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Circuit Walker Sneakers pt. 1: Accelerometer Filtering w/ Tony D!

1,819 views · Published 8 July 2017 · 1:23:55 · Indexed 20 October 2026

Channel: Adafruit Industries · 2017 · Science & Technology

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Live stream to http://twitch.tv/adafruit showing part 1 in a series to build step-reactive light-up Circuit Walker Sneakers with Circuit Playground.  Using the accelerometer and NeoPixels built into Circuit Playground classic and express you can build sneakers that light up with each step.  This first video looks at the step detection algorithm and how to apply filtering to accelerometer values for basic step detection.

Links mentioned in the video:
- Original firewalker sneakers project: https://learn.adafruit.com/firewalker-led-sneakers/overview
- Updated/simplified firewalker sneakers with vibration sensor: https://learn.adafruit.com/gemma-led-sneakers/overview
- Adaptive step detection algorithm paper: https://github.com/danielmurray/adaptiv
- Circuit Walker filtering python notebook: https://github.com/adafruit/Circuit_Walker_Sneakers/blob/master/Circuit%20Walker%20Sneakers%20Filtering.ipynb
- SciPy lfilter and butter function: https://docs.scipy.org/doc/scipy-0.19.0/reference/generated/scipy.signal.lfilter.html#scipy.signal.lfilter and https://docs.scipy.org/doc/scipy-0.19.0/reference/generated/scipy.signal.butter.html#scipy.signal.butter
- Circuit Walker Sneakers code (example sketches shown in this video, and Jupyter notebook for filter generation): https://github.com/adafruit/Circuit_Walker_Sneakers/

Acknowledgements:
- Music: bartlebeats
- Intro shuttle footage: NASA
- Intro fonts: Typodermic
- Intro inspiration: Mr. Wizards's World
- Matrix background: cool-retro-term & cmatrix

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