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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

#define DHTPIN 2
#define DHTTYPE DHT22

#define biru 3
#define kuning 4
#define merah 5
#define buzzer 6

Adafruit_SSD1306 oled(128, 64, &Wire, -1);
DHT dht(DHTPIN, DHTTYPE);

String displayString;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);  
  pinMode(biru, OUTPUT);
  pinMode(kuning, OUTPUT);
  pinMode(merah, OUTPUT); 
  pinMode(buzzer, OUTPUT);
  
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    while (true);
  }

  delay(2000);
  oled.clearDisplay();

  oled.setTextSize(2); 
  oled.setTextColor(WHITE);
  oled.setCursor(0, 10);

  dht.begin();

  displayString.reserve(10);
}

void loop() {
  // put your main code here, to run repeatedly:
  
  float tempC = dht.readTemperature();

  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);
  }

}

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);

  oled.clearDisplay();
  oled.setCursor((SCREEN_WIDTH - width) / 2, (SCREEN_HEIGHT - height) / 2);
  oled.println(text);
  oled.display();
}