#define BLYNK_TEMPLATE_ID "YourTemplateID"
#define BLYNK_DEVICE_NAME "YourDeviceName"
#define BLYNK_AUTH_TOKEN "YourAuthToken"

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

char auth[] = "YourAuthToken";  // Replace with your Blynk Auth Token
char ssid[] = "YourSSID";       // Replace with your WiFi SSID
char pass[] = "YourPassword";   // Replace with your WiFi password

const int trigPin = 5;
const int echoPin = 18;
long duration;
int distance;

void setup() {
  Serial.begin(115200);
  Blynk.begin(auth, ssid, pass);

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Optional: Set up LED pins
  pinMode(19, OUTPUT);
  pinMode(21, OUTPUT);
}

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

void measureDistance() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  Serial.print("Distance: ");
  Serial.println(distance);

  Blynk.virtualWrite(V0, distance);  // Send distance to Blynk app

  // Optional: LED indicators
  if (distance < 10) {
    digitalWrite(19, HIGH);  // Bin full
    digitalWrite(21, LOW);
  } else {
    digitalWrite(19, LOW);
    digitalWrite(21, HIGH);  // Bin empty
  }

  delay(2000);
}