const int trig = 11; const int echo = 10; const int led = 3; void setup() { pinMode(trig, OUTPUT); pinMode(led, OUTPUT); pinMode(echo, INPUT); Serial.begin(9600); } void loop() { digitalWrite(trig, LOW); delayMicroseconds(2); digitalWrite(trig,HIGH); delayMicroseconds(10); digitalWrite(trig, LOW); long duration = pulseIn(echo,HIGH); int distance = duration/58; if (distance >= 2 && distance <=400){ analogWrite(led,map(distance,2,400,255,0)); } else if(distance < 2) { analogWrite(led,255); } else{ analogWrite(led,0); } Serial.print(distance); Serial.print("cm"); delay(100); }在这个代码中添一个舵机固定在15度到165度之间循环转动

好的，你可以将下面的代码加入到原来的代码中，以实现你的要求：

1. 在setup()函数中添加以下代码，用于初始化舵机：

#include <Servo.h>
Servo myservo;
myservo.attach(9);

2. 在loop()函数中，将以下代码添加到Serial.print("cm")之前，以实现舵机循环转动：

int angle = map(distance,2,400,15,165);
myservo.write(angle);
delay(10);

完整代码如下：

#include <Servo.h>
Servo myservo;
const int trig = 11; 
const int echo = 10; 
const int led = 3;  

void setup() {   
  pinMode(trig, OUTPUT);    
  pinMode(led, OUTPUT);    
  pinMode(echo, INPUT);   
  Serial.begin(9600);  
  myservo.attach(9);  
}  

void loop() {   
  digitalWrite(trig, LOW);   
  delayMicroseconds(2);    
  digitalWrite(trig,HIGH);  
  delayMicroseconds(10);    
  digitalWrite(trig, LOW);   
  long duration = pulseIn(echo,HIGH);   
  int distance = duration/58;   
  if (distance >= 2 && distance <=400){     
    analogWrite(led,map(distance,2,400,255,0));   
  }   
  else if(distance < 2)   {     
    analogWrite(led,255);   
  }   
  else{     
    analogWrite(led,0);   
  }      
  int angle = map(distance,2,400,15,165);
  myservo.write(angle);
  delay(10);
  Serial.print(distance);   
  Serial.print("cm");   
  delay(100); 
}

注意：这段代码中使用了舵机库，需要先在Arduino IDE中安装该库。