Arduino项目开发 Sensors_Ping_Ping.pdf

/* Ping))) Sensor

This sketch reads a PING))) ultrasonic rangefinder and returns the

distance to the closest object in range. To do this, it sends a pulse

to the sensor to initiate a reading, then listens for a pulse

to return. The length of the returning pulse is proportional to

the distance of the object from the sensor.

The circuit:

* +V connection of the PING))) attached to +5V

* GND connection of the PING))) attached to ground

This example code is in the public domain.

*/

// this constant won't change. It's the pin number

// of the sensor's output:

const int pingPin = 7;

void setup() {

// initialize serial communication:

Serial.begin(9600);

}

void loop() {

digitalWrite(pingPin, LOW);