#include <ESP32Servo.h>
#include <WiFi.h>
#include<HTTPClient.h>
#define WIFI_SSID                      "Wokwi-GUEST"
#define WIFI_PASSWORD                   ""

#define TRIG_PIN  23  // PIN triger ultrasonik
#define ECHO_PIN  22  // PIN echo utrasonik
#define SERVO_PIN 26  // pin PWM motor servo
#define DISTANCE_THRESHOLD  50 // batasjarak

Servo servo; // create servo object to control a servo
const char* ssid = "Wokwi-GUEST";
const char* password = "";

String serverName = "https://api.thingspeak.com/update?api_key=S1SETLSIHHOMUXSI&field1=0";
String serverName2 = "https://api.thingspeak.com/channels/2364097/feeds/last.json?api_key=FCARSJ9DWTR7CJXP";


// variables will change:
float duration_us, distance_cm;

void setup() {
  Serial.begin (9600);       // inisialisasi serial port
  WiFi.begin(ssid, pass);
  while (WiFi.status()!=WL_CONNECTED){
    delay(500);
    Serial.print(".");
  }
  Serial.println("Connected to WiFi");

  pinMode(TRIG_PIN, OUTPUT); // mengatur pin triger menjadi output
  pinMode(ECHO_PIN, INPUT);  // mengatur pin echo menjadi input
  servo.attach(SERVO_PIN);   // menempelkan servo pada pin 9 ke objek servo
  servo.write(0);
}

void loop() {
  // menghasilkan pulsa 10 mikrodetik ke pin TRIG
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // mengukur durasi pulsa dari pin ECHO
  duration_us = pulseIn(ECHO_PIN, HIGH);
  // calculate the distance
  distance_cm = 0.017 * duration_us;

  if (distance_cm < DISTANCE_THRESHOLD)
    servo.write(0); // memutar servo ke 90 derajat
  else
    servo.write(90);  // memutar servo ke 0 deraja

  // menampilkn nilainya ke Serial Monitor
  Serial.print("distance: ");
  Serial.print(distance_cm);
  Serial.println(" cm");

  delay(500);

  if(WiFi.status()== WL_CONNECTED)
  {
    HTTPClient http;
    String serverPath = serverName + String(distance_cm);
    http.begin(serverPath);
    int httpResponseCode = http.GET();
    if (httpResponseCode>0)
    {
      Serial.print("HTTP Response code: ");
      Serial.println(httpResponseCode);
      String payload = http.getString();
      Serial.println(payload);
    }
    else
    {
      Serial.print("Error code: ");
      Serial.println(httpResponseCode);
    }
    http.end();
  }
  else
  {
    Serial.println("WiFi Disconnected");
  }

}