#define BLYNK_TEMPLATE_ID "TMPL3UH4SyGpC"
#define BLYNK_TEMPLATE_NAME "Smart waste management"
#define BLYNK_AUTH_TOKEN "bPZ3UxDXszeh9_n_UY3-by-EusTM7Rxs"


#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <ESP32Servo.h>
#include <HTTPClient.h>

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

BlynkTimer timer;

#define echoPin 32
#define trigPin 33

Servo servo;
long duration;
int distance; 
int binLevel = 80;
const int threshold = 75; // Threshold for notification

void sendNotification(String message) {
  HTTPClient http;
  String serverPath = "http://blynk-cloud.com/" + String(auth) + "/notify";

  http.begin(serverPath.c_str());
  http.addHeader("Content-Type", "application/json");

  String jsonPayload = "{\"body\":\"" + message + "\"}";
  int httpResponseCode = http.POST(jsonPayload);

  if (httpResponseCode > 0) {
    String response = http.getString();
    Serial.println(httpResponseCode);
    Serial.println(response);
  } else {
    Serial.print("Error on sending POST: ");
    Serial.println(httpResponseCode);
  }

  http.end();
}

void ultrasonic() {
  // Simulate different distances
  distance = 10; // Example: Change this value to simulate different distances
  binLevel = map(distance, 21, 0, 0, 100); // Adjust bin height here

  Blynk.virtualWrite(V0, distance);
  Blynk.virtualWrite(V1, binLevel);

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.print(" cm, Bin Level: ");
  Serial.print(binLevel);
  Serial.println(" %");

  if (binLevel >= threshold) {
    sendNotification("Dustbin is full. Please empty it!");
  }

  // Control the servo based on bin level
  if (binLevel >= threshold) {
    servo.write(90); // Move the servo to 90 degrees
  } else {
    servo.write(0); // Move the servo back to 0 degrees
  }
}

void setup() {
  Serial.begin(9600); // Initialize serial communication
  servo.attach(13);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Blynk.begin(auth, ssid, pass);
  delay(2000);
  timer.setInterval(1000L, ultrasonic);
}

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