#define BLYNK_TEMPLATE_ID "TMPL3g8NOyuBL"
#define BLYNK_TEMPLATE_NAME "WATER MANAGEMENT"
#define BLYNK_AUTH_TOKEN "keuIMDdFF9hQOue1x8ntz3OuNTInBbD0"

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


//Your wifi credentials
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

BlynkTimer timer;

// This function is called every time the Virtual Pin 0 state changes
BLYNK_WRITE(V0)
{
  // Set incoming value from pin V0 to a variable
  int value = param.asInt();

  // Update state
  Blynk.virtualWrite(V1, value);
}

// This function is called every time the device is connected to the Blynk.Cloud
BLYNK_CONNECTED()
{
  // Change Web Link Button message to "Congratulations!"
  Blynk.setProperty(V3, "offImageUrl", "https://static-image.nyc3.cdn.digitaloceanspaces.com/general/fte/congratulations.png");
  Blynk.setProperty(V3, "onImageUrl",  "https://static-image.nyc3.cdn.digitaloceanspaces.com/general/fte/congratulations_pressed.png");
  Blynk.setProperty(V3, "url", "https://docs.blynk.io/en/getting-started/what-do-i-need-to-blynk/how-quickstart-device-was-made");
}

// This function sends Arduino's uptime every second to Virtual Pin 2.
void myTimerEvent()
{
  // You can send any value at any time.
  // Please don't send more that 10 values per second.
  Blynk.virtualWrite(V2, millis() / 1000);
}
#define trigerpin 16
#define echopin 17
#define buzzer 5 
float distance, duration;
void setup() {
  // put your setup code here, to run once:
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
  pinMode(trigerpin, OUTPUT);
  pinMode(echopin, INPUT);
  Serial.begin(115200);
}

void loop(){
  digitalWrite(trigerpin, LOW);
  delay(2);
  digitalWrite(trigerpin, HIGH);
  delay(10);
  digitalWrite(trigerpin, LOW);
  duration=pulseIn(echopin,HIGH);
  distance=duration/2*0.034;
  Serial.print("distance (in cm)=");
  Serial.println(distance);

if (distance<30){
  digitalWrite(buzzer, HIGH);
  delay(1000);
}
else{
  digitalWrite(buzzer,LOW);
  delay(500);
}
}