Human-machine interfaces: using Smart Dust to create less intrusive, less visible interfaces to technology. For example, the Acceleration Sensing Glove (ASG) prototyped to create a "virtual keyboard", or a sensor network that interpret gestures from the face on disabled.
Such uses of Smart Dust require high-resolution sampling and low-latency communication. What will be the power supply for these motes? The ASG paper describes processing such as coordinate transforms, vector normalization, and filters on the signal data coming from accelerometers. Question- how to balance the processing between the sensor network and the receiving machine? Probably depends upon the specific application.
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