# Ep 231: Harnessing Sparks, Hacking Food, and Leaving Breadcrumbs

- Show: [Hackaday Podcast](https://hardwarepodcasts.com/podcast/hackaday-podcast)
- Published: 2023-08-11
- Length: 52m
- Episode: 231
- Page: https://hardwarepodcasts.com/podcast/hackaday-podcast/2023-08-11-ep-231-harnessing-sparks-hacking-food-and-leaving-breadcrumbs
- Listen: https://hackaday.libsyn.com/ep-231-harnessing-sparks-hacking-food-and-leaving-breadcrumbs

## Summary

Hosts Elliot Williams and Al Williams discuss recent Hackaday posts, including a neural network that eavesdrops on keyboard typing via sound spectrograms and an STM32-based oscilloscope project by J.G. Piero. They explore industrial design techniques for 3D printing, such as shadow lines and crush ribs, and debate the relevance of home PCB etching versus commercial fabrication. The episode also covers Norbert Heinz's electrical discharge machining experiments, a magneto-hydrodynamic drive, and a review of the Beepy, a Raspberry Pi-based device featuring a genuine Blackberry keyboard.

## Chapters

- [0:02](https://hardwarepodcasts.com/podcast/hackaday-podcast/2023-08-11-ep-231-harnessing-sparks-hacking-food-and-leaving-breadcrumbs#t=2) Introduction: Superconductor Skepticism and Sound Game
- [2:30](https://hardwarepodcasts.com/podcast/hackaday-podcast/2023-08-11-ep-231-harnessing-sparks-hacking-food-and-leaving-breadcrumbs#t=150) Keyboard Eavesdropping via Neural Networks and Spectrograms
- [5:43](https://hardwarepodcasts.com/podcast/hackaday-podcast/2023-08-11-ep-231-harnessing-sparks-hacking-food-and-leaving-breadcrumbs#t=343) STM32 Oscilloscope Project and Accessibility of Test Equipment
- [12:43](https://hardwarepodcasts.com/podcast/hackaday-podcast/2023-08-11-ep-231-harnessing-sparks-hacking-food-and-leaving-breadcrumbs#t=763) Industrial Design Techniques: Shadow Lines and Crush Ribs in 3D Printing
- [19:36](https://hardwarepodcasts.com/podcast/hackaday-podcast/2023-08-11-ep-231-harnessing-sparks-hacking-food-and-leaving-breadcrumbs#t=1176) Home PCB Etching vs. Commercial Fabrication
- [26:23](https://hardwarepodcasts.com/podcast/hackaday-podcast/2023-08-11-ep-231-harnessing-sparks-hacking-food-and-leaving-breadcrumbs#t=1583) Electrical Discharge Machining with Spinning Drill Bits
- [31:06](https://hardwarepodcasts.com/podcast/hackaday-podcast/2023-08-11-ep-231-harnessing-sparks-hacking-food-and-leaving-breadcrumbs#t=1866) Magneto-Hydrodynamic Drive and Quick Hacks
- [38:29](https://hardwarepodcasts.com/podcast/hackaday-podcast/2023-08-11-ep-231-harnessing-sparks-hacking-food-and-leaving-breadcrumbs#t=2309) Beepy Review: Blackberry Keyboard and Raspberry Pi Integration
- [44:42](https://hardwarepodcasts.com/podcast/hackaday-podcast/2023-08-11-ep-231-harnessing-sparks-hacking-food-and-leaving-breadcrumbs#t=2682) Documentation Strategies: Leaving Breadcrumbs and Project Sharing

## Topics

- [Embedded firmware](https://hardwarepodcasts.com/topic/embedded-firmware)
- [PCB design & layout](https://hardwarepodcasts.com/topic/pcb-design)
- [Industrial & consumer product design](https://hardwarepodcasts.com/topic/industrial-design)
- [Prototyping & iteration](https://hardwarepodcasts.com/topic/prototyping)
- [Analog & power electronics](https://hardwarepodcasts.com/topic/analog-and-power-electronics)
- [Careers & education](https://hardwarepodcasts.com/topic/engineering-careers-and-education)

## Most relevant to

makers and hobbyists

## Mentioned

- LK 99 (other)
- STM32 (chip)
- RP2040 (chip)
- Raspberry Pi (chip)
- Blackberry (company)
- Beepy (product)
- Norbert Heinz (other)
- Jay Bowles (other)
- Arya Voronova (other)
- Tom Nardi (other)
- J.G. Piero (other)
- Joshua Harrison (other)
- Asan (other)
- Toriani (other)
- Maryam Memijad (other)
- Teaching Tech (other)
- Sebastian (other)
- Dan Maloney (other)
- Isler (company)
- Robert Murray Smith (other)
- Fulvio (other)
- Lunduke (other)
- Process X (other)
- Next Period (other)
- NBM 7100 (product)
- Arturo 182 (other)
- SQFMI (company)

## Related episodes from other shows

- [474: The Doublemint Gum Remote Control](https://hardwarepodcasts.com/podcast/making-it/2025-03-07-474-the-doublemint-gum-remote-control) (Making It)
- [351: Dextral or Sinistral](https://hardwarepodcasts.com/podcast/embedded-fm/2020-11-13-351-dextral-or-sinistral) (Embedded.fm)
- [Electromaker of the Month Winners, Maker Music Festival, and more!](https://hardwarepodcasts.com/podcast/the-electromaker-show/2022-03-10-electromaker-of-the-month-winners-maker-music-festival-and-more) (The Electromaker Show)
- [3D Printed Shark Jumps - Edifying Edison's Energy](https://hardwarepodcasts.com/podcast/the-amp-hour/2014-09-24-3d-printed-shark-jumps-edifying-edisons-energy) (The Amp Hour)
- [New 2GB Raspberry Pi Benchmarked, E-Ink Typewriters, ARM SBC Laptops, and much more!](https://hardwarepodcasts.com/podcast/the-electromaker-show/2024-08-24-new-2gb-raspberry-pi-benchmarked-e-ink-typewriters-arm-sbc-laptops-and-much-more) (The Electromaker Show)

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