Código Ping

Olá turma
Tentem usar este código para calcular a distância com o sensor ultrassônico de 3 pinos (PING)
Este código peguei neste site: click aqui
http://tronixstuff.com/2011/11/28/tutorial-parallax-ping-ultrasonic-sensor/

// Connect Ping))) signal pin to Arduino digital 8

int signal=8;

int distance;

unsigned long pulseduration=0;

void setup()

{

pinMode(signal, OUTPUT);

Serial.begin(9600);

}

void measureDistance()

{

// set pin as output so we can send a pulse

pinMode(signal, OUTPUT);

// set output to LOW

digitalWrite(signal, LOW);

delayMicroseconds(5);

 

// now send the 5uS pulse out to activate Ping)))

digitalWrite(signal, HIGH);

delayMicroseconds(5);

digitalWrite(signal, LOW);

 

// now we need to change the digital pin

// to input to read the incoming pulse

pinMode(signal, INPUT);

 

// finally, measure the length of the incoming pulse

pulseduration=pulseIn(signal, HIGH);

}

void loop()

{

// get the raw measurement data from Ping)))

measureDistance();

 

// divide the pulse length by half

pulseduration=pulseduration/2;

 

// now convert to centimetres. We're metric here people...

distance = int(pulseduration/29);

 

// Display on serial monitor

Serial.print("Distance - ");

Serial.print(distance);

Serial.println(" cm");

delay(500);

}