#define BLYNK_TEMPLATE_ID "TMPL3asMKl_-h"
#define BLYNK_TEMPLATE_NAME "NODEMCU"
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <NewPing.h>

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

// Your Blynk authentication token
char auth[] = "TL13ovYDvJkX4fLOSSsnlhVY7wpQxOae";

// Define the GPIO pins for the ultrasonic sensor
#define trigPin 2
#define echoPin 4

// Create an instance of the NewPing library
NewPing sonar(trigPin, echoPin);

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

  Blynk.begin(auth, ssid, pass);

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  Blynk.run();

  // Trigger an ultrasonic pulse
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Measure the distance
  unsigned int distance_cm = sonar.ping_cm();
  distance_cm = (distance_cm*10);

  // Send the distance data to Blynk
  Blynk.virtualWrite(V1, distance_cm);  // Use V1 as a display widget in your Blynk app
  
  Serial.print("Stem Displacement: ");
  Serial.print(distance_cm);
  Serial.println(" mm");

  delay(1000); // Delay between measurements
}