Look at the Nintendo Wii's controller. It uses an infrared LED in the controller and for a base station has two cheap IR cameras a certain distance apart. Position is read off the cameras and distance is measured using triangulation. This method seems to give pretty accurate absolute positioning for a very cheap price point. Cheers, Zik On 01/06/06, Randy Boulter wrote: > > > 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 > -- > 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