#define BLYNK_TEMPLATE_ID "TMPL6ifkPcDPX"
#define BLYNK_TEMPLATE_NAME "Testing"
#define BLYNK_AUTH_TOKEN "HYaN8mUqCmYkWKaqKuDcuTRPIZiDrLBI"

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <BlynkSimpleEsp32.h>

//Oled SCL and SDA require to be connected to an i2c usually pin 21 and 22

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

#define DHTPIN 13     // Digital pin connected to the DHT sensor 
#define DHTTYPE DHT22     // DHT 22 (AM2302)

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
DHT dht(DHTPIN, DHTTYPE);
BlynkTimer timer;

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

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

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(500);
  display.clearDisplay();
  display.setTextColor(WHITE);

  Blynk.begin(auth, ssid, pass);
  timer.setInterval(2000L, sendDHTData);
}

void sendDHTData(){
  delay(1000);

  //read temperature and humidity
  float t = dht.readTemperature();
  float h = dht.readHumidity();
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
  }
  // 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();

  Blynk.virtualWrite(V1, h);
  Blynk.virtualWrite(V0, t);


  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print(" % , ");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" °C , ");
}

void loop() {
  Blynk.run();
  timer.run();   
}