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

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


#define DHTPIN 2 // pin connected to DHT22 sensor
#define DHTTYPE DHT22
#define biru 3
#define kuning 4
#define merah 5
#define buzzer 6

Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1); // create SSD1306 display object connected to I2C
DHT dht(DHTPIN, DHTTYPE);

String displayString;

void setup() {
  Serial.begin(9600);
  pinMode(biru, OUTPUT);
  pinMode(kuning, OUTPUT);
  pinMode(merah, OUTPUT);
  pinMode(buzzer, OUTPUT);

  // initialize OLED display with address 0x3C for 128x64
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    while (true);
  }

  delay(2000);         // wait for initializing
  oled.clearDisplay(); // clear display

  oled.setTextSize(2);      // text size
  oled.setTextColor(WHITE); // text color
  oled.setCursor(0, 10);    // position to display

  dht.begin();              // initialize DHT22 the temperature and humidity sensor

  displayString.reserve(10); // to avoid fragmenting memory when using String
}

void loop() {
  float tempC = dht.readTemperature(); // read temperature

  // check if any reads failed
  if (isnan(tempC)) {
    displayString = "Failed";
  } else {
    if(tempC >35){
      Serial.print(tempC);
      Serial.println(" SUHU PANAS");
      digitalWrite(biru, LOW);
      digitalWrite(kuning, LOW);
      digitalWrite(merah, HIGH);
      displayString  = "SUHU PANAS";
      tone(buzzer, 150);
      delay(200);
      noTone(buzzer);
      delay(200);
    }else if(tempC>=29){
      Serial.print(tempC);
      Serial.println(" SUHU CUKUP");
      digitalWrite(biru, LOW);
      digitalWrite(kuning, HIGH);
      digitalWrite(merah, LOW);
       displayString  = "SUHU CUKUP";
    }else {
      Serial.print(tempC);
      Serial.println(" SUHU RENDAH");
      digitalWrite(biru, HIGH);
      digitalWrite(kuning, LOW);
      digitalWrite(merah, LOW);
       displayString  = "SUHU RENDAH";
    }
    oledDisplayCenter(displayString);
  }

  
   // display temperature on OLED
}

void oledDisplayCenter(String text) {
  int16_t x1;
  int16_t y1;
  uint16_t width;
  uint16_t height;

  oled.getTextBounds(text, 0, 0, &x1, &y1, &width, &height);

  // display on horizontal and vertical center
  oled.clearDisplay(); // clear display
  oled.setCursor((SCREEN_WIDTH - width) / 2, (SCREEN_HEIGHT - height) / 2);
  oled.println(text); // text to display
  oled.display();
}