/*
Arduino Uno 驱动HC-SR04 超声波测距传感器模块
Created
by 太极创客
http://www.taichi-
使用Arduino Uno驱动HC-SR04超声波测距传感器模块
程序运行后，传感器将感应到的距离信息通过Arduino IDE的串口监视器显示。
接线方法:
HC-SR04 引脚 VCC 连接到 Arduino 引脚 +5VDC
HC-SR04 引脚 Trig 连接到 Arduino 引脚 11
HC-SR04 引脚 Echo 连接到 Arduino 引脚 12
HC-SR04 引脚 GND 连接到 Arduino 引脚 GND
获得HC-SR04 超声波测距传感器模块和Arduino的更多信息
请参阅太极创客网站：http://www.taichi-
This example code is in the public domain.
*/
int trigPin = 11; //Trig
int echoPin = 12; //Echo
long duration, cm, inches;
void setup() {
//Serial Port begin
Serial.begin (9600);
//Define inputs and outputs
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
}
void loop()
{
// The sensor is triggered by a HIGH pulse of 10 or more microseconds.
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
digitalWrite(trigPin, LOW);
delayMicroseconds(5);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
// Read the signal from the sensor: a HIGH pulse whose
// duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
duration = pulseIn(echoPin, HIGH);
// convert the time into a distance
cm = (duration/2) / 29.1;
inches = (duration/2) / 74;
Serial.print(inches);
Serial.print("in, ");
Serial.print(cm);
Serial.print("cm");
Serial.println();
delay(1000);
}
