/* ESP32 WiFi Scanning example */

#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <NewPing.h>
#include <LiquidCrystal_I2C.h>

// Blynk Auth Token
char auth[] = "";

// Your WiFi credentials
char ssid[] = "one plus nord ce3 lite ";
char pass[] = "gayathri2004";

// Ultrasonic sensor pins and maximum distance
#define TRIGGER_PIN1 5
#define ECHO_PIN1 18
#define TRIGGER_PIN2 4
#define ECHO_PIN2 19
#define TRIGGER_PIN3 17
#define ECHO_PIN3 16
#define MAX_DISTANCE 200 // Maximum distance in centimeters

NewPing sonar1(TRIGGER_PIN1, ECHO_PIN1, MAX_DISTANCE);
NewPing sonar2(TRIGGER_PIN2, ECHO_PIN2, MAX_DISTANCE);
NewPing sonar3(TRIGGER_PIN3, ECHO_PIN3, MAX_DISTANCE);

// LCD setup
LiquidCrystal_I2C lcd(0x27, 16, 2); // Change to your LCD's I2C address

// Buzzer pin
#define BUZZER_PIN 23

void setup() {
  Serial.begin(115200);
  Blynk.begin(auth, ssid, pass);
  lcd.begin(16, 2);
  lcd.init();
  lcd.backlight();
  pinMode(BUZZER_PIN, OUTPUT);
  digitalWrite(BUZZER_PIN, LOW);
}

void loop() {
  Blynk.run();

  int distance1 = sonar1.ping_cm();
  int distance2 = sonar2.ping_cm();
  int distance3 = sonar3.ping_cm();

  // Update LCD with waste levels
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Bin1: ");
  lcd.print(distance1);
  lcd.print("cm");
  lcd.setCursor(0, 1);
  lcd.print("Bin2: ");
  lcd.print(distance2);
  lcd.print("cm");

  // Send distances to Blynk app
  Blynk.virtualWrite(V1, distance1);
  Blynk.virtualWrite(V2, distance2);
  Blynk.virtualWrite(V3, distance3);

  // Check waste levels and activate buzzer if necessary
  if (distance1 < 10 || distance2 < 10 || distance3 < 10) {
    digitalWrite(BUZZER_PIN, HIGH);
    lcd.setCursor(9, 1);
    lcd.print("ALERT!");
  } else {
    digitalWrite(BUZZER_PIN, LOW);
  }

  delay(1000); // Wait for 1 second before next measurement
}