Processing 电子罗盘校准(以 MPU9250为例)

　　使用Processing 软件, 通过 arduino 输入 电子罗盘的数据,通过PC端进行校准,程序如下:

import processing.serial.*;

Serial myPort;
ArrayList<Float> xList = new ArrayList<Float>();
ArrayList<Float> yList = new ArrayList<Float>();
ArrayList<Float> zList = new ArrayList<Float>();

float minX,maxX;
float minY,maxY;
float minZ,maxZ;
float moX,moY;
float count;

void setup() {
  size(600, 600, P3D);
  myPort = new Serial(this,"COM5", 38400);
  myPort.bufferUntil(10);
}

void draw() {
  background(100);
  float midX = (minX+maxX)/2;
  float midY = (minY+maxY)/2;
  float midZ = (minZ+maxZ)/2;
  if (mousePressed) {
    moX= mouseX;
    moY= mouseY;
  }

  //camera(moX,moY, (height/2) / tan(PI/5), midX, midY,midZ, 0, 1, 0);
  camera(moX,moY,(height/2) / tan(PI/5), width/2, height/2,0, 0, 1, 0);
  translate(width/2, height/2, -100);
  strokeWeight(2);  // Default
  stroke(255);
  noFill();

　　//x
　　line(midX-100,midY,midZ,midX+100,midY,midZ);
　　//y
　　line(midX,midY+100,midZ,midX,midY-100,midZ);
　　//z
　　line(midX,midY,midZ-100,midX,midY,midZ+100);

  //box(200);

  for(int i = 0;i<xList.size();i++){
    point(xList.get(i),yList.get(i),zList.get(i));
  }
  println(count);
  println("midX:"+midX+","+"midY"+midY+","+"midZ:"+midZ);

}

void serialEvent (Serial myPort)
{

  float mX = 0;
  float mY = 0;
  float mZ = 0;
  String inString = myPort.readStringUntil(10);

  if (inString != null)
  {
   inString = trim(inString);
   String[] list = split(inString, ‘,‘);
   if(list.length ==4){
     count = float(list[0]);
     mX  = float(list[1])/100;
     mY  = float(list[2])/100;
     mZ  = float(list[3])/100;

     //-------------------------
     if(mX < minX){
       minX = mX;
     }

     if(mX > maxX){
       maxX = mX;
     }

     //----------------------------
     if(mY < minY){
       minY = mY;
     }

     if(mY > maxY){
       maxY = mY;
     }
     //----------------------------
     if(mZ > maxZ){
       maxZ = mZ;
     }
     if(mZ < minZ){
       minZ = mZ;
     }

     xList.add(mX);
     yList.add(mY);
     zList.add(mZ);
   } 

  }
}

arduino 代码如下:

   int mx,my,mz;
   :
   :
   :  略

    Serial.print(count);
    Serial.print(",");
    Serial.print(mx);  //Inclination X axis (as measured by accelerometer)
    Serial.print(",");
    Serial.print(my);  //Inclination X axis (estimated / filtered)
    Serial.print(",");
    Serial.print(mz);  //Inclination X axis (estimated / filtered)

    Serial.println("");
    count++;

PC端获取的效果如下图:

最终坐标系完全落入球内表示校准成功.

视频: