fornulario 3er periodo

                                                                          

 

*/

int inches = 0;

int cm = 0;

long readUltrasonicDistance(int triggerPin, int echoPin)

{

  pinMode(triggerPin, OUTPUT);  // Clear the trigger

  digitalWrite(triggerPin, LOW);

  delayMicroseconds(2);

  // Sets the trigger pin to HIGH state for 10 microseconds

  digitalWrite(triggerPin, HIGH);

  delayMicroseconds(10);

  digitalWrite(triggerPin, LOW);

  pinMode(echoPin, INPUT);

  // Reads the echo pin, and returns the sound wave travel time in microseconds

  return pulseIn(echoPin, HIGH);

}

void setu

{

  Serial.begin(9600);

}

void loop()

{

  // measure the ping time in cm

  cm = 0.01723 * readUltrasonicDistance(7, 7);

  // convert to inches by dividing by 2.54

  inches = (cm / 2.54);

  Serial.print(inches);

  Serial.print("in, ");

  Serial.print(cm);

  Serial.println("cm");

  delay(100); // Wait for 100 millisecond(s)

}