#define BLYNK_TEMPLATE_ID "TMPL3zRinEfJm"
#define BLYNK_TEMPLATE_NAME "Smart Dustbin"
#define BLYNK_AUTH_TOKEN "yAn71d0BnEEAVHF0t8WC3pEszAHfj_7o"

/* Comment this out to  disable prints and save space */
#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

// Set your WiFi credentials
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// Define ultrasonic sensor pins
#define trigPin 4
#define echoPin 2

// Define thresholds for water levels in percentage and corresponding distances
#define FULL_LEVEL_PERCENTAGE 10
#define EMPTY_LEVEL_PERCENTAGE 80
//#define MOTOR_START_PERCENTAGE 5

// Maximum measurable distance by the ultrasonic sensor in cm

#define MAX_DISTANCE 400

// Initialize Blynk
BlynkTimer timer;

void setup() {
  Serial.begin(115200);
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  
  // Timer to check water level periodically
  timer.setInterval(10000L, checkWaterLevel); // Check every 10 seconds
}

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

void checkWaterLevel() {
  long duration, distance;
  
  // Clear the trigger pin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  
  // Send a 10 microsecond pulse to trigger pin
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Read the duration of pulse on echo pin
  duration = pulseIn(echoPin, HIGH);
  
  // Calculate distance in cm
  distance = duration * 0.034 / 2;
  
  // Calculate thresholds in cm
  int emptyLevelDistance = MAX_DISTANCE * EMPTY_LEVEL_PERCENTAGE / 100;
  int fullLevelDistance = MAX_DISTANCE * FULL_LEVEL_PERCENTAGE / 100;
 // int motorStartDistance = MAX_DISTANCE * MOTOR_START_PERCENTAGE / 100;
  
  // Debug output
  //Serial.print("Distance: ");
  //Serial.println(distance);
  
  // Check water level and send appropriate message
  if (distance >= emptyLevelDistance) {
    Serial.println("Water Level --> Going to Empty");
    Blynk.virtualWrite(V0, "Water Level --> Going to Empty");
    Serial.println("Please --> Turn On the Motor");
    Blynk.virtualWrite(V0, "Please --> Turn On the Motor");
  } else if (distance < fullLevelDistance) {
    Serial.println("Water Tank Full");
    Blynk.virtualWrite(V0, "Water Tank Full");
    }
}