practical 7:

 

code:

int trigpin = 7;

int echopin = 8;

void setup() {

  Serial.begin(9600);

  pinMode(trigpin, OUTPUT);

  pinMode(echopin, INPUT);

}

void loop() {

  digitalWrite(trigpin, LOW);

  delayMicroseconds(2);

  digitalWrite(trigpin, HIGH);

  delayMicroseconds(10);

  digitalWrite(trigpin, LOW);

  

  long duration = pulseIn(echopin, HIGH);

  

  float distanceCM = (duration / 2.0) * 0.0343; // Ensure division is float

  Serial.print("Distance: ");

  Serial.print(distanceCM);

  Serial.println(" cm");

  

  delay(500);

}