#include <Adafruit_SSD1306.h>
#include <DHT.h>

#define DHTTYPE DHT22   // DHT11 / DHT22

const int DHT_PIN = 13; // any GPIO-Pin

DHT dhtSensor(DHT_PIN, DHTTYPE);      // create dht-sensor instance

float temperature;  // variable to save temperature value
float humidity;     // variable to save humidity value

#define OLED_RESET 0        // GPIO0
#define OLED_I2C_ADDR 0x3C  // set I2C-address of the OLED-Display (see datasheet)

Adafruit_SSD1306 oledDisplay(OLED_RESET); // create oled-display instance

int minuteCounter = 0; // initialize minute-counter
int secondCounter = 0; // initialize second-counter

void setup() {
  // initialize oled-display
  oledDisplay.begin(SSD1306_SWITCHCAPVCC, OLED_I2C_ADDR);

  // set text settings
  oledDisplay.setTextSize(1);
  oledDisplay.setTextColor(WHITE);

  // DHT setup
  pinMode(DHT_PIN, INPUT); // set dht-data-pin as input

  dhtSensor.begin(); // initialize dht-sensor

  // set baudrate for serial-communication-interface (SPI)
  Serial.begin(115200); // wokwi standard baud-rate
  
  // output message over serial-communication-interface
  Serial.println("program running ...");
}

void loop() {
  oledDisplay.clearDisplay();

  // read sensor measurements
  temperature = dhtSensor.readTemperature();
  humidity = dhtSensor.readHumidity();

  oledDisplay.setCursor(0,13);
  oledDisplay.println("H: " + String(humidity, 1) + " % " + "T: " + String(temperature, 1) + " C");
  oledDisplay.setCursor(0,25);

  String secondCounterStr;
  if (secondCounter < 10) secondCounterStr = "0";
  secondCounterStr += String(secondCounter);

  String minuteCounterStr;
  if (minuteCounter < 10) minuteCounterStr = "0";
  minuteCounterStr += String(minuteCounter);

  oledDisplay.println("uptime: " + minuteCounterStr + ":" + secondCounterStr);

  oledDisplay.display();

  secondCounter = secondCounter + 1;
  if (secondCounter == 60) {
    secondCounter = 0;
    minuteCounter = minuteCounter + 1;
  }

  delay(1000); // pause for ??? seconds (???.000 milliseconds)
}