《电子DIY》之基于Arduino的超声波测距（HC-SR04）

模块介绍：
超声波模块介绍

程序源码：

int trig=2;
int echo=3;
int echo_us=0;
int temp=0;
int distanceInteger=0;
int distanceFraction=0;
void setup() {
  // put your setup code here, to run once:
  pinMode(trig,OUTPUT);
  pinMode(echo,INPUT);
  Serial.begin(9600);
}

void function(void)
{
  digitalWrite(trig, HIGH);
  delayMicroseconds(20);
  digitalWrite(trig, LOW);
  
  echo_us = pulseIn(echo, HIGH);
  if((echo_us < 60000) && (echo_us > 1))
  {
    temp = (echo_us*1.7)/10;
    distanceInteger = temp/10;
    distanceFraction = temp%10;
    Serial.print("Present distance is: ");
    Serial.print(distanceInteger, DEC);
    Serial.print('.');
    Serial.print(distanceFraction, DEC);
    Serial.println("cm");
  }
}
void loop() {
  // put your main code here, to run repeatedly:
  function();
  delay(1000);
}

实物图：