Hey, so the folks over at Spark Fun Electronics dissected the Nike+ sensor –
There is no MEMs accelerometer! The foot pod was designed to activate a simple piezoelectric sensor to monitor how long your weight is on the foot (the faster you run, the shorter amount of time spent on one foot).
This is interesting, especially in light of the treadmill data from the other day… need to think now..
Oh, and thanks to Mark for the link
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