Processing Forum

Drawing complex 3-D shapes in processing.

[2 Replies]
- 01-Oct-2012 11:17 PM
- Forum: General Discussion
How can i draw complex shapes, for example an airplane or a teapot etc etc? I tried searching through the references, and the best option i was able to find was using the beginshape and endshape and then specifying the coordinates of the vertices. Is it possible to draw the object like in autoCAD or solidworks, then transform them to the corresponding processing code? Geometrically visualising and finding out each and every vertices looks very confusing and hard.

Parsing values from Arduino to processing.

[7 Replies]
- 15-Sep-2012 12:42 AM
- Forum: Integration and Hardware
I'm trying to parse my values which i get from my 6 DOF inertial measurement unit , from arduino to processing. So far, following results have been accomplished.
1. Sent the float values as string to processing. Converted them back to float in processing and displayed.

Problem : When i tilt my IMU, the values changes accordingly, but these changes are not affected in processing, but it is successfully affected in arduino serial monitor. There is only slight variation in processing, say from 5.8 to 6.2 when i do a 90 degree tilt, whereas the actual should have been like about 5.8 to 70.4 or something.

This is the code fragment from arduino.
2. mpu.dmpGetQuaternion(&q, fifoBuffer);
3. mpu.dmpGetEuler(euler, &q);
4. Serial.println(euler[0] * 180/M_PI);
5. Serial.println(euler[1] * 180/M_PI);
6. Serial.println(euler[2] * 180/M_PI);
And this is my Processing sketch.
2. import processing.serial.*;
3. import processing.opengl.*;
4. Serial myPort;
5. float[] value=new float[4];
6. int i=0;
7. int k=100;
8. String[] msg=new String[5];
12. void setup()
13. {
14. size(600,600,OPENGL);
15. noStroke();
16. String portName="COM4";
17. myPort = new Serial(this, portName, 115200);
18. frameRate(50);
19. background(255);
20. fill(246, 225, 65);
21. lights();
22. }
24. void draw()
25. {
26. if(i>2)
27. i=0;
28. msg[i] = myPort.readStringUntil(13);
29. if(msg[i] != null)
30. {
31. value[i] = float(msg[i]);
32. println(value);
33. }
34. ++i;
37. background(255);
41. translate(width/2,0);
43. fill(0);
44. text("Yaw: " + ((float) value[0]), 0, k);
45. text("Pitch: " + ((float) value[1]), 100, k);
46. text("Roll: " + ((float) value[2]), 200, k);
48. }

Simulating the MPU-6050 Inertial measurement unit.

