#include <Wire.h>             // library i2c
#include <Adafruit_GFX.h>     // library buat garis2 dasar
#include <Adafruit_SSD1306.h> // library buat oled ssd1306
#include <Adafruit_Sensor.h>  // library buat konfig sensor ke oled
#include <DHT.h>              // library buat sensor dht

#define SCREEN_WIDTH 128      // definisi lebar oled, 123 pixel
#define SCREEN_HEIGHT 64      // definisi panjang oled, 64 pixel
#define led_ijo 25            // definisi pin led ijo di pin d25
#define led_merah 27          // definisi pin led merah di pin d27
#define buzzer 5              // definisi pin buzzer di pin d5

// deklarasi display ssd1306 konek ke i2c (SDA, SCL, pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

#define DHTPIN 14              // definisi dht di pin d14
#define DHTTYPE    DHT22       // definisi dht yg dipakai dht22

DHT dht(DHTPIN, DHTTYPE);     // deklarasi pin dht dan tipe dht

void setup() {
  Serial.begin(9600);          // mulai dengan 9600 braud speed

  dht.begin();                 // sensor dht mulai

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(2000);
  display.clearDisplay();
  display.setTextColor(WHITE);
  pinMode(led_ijo, OUTPUT);
  pinMode(led_merah, OUTPUT);
  pinMode(buzzer, OUTPUT);
}

void loop() {
  delay(500);

  //read temperature and humidity
  float s = dht.readTemperature();
  float h = dht.readHumidity();
  if (isnan(h) || isnan(s)) {
    Serial.println("Failed to read from DHT sensor!");
  }
  // clear display
  display.clearDisplay();
  
  // display temperature
  display.setTextSize(1);
  display.setCursor(0,0);
  display.print("Suhu: ");
  display.setTextSize(2);
  display.setCursor(0,10);
  display.print(s);
  display.print(" ");
  display.setTextSize(1);
  display.cp437(true);
  display.write(167);
  display.setTextSize(2);
  display.print("C");
  
  if (s <20) {
    digitalWrite(led_merah, HIGH);
    digitalWrite(led_ijo, LOW);
    display.println(s);
    display.display();
    tone(buzzer, 1000);
    delay(100);
    tone(buzzer, 500);
    delay(100);
  }

  else if (s <=25 and s >=20){
    digitalWrite(led_merah, LOW);
    digitalWrite(led_ijo, HIGH);
    display.println(s);
    display.display();
    tone(buzzer, 0);
    delay(100);
  }

  else if (s >25){
    digitalWrite(led_merah, HIGH);
    digitalWrite(led_ijo, LOW);
    display.println(s);
    display.display();
    tone(buzzer, 1000);
    delay(100);
    tone(buzzer, 500);
    delay(100);
  }

   else {
    digitalWrite(led_merah, LOW);
    digitalWrite(led_ijo, LOW);
    display.println(s);
    display.display();
   }
  // display humidity
  display.setTextSize(1);
  display.setCursor(0, 35);
  display.print("Kelembaban: ");
  display.setTextSize(2);
  display.setCursor(0, 45);
  display.print(h);
  display.print(" %"); 
  display.display(); 

  
}