#define BLYNK_TEMPLATE_ID "TMPL3g-C2Rb1s"

#define BLYNK_TEMPLATE_NAME "SMART CAMPUS waste management system"

#define BLYNK_AUTH_TOKEN "3yKGFQ8KT-iOA8vI81tKuUwCuykEZlCv"

#define TRIGGER_PIN_1 12 // GPIO pin connected to the trigger pin of the first ultrasonic sensor

#define ECHO_PIN_1 14 // GPIO pin connected to the echo pin of the first ultrasonic sensor

#define TRIGGER_PIN_2 16 // GPIO pin connected to the trigger pin of the second ultrasonic sensor

#define ECHO_PIN_2 17 // GPIO pin connected to the echo pin of the second ultrasonic sensor

#define LED_PIN_1_ON 2 // GPIO pin connected to the first LED ON pin

#define LED_PIN_1_OFF 0 // GPIO pin connected to the first LED OFF pin

#define LED_PIN_2_ON 4 // GPIO pin connected to the second LED ON pin

#define LED_PIN_2_OFF 5 // GPIO pin connected to the second LED OFF pin

#define BUZZER_PIN_1 32 // GPIO pin connected to the first buzzer

#define BUZZER_PIN_2 33 // GPIO pin connected to the second buzzer

#include<Ultrasonic.h>

#include<BlynkSimpleEsp32.h>

Ultrasonic ultrasonic1(TRIGGER_PIN_1, ECHO_PIN_1);

Ultrasonic ultrasonic2(TRIGGER_PIN_2, ECHO_PIN_2);


char ssid[] = "Wokwi-GUEST";

char pass[] = "";

char auth[] = "3yKGFQ8KT-iOA8vI81tKuUwCuykEZlCv";


void setup() {

  Serial.begin(9600); // Initialize serial communication

  pinMode(LED_PIN_1_ON, OUTPUT); // Set LED 1 ON pin as an output

  pinMode(LED_PIN_1_OFF, OUTPUT); // Set LED 1 OFF pin as an output

  pinMode(LED_PIN_2_ON, OUTPUT); // Set LED 2 ON pin as an output

  pinMode(LED_PIN_2_OFF, OUTPUT); // Set LED 2 OFF pin as an output

  pinMode(BUZZER_PIN_1, OUTPUT); // Set buzzer 1 pin as an output

  pinMode(BUZZER_PIN_2, OUTPUT); // Set buzzer 2 pin as an output

  Blynk.begin(auth, ssid, pass);

}


void loop() {

  Blynk.run();

  long distance1 = measureDistance(TRIGGER_PIN_1, ECHO_PIN_1);

  long distance2 = measureDistance(TRIGGER_PIN_2, ECHO_PIN_2);
  long a = 399 - distance1;
  long b = 399 - distance2; // Read distance from the second ultrasonic sensor

  Serial.print("Bin1 fill level: ");

  Serial.print(a);

  Serial.print(" cm | Bin2 fill level: ");

  Serial.print(b);

  Serial.println(" cm");
  
  

  Blynk.virtualWrite(V1, a ); // Send distance 1 to Blynk app

  Blynk.virtualWrite(V2, b); 








  // Control LED 1 and buzzer 1 based on distance from sensor 1

  if (distance1 < 50) {
    Serial.println("Bin1 is full!!. Don't  put waste on it!!");

    digitalWrite(LED_PIN_1_ON, HIGH); // Turn on LED 1

    digitalWrite(LED_PIN_1_OFF, LOW); // Turn off LED 1

    digitalWrite(BUZZER_PIN_1, HIGH);
    tone(BUZZER_PIN_1, 100);

  } else {

    digitalWrite(LED_PIN_1_ON, LOW); // Turn off LED 1

    digitalWrite(LED_PIN_1_OFF, HIGH); // Turn on LED 1

    digitalWrite(BUZZER_PIN_1, LOW); // Turn off buzzer 1

  }


  // Control LED 2 and buzzer 2 based on distance from sensor 2

  if (distance2 < 50) {
    Serial.println("Bin2 is full!!. Don't  put waste on it!!");

    digitalWrite(LED_PIN_2_ON, HIGH); // Turn on LED 2

    digitalWrite(LED_PIN_2_OFF, LOW); // Turn off LED 2

    digitalWrite(BUZZER_PIN_2, HIGH); // Turn on buzzer 2
    tone(BUZZER_PIN_2, 100);
  } else {

    digitalWrite(LED_PIN_2_ON, LOW); // Turn off LED 2

    digitalWrite(LED_PIN_2_OFF, HIGH); // Turn on LED 2

    digitalWrite(BUZZER_PIN_2, LOW); // Turn off buzzer 2

  }

  delay(1000); // Delay for stability

}
long measureDistance(int tp, int ep)

{

  digitalWrite(tp, LOW);

  delay(2);

  digitalWrite(tp, HIGH);

  delay(10);

  digitalWrite(tp, LOW);


  long duration = pulseIn(ep, HIGH);

  long distance = duration * 0.034 / 2 ;

  return distance;


}