#define BLYNK_TEMPLATE_ID "TMPL3-OTurGjW"
#define BLYNK_TEMPLATE_NAME "Hello LED"
#define BLYNK_AUTH_TOKEN "FqhLnU8piFC5e8uu0wCxMwPeHO5SoIWZ"
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>

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

#define TRIG 5
#define ECHO 18
#define ULTRA V3

int tankHeight = 50;   // Tank height in cm
bool waterAlertSent = false;

// Function prototype
int readWaterLevel();

void setup()
{
  Serial.begin(115200);

  pinMode(TRIG, OUTPUT);
  pinMode(ECHO, INPUT);

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
}

void loop()
{
  Blynk.run();

  int waterLevel = readWaterLevel();

  Blynk.virtualWrite(ULTRA, waterLevel);

  if (waterLevel >= tankHeight && !waterAlertSent)
  {
    Blynk.logEvent("water_high", "High Level of Water");
    waterAlertSent = true;
  }

  if (waterLevel < tankHeight)
  {
    waterAlertSent = false;
  }

  
}

int readWaterLevel()
{
  digitalWrite(TRIG, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG, LOW);

  long duration = pulseIn(ECHO, HIGH, 30000);

  if (duration == 0)
    return 0;   // No echo received

  int distance = duration * 0.034 / 2;
  int waterLevel =distance- tankHeight;
Serial.print("Water Level: ");
  Serial.print(waterLevel);
  Serial.println(" cm");

  delay(1000);
}