#include <WiFi.h> 

WiFiClient client;

const int ledM = 13;
const int ledK = 12;
const int ledH = 14;
const int trig = 2;
const int echo = 15;

String thingSpeakAddress = "api.thingspeak.com";
String writeAPIkey;
String request_string;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  WiFi.disconnect();
  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED){
    delay(300);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  pinMode(echo, INPUT);
  pinMode(trig, OUTPUT);
  pinMode(ledH, OUTPUT);
  pinMode(ledK, OUTPUT);
  pinMode(ledM, OUTPUT);
}

float ultrasonik(){
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  int durasiPantulan = pulseIn(echo, HIGH);
  return durasiPantulan * 0.034 / 2;
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(2000);
  float jarakPer = ultrasonik();
  if(jarakPer>150){
    digitalWrite(ledH, HIGH);
    digitalWrite(ledK, LOW);
  }
  else if(jarakPer<=150 && jarakPer>100){
    digitalWrite(ledK, HIGH);
    digitalWrite(ledH, LOW);
    digitalWrite(ledM, LOW);
  }
  else if(jarakPer<=100){
    digitalWrite(ledM, HIGH);
    digitalWrite(ledK, LOW);
  }
  float jarakSeb = 350 - jarakPer;
  kirimData(jarakSeb);
}

void kirimData(float jarak){
  if(client.connect("api.thingspeak.com", 80)){
    request_string = "/update?"; 
    request_string += "key="; 
    request_string += "TZ4I3HYGXS6KDVU9"; 
    request_string += "&"; 
    request_string += "field1"; 
    request_string += "="; 
    request_string += jarak;

    Serial.println(String("GET ") + request_string + " HTTP/1.1\r\n" +
                 "Host: " + thingSpeakAddress + "\r\n" +
                 "Connection: close\r\n\r\n"); 
                 
    client.print(String("GET ") + request_string + " HTTP/1.1\r\n" +
                 "Host: " + thingSpeakAddress + "\r\n" +
                 "Connection: close\r\n\r\n"); 
    unsigned long timeout = millis();
    while (client.available() == 0) { 
      if (millis() - timeout > 5000) {
        Serial.println(">>> Client Timeout !");
        client.stop();
        return;
      }
    }
    while (client.available()) { 
      String line = client.readStringUntil('\r');
      Serial.print(line);
    }
    Serial.println();
    Serial.println("closing connection");
  }
}