#define BLYNK_TEMPLATE_ID "TMPL34IzShutt"
#define BLYNK_TEMPLATE_NAME "Smart campus waste management system"
#define BLYNK_AUTH_TOKEN "6vTf3UckuByhibTewrKcGHRZzaEsuLip"

/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial
unsigned int value = 0;

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

// Your WiFi credentials.

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

#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>

// Pins
#define TRIG_PIN 4
#define ECHO_PIN 0
#define LED_PIN RX
#define SPEAKER_PIN 17
#define DHT_PIN 15
#define DHT_TYPE DHT22

DHT dht(DHT_PIN, DHT_TYPE);

void sendSensorData() {
  // Ultrasonic sensor
  long duration, distance;
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  duration = pulseIn(ECHO_PIN, HIGH);
  distance = (duration / 2) / 29.1; // Convert to cm

  // DHT sensor
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Send data to Blynk
  Blynk.virtualWrite(V2, distance);
  Blynk.virtualWrite(V0, temperature);
  Blynk.virtualWrite(V3, humidity);

  // Check if bin is full
  if (distance < 10) {
    Blynk.virtualWrite(V1,"Waste bin is full!");
    digitalWrite(LED_PIN, HIGH);
    tone(SPEAKER_PIN,500,1000);
    delay(1000);
  }
  else{
    Blynk.virtualWrite(V1,"Bin has Space.");
    digitalWrite(LED_PIN, LOW);
    tone(SPEAKER_PIN,100,1000);
    delay(1000);
  }
}

BlynkTimer timer;

// This function is called every time the Virtual Pin 0 state changes
BLYNK_WRITE(V4)
{
  Serial.println("Inside Blynk Write");
  if(param.asInt() == 1)
  {
      Serial.println("Blynk Write: Value is 1");
     digitalWrite(LED_PIN, HIGH); 
     Blynk.virtualWrite(V1,"Started Successfully.");
     sendSensorData();
  } 
  else
  {
    Serial.println("Blynk Write: Value is 0");
   digitalWrite(LED_PIN, LOW);
  }
}

// This function is called every time the device is connected to the Blynk.Cloud
BLYNK_CONNECTED()
{
   Blynk.syncVirtual(V4);
   Serial.println("Inside Blynk Connected");
  }

// This function sends Arduino's uptime every second to Virtual Pin 2.
void myTimerEvent()
{
  Blynk.virtualWrite(V4, millis() / 1000);
}

void setup()
{
  pinMode(5, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT);
  pinMode(SPEAKER_PIN, OUTPUT);
  // Begin.
  Serial.begin(115200);
  Serial.println("Serial Prints Starts...");
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  dht.begin();

  // Set a timer to send sensor data every 10 seconds
  timer.setInterval(10000L, sendSensorData);
}

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