#define BLYNK_TEMPLATE_ID "TMPL64ftw-bBX"
#define BLYNK_TEMPLATE_NAME "Project ChemTex"
#define BLYNK_AUTH_TOKEN "l_oPs5mLHjAOQrI98W305gbvw-BIPA9W"// CHANGE 3 FIRST LAYER FOLLOW BLYNK CODE
#define BLYNK_PRINT Serial

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int metalsensor_PIN = 34;
int led_green = 32;
int led_red = 33;
int buzzer_Pin = 25;
int buzzer_channel = 0;
BlynkTimer timer;

void setup() {
  Wire.begin(23, 22);
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();

  pinMode(metalsensor_PIN, INPUT);
  pinMode(led_green, OUTPUT);
  pinMode(led_red, OUTPUT);
  pinMode(buzzer_Pin, OUTPUT);
  ledcAttachPin(buzzer_Pin, buzzer_channel);

  lcd.setCursor(1,0);
  lcd.print("METAL DETECTOR");
  lcd.setCursor(5,1);
  lcd.print("SENSOR");
  
  delay(5000);
  lcd.clear();

  Blynk.begin(auth, ssid, pass);
  timer.setInterval(500, sendSensor);
}

void sendSensor() {
  float metalLevel = map(analogRead(metalsensor_PIN), 0, 4095, 0, 1000);
  Blynk.virtualWrite(V0, metalLevel);// CHANGE V0 IF NECESSARY- IKUT BLYNK PUNYA
 
  String metalMsg;

  if (metalLevel < 500) {
    metalMsg = "NO";
  } else {
    metalMsg = "YES";
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("METAL: ");
  lcd.print(metalMsg);
  lcd.setCursor(0, 1);
  lcd.print("READING: ");
  lcd.print(metalLevel);

  Serial.print("READING: ");
  Serial.println(metalLevel);
  
  delayWithMillis(500); 

  if (metalLevel < 500) {
    digitalWrite(led_green, HIGH);
    Blynk.virtualWrite(V1, HIGH);// CHANGE V1 IF NECESSARY- IKUT BLYNK PUNYA
    digitalWrite(led_red, LOW);
    Blynk.virtualWrite(V2, HIGH);// CHANGE V2 IF NECESSARY- IKUT BLYNK PUNYA

  } else {
    digitalWrite(led_green, LOW);
    Blynk.virtualWrite(V1, HIGH);// CHANGE V1 IF NECESSARY- IKUT BLYNK PUNYA
    digitalWrite(led_red, HIGH);
    Blynk.virtualWrite(V2, HIGH);// CHANGE V2 IF NECESSARY- IKUT BLYNK PUNYA
    playBuzzer();
  }  
}

void playBuzzer() {
  ledcWriteNote(buzzer_channel, (note_t)NOTE_D, 8);
  tone(buzzer_Pin, 450);
  delay(10);
  noTone(buzzer_Pin);
  delay(10);
}

void delayWithMillis(unsigned long ms)
{
  unsigned long currentMillis = millis();
  while (millis() - currentMillis < ms)
  {
    // Do nothing, just wait
  }
}

void loop() {
  Blynk.run();
  timer.run();
}