#include <WiFi.h>
#include <WiFiUdp.h>
#include <DHT.h>
#include <ThingSpeak.h>

// Kredensial WiFi 
const char* ssid = "Wokwi_GUEST";
const char* password = "";

// ThingSpeak
unsigned long myChannelNumber = 2583539; 
const char* myWriteAPIKey = "MZDYEGOUFP0FOK87";

// DHT sensor
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Ultrasonic sensor
#define TRIGPIN 5
#define ECHOPIN 18

// Relay dan servo
#define RELAYPIN 2
#define SERVOPIN 13

WiFiClient client;

void setup() { 
  Serial.begin(115200); 
  dht.begin();

  pinMode(TRIGPIN, OUTPUT); 
  pinMode(ECHOPIN, INPUT);

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Menghubungkan ke Wi-Fi...");
  }
  Serial.println("Terhubung ke Wi-Fi");

  ThingSpeak.begin(client);
}

void loop() {
  // Membaca sensor DHT
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Membaca sensor Ultrasonik
  long duration;
  float distance;
  digitalWrite(TRIGPIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGPIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGPIN, LOW); 
  duration = pulseIn(ECHOPIN, HIGH); 
  distance = (duration / 2.0) / 29.1;

  // Print nilai sensor
  Serial.print("Suhu: ");
  Serial.print(temperature);
  Serial.print(" °C, Kelembapan: ");
  Serial.print(humidity);
  Serial.print("%, Jarak: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Kirim data ke ThingSpeak
  ThingSpeak.setField(1, temperature);
  ThingSpeak.setField(2, humidity);
  ThingSpeak.setField(3, distance);

  int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if (x == 200) {
    Serial.println("Update channel berhasil.");
  } else {
    Serial.println("Masalah update channel. Kode kesalahan HTTP: " + String(x));
  }
  
  delay(20000); // Waktu update data ke ThingSpeak 20 detik
}