#define BLYNK_TEMPLATE_ID "TMPL3sGGPF469"
#define BLYNK_TEMPLATE_NAME "ultrasonic"
#define BLYNK_AUTH_TOKEN "S7QK5OSf_tOfHh09Xv7IXvNloIa9QCRt"


#define TRIG_PIN 4  // Connect to Trigger pin of HC-SR04
#define ECHO_PIN 5  // Connect to Echo pin of HC-SR04

void setup() {
  Serial.begin(115200);  // Start the serial communication at 115200 baud rate
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
  // Send a 10us HIGH pulse to the Trigger pin
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // Read the time it takes for the echo to return
  long duration = pulseIn(ECHO_PIN, HIGH);

  // Calculate the distance in cm
  float distance = 400 * 0.034 / 2;

  // Print the distance to the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  delay(500);  // Wait for 500ms before taking another measurement
}