[0 Replies]
- 10-Sep-2012 09:51 AM
- Forum: Integration and Hardware
I'm trying to simulate or mimick the movements of my IMU, mpu-6050 to a cube in processing. I have used Jeff Rowberg's code to get the Euler angles from the digital motion processor of the IMU, and i was able to successfully send them to the processing IDE through my arduino duemilanove. But the cube violently jitters all over the screen, although i have not given any code for changing the coordinates. Any idea why? I want it to be stationary at a coordinate and roatate in the x,y,z directions depending upon the values from my IMU. I've basically used the rotateX,rotateY, rotateZ functions to rotate the cube. Here are my arduino and processing sketchs.
2. #include "Wire.h"
3. #include "I2Cdev.h"
4. #include "MPU6050_6Axis_MotionApps20.h"
6. MPU6050 mpu;
8. #define OUTPUT_READABLE_EULER
10. bool dmpReady =false;
11. uint8_t mpuIntStatus; // holds actual interrupt status byte from MPU
12. uint8_t devStatus; // return status after each device operation (0 = success, !0 = error)
13. uint16_t packetSize; // expected DMP packet size (default is 42 bytes)
14. uint16_t fifoCount; // count of all bytes currently in FIFO
15. uint8_t fifoBuffer[64]; // FIFO storage buffer
17. float euler[3];
18. Quaternion q;
20. volatile bool mpuInterrupt = false;
21. void dmpDataReady()
22. {
23. mpuInterrupt=true;
24. }
27. void setup()
28. {
29. Wire.begin();
30. Serial.begin(9600);
31. mpu.initialize();
32. while(Serial.available() && Serial.read());
33. devStatus= mpu.dmpInitialize();
35. if(devStatus == 0)
36. {
37. mpu.setDMPEnabled(true);
38. attachInterrupt(0,dmpDataReady,RISING);
39. mpuIntStatus= mpu.getIntStatus();
40. dmpReady=true;
41. packetSize=mpu.dmpGetFIFOPacketSize();
42. }
43. else
44. {
45. Serial.print(F("dmp initialization failed"));
46. }
47. }
50. void loop()
51. {
53. if(!dmpReady)
54. return;
55. mpuInterrupt = false;
56. mpuIntStatus = mpu.getIntStatus();
57. fifoCount = mpu.getFIFOCount();
59. if ((mpuIntStatus & 0x10) || fifoCount == 1024)
60. {
61. mpu.resetFIFO();
62. Serial.println(F("FIFO overflow!"));
64. }
65. else if (mpuIntStatus & 0x02)
66. {
67. while (fifoCount < packetSize) fifoCount = mpu.getFIFOCount();
68. mpu.getFIFOBytes(fifoBuffer, packetSize);
70. // track FIFO count here in case there is > 1 packet available
71. // (this lets us immediately read more without waiting for an interrupt)
72. fifoCount -= packetSize;
74. // #ifdef OUTPUT_READABLE_EULER
75. // display Euler angles in degrees
76. mpu.dmpGetQuaternion(&q, fifoBuffer);
77. mpu.dmpGetEuler(euler, &q);
78. /* Serial.print("euler\t");
79. Serial.print(euler[0] * 180/M_PI);
80. Serial.print("\t");
81. Serial.print(euler[1] * 180/M_PI);
82. Serial.print("\t");
83. Serial.println(euler[2] * 180/M_PI);
84. #endif*/
85. for(int i=0;i<4;i++)
86. {
87. Serial.println(euler[i],4);
88. delay(10);
89. }
90. }
92. }
processing sketch.
2. import processing.serial.*;
3. import processing.opengl.*;
4. Serial myPort;
5. float[] value=new float[4];
7. String[] msg=new String[5];
8. float x, y,z;
9. void setup()
10. {
11. size(600,600,OPENGL);
12. noStroke();
13. String portName="COM4";
14. myPort = new Serial(this, portName, 9600);
16. }
18. void draw()
19. {
20. serialEvent();
22. rotateX(value[0]);
23. rotateY(value[1]);
24. rotateZ(value[2]);
27. background(255);
28. fill(246, 225, 65);
29. lights();
30. translate(200,200);
31. box(50);
32. }
34. void serialEvent()
35. {
36. // get msg till line break (ASCII > 13)
38. for(int i=0;i<4;i++)
39. {
40. msg[i] = myPort.readStringUntil(13);
41. if(msg[i] != null)
42. {
43. value[i] = float(msg[i]);
44. println(value);
45. }
47. }
48. }
Thanks.

Sending data from arduino to processing, serially.

[5 Replies]
- 09-Sep-2012 02:50 AM
- Forum: Integration and Hardware
I have an arduino duemilanove. I'm trying to send an array of positive and negative floating point numbers, stored within the arduino, to processing.
I was going one step at a time by sending a single byte by using the following code and it worked perfectly.
1. void setup()
  {
  Serial.begin(9600);
  }
  byte a=43;
  void loop()
  {
  Serial.write(a);
  }
//processing sketch
1. import processing.serial.*;
  
  Serial myPort;
  void setup()
  {
  String portName = "COM4";
  
  myPort = new Serial(this, portName, 9600);
  }
  void draw()
  {
  if(myPort.available()>0)
  {
  println(myPort.read());
  delay(1000);
  }
  else
  {
  println("no devices found");
  }
  }
But, by using "byte" datatype i can send only values between 0-255. How can i modify the above programs so that i can send and receive negative and positive floating point numbers.

Thanks.

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