What methods exist to track the position of points relative to each other. Particularly what methods allow the determination of the distance between up to ten points at once. The distance determination needs to be wireless and should be able to work thru someones arm. This all needs to able to be wired up to a raspberry pi two or arduino. The measurements must be able to take place in in a few milliseconds and repeat constantly. The resolution does not have to be very good about 2 millimeters would work. All of the 10 points can be powered by wires attaching it to the micro computer. Everything will be attached to the arm by tape.

I have looked into both magnetic and RFID solutions, but I don't know enough about either to know if they would work.

  • \$\begingroup\$ What does ~0“-6” mean? \$\endgroup\$ – Andy aka Jan 9 '16 at 19:13
  • \$\begingroup\$ @user, welcome to StackExchange. The quality of the answer to your question will, to a large extent, depend on the quality of your question. Read it again and ask yourself how anyone could answer it. Points have no mass, no dimensions and are invisible. They are undetectable. Presumably you mean something else. Tell us the application and where and what the points are. \$\endgroup\$ – Transistor Jan 9 '16 at 19:19
  • \$\begingroup\$ See the answers to electronics.stackexchange.com/questions/33110/… - the magnetic coil approach is often used for precision tablet pens. Or you could do it visually like the Leap Motion. \$\endgroup\$ – pjc50 Jan 9 '16 at 19:33
  • \$\begingroup\$ @Andyaka aka around zero to six inches. \$\endgroup\$ – user Jan 9 '16 at 19:38
  • \$\begingroup\$ @transistor Obviously a idem like a RFID tag or a magnet will have to be on the points. I mean point just how you defined it. \$\endgroup\$ – user Jan 9 '16 at 19:46

2 Cameras are the easiest solution. AFAIK, the Pi includes a camera input. RFID will have too high latency (The time required to read each RFID chip), and its location accuracy will be very dependent on the environment.

If you can provide power to the sensed elements, adding LED to the element and synchronizing them to the main MCU and detectors will make your job much easier, cause you will not have to do outline detection and complex image processing in real time (aka Microsoft's Kinect).

  • \$\begingroup\$ It needs to be self contained. A camera will not work \$\endgroup\$ – user Jan 10 '16 at 8:04
  • \$\begingroup\$ A camera can be contained in an enclosure. That is beyond the scope of electronics. \$\endgroup\$ – Lior Bilia Jan 14 '16 at 12:45

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