参考自 Github 项目 ArduinoRadar 。原项目中 Processing 部分代码测试有疏漏，已修改并完成验证。
主要是通过超声波传感器测量目标距离，并借助舵机完成扫描巡视动作，最后通过 Processing 收集测量数据，并完成类似声纳显示器的图形绘制。

项目实物图如下：

radar实物图

Processing 绘制的类似监视器界面的动态图形如下：

radar

一、准备材料

软件：

• Arduino IDE：编写 C 语言源代码并编译上传至 Ardunio 开发板。
• Processing：通过串口与 Arduino 开发板通信，获取实时数据并绘制类似监视器画面的动态图形。

硬件：

• Arduino Uno 或与之兼容的开发版：控制中心。
• 超声波传感器：测量目标距离。
• 舵机：承载超声波传感器，完成扫描动作。

二、连线示意图

线路连接示意图如下：

radar 线路连接

三、源代码

arduino C 程序源代码 radar.ino：

#include <Servo.h>. 

const int trigPin = 7;
const int echoPin = 8;

long duration;
int distance;
Servo myServo; 

void setup() {
  
  pinMode(trigPin, OUTPUT); 
  pinMode(echoPin, INPUT); 
  Serial.begin(9600);
  myServo.attach(9); 
}

void loop() {
  
  for(int i=15;i<=165;i++){  
  myServo.write(i);
  delay(30);
  distance = calculateDistance();
  
  Serial.print(i); 
  Serial.print(","); 
  Serial.print(distance); 
  Serial.print("."); 
  }
  
  for(int i=165;i>15;i--){  
  myServo.write(i);
  delay(30);
  
  distance = calculateDistance();
  
  Serial.print(i);
  Serial.print(",");
  Serial.print(distance);
  Serial.print(".");
  }
}

int calculateDistance() { 
  
  digitalWrite(trigPin, LOW); 
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH); 
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH); 
  distance= duration*0.034/2;
  return distance;
}

Processing 源代码 radar.pde：

import processing.serial.*; // imports library for serial communication
import java.awt.event.KeyEvent; // imports library for reading the data from the serial port
import java.io.IOException;


String Port = "COM3"; //Arduino port
Serial myPort; 


String angle="";
String distance="";
String data="";
String noObject;
float pixsDistance;
int iAngle, iDistance;
int index1=0;
int index2=0;
PFont orcFont;


void setup() {
  
 size (1250, 650); //resolution
 smooth();
 myPort = new Serial(this, Port, 9600);
 myPort.bufferUntil('.');
}
void draw() {
  
  fill(98,245,31);
  noStroke();
  fill(0,4);
  rect(0, 0, width, height-height*0.065);
  
  fill(98,245,31);
  
  drawRadar(); 
  drawLine();
  drawObject();
  drawText();
}


void serialEvent (Serial myPort) {
  
  data = myPort.readStringUntil('.');
  data = data.substring(0,data.length()-1);
  
  index1 = data.indexOf(",");
  angle= data.substring(0, index1);
  distance= data.substring(index1+1, data.length());
  
  iAngle = int(angle);
  iDistance = int(distance);
}
void drawRadar() {
  
  pushMatrix();
  translate(width/2,height-height*0.074);
  noFill();
  strokeWeight(2);
  stroke(98,245,31);
  
  arc(0,0,(width-width*0.0625),(width-width*0.0625),PI,TWO_PI);
  arc(0,0,(width-width*0.27),(width-width*0.27),PI,TWO_PI);
  arc(0,0,(width-width*0.479),(width-width*0.479),PI,TWO_PI);
  arc(0,0,(width-width*0.687),(width-width*0.687),PI,TWO_PI);
  
  line(-width/2,0,width/2,0);
  line(0,0,(-width/2)*cos(radians(30)),(-width/2)*sin(radians(30)));
  line(0,0,(-width/2)*cos(radians(60)),(-width/2)*sin(radians(60)));
  line(0,0,(-width/2)*cos(radians(90)),(-width/2)*sin(radians(90)));
  line(0,0,(-width/2)*cos(radians(120)),(-width/2)*sin(radians(120)));
  line(0,0,(-width/2)*cos(radians(150)),(-width/2)*sin(radians(150)));
  line((-width/2)*cos(radians(30)),0,width/2,0);
  popMatrix();
}


void drawObject() {
  
  pushMatrix();
  translate(width/2,height-height*0.074);
  strokeWeight(9);
  stroke(255,10,10);
  pixsDistance = iDistance*((height-height*0.1666)*0.025);
  
  if(iDistance<40){ //range limit
    
  line(pixsDistance*cos(radians(iAngle)),-pixsDistance*sin(radians(iAngle)),(width-width*0.505)*cos(radians(iAngle)),-(width-width*0.505)*sin(radians(iAngle)));
  }
  popMatrix();
}
void drawLine() {
  pushMatrix();
  strokeWeight(9);
  stroke(30,250,60);
  translate(width/2,height-height*0.074);
  line(0,0,(height-height*0.12)*cos(radians(iAngle)),-(height-height*0.12)*sin(radians(iAngle)));
  popMatrix();
}


void drawText() {
  
  pushMatrix();
  fill(0,0,0);
  noStroke();
  rect(0, height-height*0.0648, width, height);
  fill(98,245,31);
  textSize(15);
  text("10cm",width-width*0.3854,height-height*0.0833);
  text("20cm",width-width*0.281,height-height*0.0833);
  text("30cm",width-width*0.177,height-height*0.0833);
  text("40cm",width-width*0.0729,height-height*0.0833);
  textSize(30);
  text("Angle: " + iAngle +" °", width-width*0.48, height-height*0.0277);
  text("Distance: ", width-width*0.26, height-height*0.0277);
  if(iDistance<40) {
  text("        " + iDistance +" cm", width-width*0.225, height-height*0.0277);
  }
  textSize(25);
  fill(98,245,60);
  translate((width-width*0.4994)+width/2*cos(radians(30)),(height-height*0.0907)-width/2*sin(radians(30)));
  rotate(-radians(-60));
  text("30°",0,0);
  resetMatrix();
  translate((width-width*0.503)+width/2*cos(radians(60)),(height-height*0.0888)-width/2*sin(radians(60)));
  rotate(-radians(-30));
  text("60°",0,0);
  resetMatrix();
  translate((width-width*0.507)+width/2*cos(radians(90)),(height-height*0.0833)-width/2*sin(radians(90)));
  rotate(radians(0));
  text("90°",0,0);
  resetMatrix();
  translate(width-width*0.513+width/2*cos(radians(120)),(height-height*0.07129)-width/2*sin(radians(120)));
  rotate(radians(-30));
  text("120°",0,0);
  resetMatrix();
  translate((width-width*0.5104)+width/2*cos(radians(150)),(height-height*0.0574)-width/2*sin(radians(150)));
  rotate(radians(-60));
  text("150°",0,0);
  popMatrix();
}

注意 radar.pde 文件开头的 String Port = "COM3"; 行代码，将 Port 变量的值 COM3 改为 Ardunio 开发板实际连接的串口号。

四、运行效果

演示视频

radar GIF 动图