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

#define DHTPIN 4      
#define DHTTYPE DHT22 

DHT dht(DHTPIN, DHTTYPE);

const int ledMerahPin = 11;   
const int ledKuningPin = 12;  
const int ledHijauPin = 13;  
const int buzzerPin = 7;    

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64  
#define OLED_RESET -1     

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  Serial.begin(9600);
  pinMode(ledMerahPin, OUTPUT);
  pinMode(ledKuningPin, OUTPUT);
  pinMode(ledHijauPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  dht.begin();

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

  display.display();
  delay(1000);
  display.clearDisplay();
}

void loop() {
  delay(1000); 

  float suhu = dht.readTemperature();  
  float kelembaban = dht.readHumidity();  

  
  if (isnan(suhu) || isnan(kelembaban)) {
    Serial.println("Gagal membaca sensor!");
    return;
  }

  Serial.print("Suhu: ");
  Serial.print(suhu);
  Serial.print(" °C | Kelembaban: ");
  Serial.print(kelembaban);
  Serial.println(" %");

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Suhu: ");
  display.print(suhu);
  display.println(" C");
  display.display();

  if (suhu > 28) {
    digitalWrite(ledMerahPin, HIGH);   
    digitalWrite(ledKuningPin, LOW);   
    digitalWrite(ledHijauPin, LOW);    
    tone(buzzerPin, 500);              
    delay(100);                    
    noTone(buzzerPin);                 
  } else if (suhu > 20 && suhu <= 28) {
    digitalWrite(ledMerahPin, LOW);    
    digitalWrite(ledKuningPin, HIGH);  
    digitalWrite(ledHijauPin, LOW);   
    noTone(buzzerPin);                
  } else {
    digitalWrite(ledMerahPin, LOW);   
    digitalWrite(ledKuningPin, LOW);   
    digitalWrite(ledHijauPin, HIGH);  
    noTone(buzzerPin);                 
  }
}