I have been tasked with doing a conceptual design for a device that tracks finger movement using a sensor device mounted to the finger.  Does anyone have experience with this or something similar?  Or thoughts or ideas?  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.

Thanks,

Randy
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