Processing Electronic Compass calibration (take MPU9250 as an example)

Using the processing software, through the Arduino input electronic compass data, through the PC side calibration, the program is as follows:

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 (+, p3d);  MyPort = new Serial (This, "COM5", 38400);  Myport.bufferuntil (10);} void Draw () {   background (+);   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); }   }}

　　

The Arduino code is as follows:

   int mx,my,mz;   :::  slightly    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-side access to the effects such as:

The final coordinate system completely falls inside the ball to indicate a successful calibration.

Video:

Processing Electronic Compass calibration (take MPU9250 as an example)