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"); 在您的设计中添加更多LED。将代码改良为有至少三LED应显示与雷达相关的检测到物体的角度。

好的，首先我们需要添加两个LED来实现三LED的显示。假设我们新增的LED引脚分别为led2和led3，代码如下：

const int trig = 11;
const int echo = 10;
const int led = 3;
const int led2 = 4;
const int led3 = 5;

void setup() {
  pinMode(trig, OUTPUT);
  pinMode(led, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, 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){
    int brightness = map(distance, 2, 400, 255, 0);
    analogWrite(led, brightness);
    analogWrite(led2, brightness/2);
    analogWrite(led3, brightness/3);
  }
  else if (distance < 2){
    analogWrite(led, 255);
    analogWrite(led2, 255);
    analogWrite(led3, 255);
  }
  else {
    analogWrite(led, 0);
    analogWrite(led2, 0);
    analogWrite(led3, 0);
  }
  Serial.print(distance);
  Serial.print("cm");
}

这里我们将新增的两个LED的亮度分别设置为原来LED的1/2和1/3，这样就可以实现三个LED根据探测到物体的距离显示不同的亮度。至于如何实现显示与雷达相关的检测到物体的角度，可以参考我之前给出的回答，通过控制舵机的角度来控制LED的位置。