperature and humidity
float t = dht.readTemperature();
float h = dht.readHumidity();


// clear display
display.clearDisplay();

//display temperature
display.setTextSize(1);
display.setCursor(0,0);
display.print("Temperature: ");
display.setTextSize(2);
display.setCursor (0,10);
display.print(t);
display.print(" ");
display.setTextSize(1);
display.cp437(true);
display.write(167);
display.setTextSize(2);
display.print("C");


//display humidity
display.setTextSize(1);
display.setCursor(0,35);
display.print("Humidity: ");
display.setTextSize(2);
display.setCursor (0,45);
display.print(h);
display.print(" %");

display.display();
}