I had to laugh when I first read your post Nadine because I went bike riding this evening and kept at a pretty good pace, so my first thought was that my rapid heart beat could have provided the mechanical energy for a heart monitor but then I realized you meant the vibration caused by the impact/motion of the runner's feet going up and down with impact.
This is a perfect application for energy harvesting. With it, the vehicle uses no onboard energy source to power the TPM system, other than the tires themselves. Another great energy harvesting story, Liz.
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