#include <WiFi.h> //library wifi

//pin configuration
// menentukan pin untuk sensor, led, dan Buzzer 
#define trigerPin 12
#define echoPin 13
#define buzzerPin  14

//constants
// menentukan frekuensi nada dan konversi dari cm ke inc
#define pitch 262
#define CM_TO_INCH 0.393701

//variable
//deklarasi variable untuk menyimpan data durasi, jarak dalam sentimeter dan jarak dalam inch
long duration;
float distance;
float distanceInch;

//koneksi WiFi
const char* ssid = "Wokwi-GUEST";
const char* pass = "";

WiFiClient client;

// konfigurasi ubidots 
const char* ubidotsToken = "BBUS-66Em7KwRiH54BSoZJYJf4Ge4Obr0UX";
const char* ubidotsHost = "industrial.api.ubidots.com";
const char* ubidotsPath = "/api/v1.6/devices/wokwi";


//
void setup() {
  // Setup for sensor
  Serial.begin(115200);
  pinMode(trigerPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Setup for Buzzer
  pinMode(buzzerPin, OUTPUT);

  

  // Scan WiFi
  Serial.println("Scan WiFi...");
  int networks = WiFi.scanNetworks();
  if(networks == 0){
    Serial.println("No WiFi Networks!");
  }
  else{
    Serial.print(networks);
    Serial.println("Networks Found!");
    for(int i = 0; i < networks; i++)
      Serial.println(WiFi.SSID());
      delay(10);
  }

  // Connect to WiFi
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED){
    delay(100);
    Serial.println(".");
  }
  Serial.println("WiFi Connected!");
  Serial.println(WiFi.localIP());
}

void loop() {
  // Looping sensor (creating a wave sensor)
  digitalWrite(trigerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigerPin, LOW);

  // Creating duration
  duration = pulseIn(echoPin, HIGH);

  // Calculating distance
  distance = (duration/2) * 0.0343;

  // Convert to inches
  distanceInch = distance * CM_TO_INCH;

  // Consider max width of the door = 200 cm
  if(distance < 10){
    tone(buzzerPin, pitch); // Aktifkan bunyi buzzer
    delay(1000);
    noTone(buzzerPin); // Matikan bunyi buzzer
    delay(100);
  }

  // Print data to Serial
  if(distance < 10){
    Serial.println("WARNING!");
    Serial.println("distance(cm): " + String(distance));
    
    // Send data to Ubidots
    sendToUbidots(distance);
  }
  else{
    Serial.println("AMAN");
  }

  delay(2000);
}

void sendToUbidots(float distanceValue) {
  String postData = String("{\"value\":") + distanceValue + "}";
  
  String headers = String("POST ") + ubidotsPath + " HTTP/1.1\r\n" +
                   "Host: " + ubidotsHost + "\r\n" +
                   "X-Auth-Token: " + ubidotsToken + "\r\n" +
                   "Content-Type: application/json\r\n" +
                   "Connection: close\r\n" +
                   "Content-Length: " + postData.length() + "\r\n\r\n";
  
  client.connect(ubidotsHost, 80);
  client.print(headers);
  client.print(postData);
  delay(100);

  while(client.available()){
    String line = client.readStringUntil('\r');
    Serial.print(line);
  }
  client.stop();
}