Arduino 采集雷达模块数据与串口绘图

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Arduino 采集雷达模块数据与串口绘图 [复制链接]

# Arduino 采集雷达模块数据与串口绘图

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当采用串口输出模式时，雷达检测到运动时，则输出 `v=0.0km/h, str=1234` 字样；

`v` 表示目标速度大小，`str` 表示信号强度；

当雷达检测不到目标时，串口停止输出。

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## 项目实现

Arduino 串口采集雷达模块数据，并通过串口打印至接收窗口，绘制 **速度演化曲线** 和 **信号强度演化曲线** 。

### 原始代码

```c++
void setup() 
{
Serial.begin (115200);
while (Serial.read() >= 0){}//clear serialbuffer
}

String comdata = "";

void loop() {
if (Serial.available() > 0) 
{
  char data = Serial.read();
  comdata += data;
  if (data == '\n')
  {
   Serial.println (comdata);
   comdata = "";
  }
}
}
```

### 串口打印

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注意到串口打印出的字符串既包含文字也包含数字，若要实现串口绘图，则需将其中的数字部分提取出来。

### 代码升级

```c++
String comdata = "";
void setup() 
{
Serial.begin (115200);
while (Serial.read() >= 0){}//clear serialbuffer
}

void loop() {
if (Serial.available() > 0) 
{
  char data = Serial.read();
  comdata += data;
  if (data == '\n')
  {
  // 分割字符串
  int separatorIndex = comdata.indexOf(','); // 假设分隔符为逗号
  if (separatorIndex != -1) 
  {
  String part1 = comdata.substring(0, separatorIndex); // 第一个部分
  String part2 = comdata.substring(separatorIndex + 1); // 第二个部分
  // 打印分割后的数据
  Serial.println(part1);
  Serial.println(part2);
  }
  comdata = "";
  }
}
}
```

#### 效果

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### 数字提取

同理，对 `part1` 和 `part2` 进行分离提取索引数字

```c++
String comdata = "";
void setup() 
{
Serial.begin (115200);
while (Serial.read() >= 0){}//clear serialbuffer
}

void loop() {
if (Serial.available() > 0) 
{
  char data = Serial.read();
  comdata += data;
  if (data == '\n')
  {// type of comdata: v=1.0 km/h, str=10151
  int separatorIndex = comdata.indexOf(','); // 假设分隔符为逗号
  if (separatorIndex != -1)
  {
  String part1 = comdata.substring(0, separatorIndex); // 第一个部分
  String part2 = comdata.substring(separatorIndex + 1); // 第二个部分
  // 打印分割后的数据
  //Serial.println(part1); // type of part1: v=1.0 km/h
  //Serial.println(part2); // type of part2:str=10151
  /*------------ part1 : v=1.0 km/h ----------*/
  int part1separatorIndex = part1.indexOf('='); //index of '='
  if (part1separatorIndex != -1)
  {
    String vlc = part1.substring(part1separatorIndex + 1); // index of velocity, type of vlc is 1.0 km/h
    // vlc: 1.0 km/h
    int VLCseparatorIndex = vlc.indexOf(' '); // index of ' '
    String v = vlc.substring(0, VLCseparatorIndex);// v only include number
    float Vn = v.toFloat();
    Serial.print(Vn); // print velocity number
    Serial.print(',');
  }
  /*------------- part2 :str=10151 ------------------*/
  int part2separatorIndex = part2.indexOf('='); //index of '='
  if (part2separatorIndex != -1)
  {
    String strng = part2.substring(part2separatorIndex + 1); // strng only include number
    int Sn = strng.toInt();
    Serial.print(Sn); // print strength number
  }
  Serial.println();
  }
  comdata = "";
  }
}
}
```

#### 流程图

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串口打印数字

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### 串口绘图

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