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

#define DHTTYPE DHT22
#define PIN_DHT 25

DHT dht(PIN_DHT, DHTTYPE);

#define trig 32
#define echo 33

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const String apiKey = "Z9JC08U80XLRMP4I";   
const long channelID = 2720849;
WiFiClient client;

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

    pinMode(trig, OUTPUT);
    pinMode(echo, INPUT);

    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }
    Serial.println("\nWiFi tersambung");
    ThingSpeak.begin(client);
}

void loop() {
    if (WiFi.status() != WL_CONNECTED) {
        Serial.println("Menghubungkan ulang ke WiFi...");
        while (WiFi.status() != WL_CONNECTED) {
            delay(500);
            Serial.print(".");
        }
        Serial.println("\nWiFi tersambung kembali");
    }

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

    if (isnan(suhu) || isnan(kelembaban)) {
        Serial.println("Gagal membaca dari sensor DHT22!");
        return;
    }

    long duration, jarak;

    digitalWrite(trig, LOW);
    delayMicroseconds(2);
    digitalWrite(trig, HIGH);
    delayMicroseconds(10);
    digitalWrite(trig, LOW);

    duration = pulseIn(echo, HIGH);
    jarak = duration * 0.0343 / 2; 

    Serial.print("Jarak: ");
    Serial.print(jarak);
    Serial.println(" cm");

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

    ThingSpeak.setField(1, suhu);  
    ThingSpeak.setField(2, kelembaban);  
    ThingSpeak.setField(3, jarak);  

    if (ThingSpeak.writeFields(channelID, apiKey.c_str()) == 200) {
        Serial.println("Data berhasil dikirim ke ThingSpeak");
    } else {
        Serial.println("Gagal mengirim data ke ThingSpeak");
    }

    delay(15000);
}