Yes, I believe drift would be a problem (using accelerometers) over time. I need to stay within 5mm over 15 minutes or so. As for the virtual reality type gloves, do you know what type of sensor technology they use? Randy ----- Original Message ----- From: "Alan B. Pearce" To: "Microcontroller discussion list - Public." Sent: Wednesday, May 31, 2006 12:35 PM Subject: Re: [EE] Methods for tracking finger position > >For now, I only have to worry about one finger - but > >need to track position in 3 dimensions with a resolution > >of about 5mm over an area of 1 cubic meter. Also, > >the device cannot use a reflective method (such as ir > >or ultrasonic). So far, I have investigated using > >accelerometer chips, but these are still fairly expensive > >and I would like a lower-cost alternative. > > I suspect that accelerometers will have long term drift. What sort of long > term accuracy do you need? > > One thought I had was to use one of those sensory gloves that are used for > virtual reality type things. You would need to have the person sitting to > get a reference point, or some other method of reference. > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist