#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <ThingSpeak.h>

// Konfigurasi WiFi
const char* ssid = "Wokwi-GUEST"; 
const char* password = ""; 

// Konfigurasi ThingSpeak
unsigned long myChannelNumber = 2561777 ; 
const char* myWriteAPIKey = " BMFOBKZI71YUAIAK"; 
const char* server= "api.thingspeak.com";
WiFiClient client;

LiquidCrystal_I2C lcd(0x27, 16, 2);
const int metalSensor = 34;
const int ledGreen = 32;
const int ledRed = 33;
const int buzzer = 25;

void setup() {
  Wire.begin(23, 22);
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  pinMode(metalSensor, INPUT);
  pinMode(ledGreen, OUTPUT);
  pinMode(ledRed, OUTPUT);
  pinMode(buzzer, OUTPUT);
  lcd.setCursor(0, 0);
  lcd.print("METAL DETECTOR");
  delay(2000);
  lcd.clear();

  // Menghubungkan ke WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");

  // Menghubungkan ke ThingSpeak
  ThingSpeak.begin(client);
}

void loop() {
  int metalLevel = map(analogRead(metalSensor), 0, 4095, 0, 1000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("METAL: ");
  lcd.print(metalLevel < 500 ? "NO" : "YES");
  lcd.setCursor(0, 1);
  lcd.print("READING: ");
  lcd.print(metalLevel);

  if (metalLevel < 500) {
    digitalWrite(ledGreen, HIGH);
    digitalWrite(ledRed, LOW);
    noTone(buzzer);
  } else {
    digitalWrite(ledGreen, LOW);
    digitalWrite(ledRed, HIGH);
    tone(buzzer, 450);
  }

  // Mengirim data ke ThingSpeak
  ThingSpeak.writeField(myChannelNumber, 1, metalLevel, myWriteAPIKey);

  delay(500);
}