const int trigPin = 25; // Trigger Pin of Ultrasonic Sensor const int echoPin = 28; // Echo Pin of Ultrasonic Sensor void setup() { pinMode(trigPin, OUTPUT); pinMode(echoPin, INPUT); Serial.begin(9600); // Starting Serial Terminal } void loop() { long duration, inches, cm; digitalWrite(trigPin, LOW);//clears the trigger pin condition delayMicroseconds(2); digitalWrite(trigPin, HIGH); //sets the trigger pin HIGH (ACTIVE) for 10 us delayMicroseconds(10); digitalWrite(trigPin, LOW); //read the echoPin,return the sound wave travel time in us duration = pulseIn(echoPin, HIGH); // us to cm cm = microsecondsToCentimeters(duration); Serial.print(cm); Serial.print("cm"); Serial.println(); delay(100); } long microsecondsToCentimeters(long microseconds) { //speed of sound wave divided by 2 (go and back) return microseconds * 0.034 / 2; } 把距离打包成可调取的子函数

您可以将距离计算封装为一个可调用的子函数。以下是一种实现方式：

const int trigPin = 25; // 触发引脚
const int echoPin = 28; // 回声引脚

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(9600); // 启动串口终端
}

void loop() {
  long duration, inches, cm;
  cm = getDistance(); // 调用子函数获取距离
  Serial.print(cm);
  Serial.print("cm");
  Serial.println();
  delay(100);
}

long getDistance() {
  digitalWrite(trigPin, LOW); // 清除触发引脚状态
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  long duration = pulseIn(echoPin, HIGH); // 读取回声引脚，返回声波行程时间（单位：微秒）
  return microsecondsToCentimeters(duration); // 转换为厘米并返回距离值
}

long microsecondsToCentimeters(long microseconds) {
  return microseconds * 0.034 / 2; // 声速的一半（来回）
}

通过将距离计算封装为 `getDistance()` 子函数，您可以在 `loop()` 循环中直接调用它来获取距离，并且代码更加模块化和可读性更强。