Syncing the Two Raspberry Pis

Our final design will involve a Raspberry Pi on each foot collecting data and sending it to a central computer for step detection analysis. A crucial component of this system is synchronizing the Raspberry Pis so as the we know the temporal state of the data from the left and right foot. Having unsynchronized data can greatly affect the perceived asymmetry and general gait detected from the data.

To synchronize the Raspberry Pis we sent signals via network packets to a laptop. The signals were timestamped by the computer when received so as the two sets of data were synced with the computers local clock. The signals from the respective Raspberry Pis were now timestamped and prepped for step detection.