# Ep 155: Dual Integrating Spheres, More Magnetic Switches, PlottyBot, Red Hair in Your Wafers

- Show: [Hackaday Podcast](https://hardwarepodcasts.com/podcast/hackaday-podcast)
- Published: 2022-02-11
- Length: 1h 03m
- Episode: 155
- Page: https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-11-ep-155-dual-integrating-spheres-more-magnetic-switches-plottybot-red-hair-in-you
- Listen: https://hackaday.libsyn.com/ep-155-dual-integrating-spheres-more-magnetic-switches-plottybot-red-hair-in-your-wafers

## Summary

Hackaday editors Elliot Williams and Tom Nardi discuss a variety of hardware projects, including a 3D-printed model of the James Webb Space Telescope's mirror actuators by Zachary Tong, which features flexures for fine and coarse adjustment. They also cover PlottyBot, a refined drawbot by Ben that uses a Raspberry Pi and Python for handwriting capture, and two different approaches to magnetic keyboard switches: Riskables' void switch and Famicu's resin-printed design. The episode concludes with a discussion on DIY integrating spheres using barium sulfate for laser calibration and flashlight testing, and a story about an operator's beard hair causing wafer prober failures.

## Chapters

- [0:02](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-11-ep-155-dual-integrating-spheres-more-magnetic-switches-plottybot-red-hair-in-you#t=2) Introduction: Logo Turtle Bot Debugging
- [4:47](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-11-ep-155-dual-integrating-spheres-more-magnetic-switches-plottybot-red-hair-in-you#t=287) What's That Sound: Cry 2001 Voice Scrambler
- [9:03](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-11-ep-155-dual-integrating-spheres-more-magnetic-switches-plottybot-red-hair-in-you#t=543) James Webb Space Telescope Mirror Actuators
- [15:46](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-11-ep-155-dual-integrating-spheres-more-magnetic-switches-plottybot-red-hair-in-you#t=946) Magnetic Keyboard Switches: Riskables and Famicu
- [20:54](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-11-ep-155-dual-integrating-spheres-more-magnetic-switches-plottybot-red-hair-in-you#t=1254) PlottyBot Drawbot and Handwriting Capture
- [35:05](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-11-ep-155-dual-integrating-spheres-more-magnetic-switches-plottybot-red-hair-in-you#t=2105) Dual Integrating Spheres and Barium Sulfate
- [39:24](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-11-ep-155-dual-integrating-spheres-more-magnetic-switches-plottybot-red-hair-in-you#t=2364) Home-Grown Algae Production
- [45:32](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-11-ep-155-dual-integrating-spheres-more-magnetic-switches-plottybot-red-hair-in-you#t=2732) Quick Hacks: PDP-8, Fake Op-Amps, and Ford Maverick
- [50:19](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-11-ep-155-dual-integrating-spheres-more-magnetic-switches-plottybot-red-hair-in-you#t=3019) Camp Miss: Wafer Prober Hair Incident and Crimping Tools

## Topics

- [Mechanical engineering](https://hardwarepodcasts.com/topic/mechanical-engineering)
- [Prototyping & iteration](https://hardwarepodcasts.com/topic/prototyping)
- [PCB design & layout](https://hardwarepodcasts.com/topic/pcb-design)
- [Embedded firmware](https://hardwarepodcasts.com/topic/embedded-firmware)
- [Materials & manufacturing processes](https://hardwarepodcasts.com/topic/materials-and-processes)
- [Debugging & failure analysis](https://hardwarepodcasts.com/topic/debugging-and-failure-analysis)

## Most relevant to

makers and hobbyists

## Mentioned

- James Webb Space Telescope (product)
- Zachary Tong (other)
- PlottyBot (product)
- Ben (other)
- Riskables (other)
- Famicu (other)
- Cry 2001 (product)
- barium sulfate (material)
- PDP-8 (product)
- Q2 (product)
- Joe Wingbermuller (other)
- MSI (other)
- Dave Rountree (other)
- Maya Posh (other)
- Ford Maverick (product)

## Related episodes from other shows

- [Hacked E-Paper Price Tags, Raspberry Pi MCU Dev HAT, Arduino Robot Arm, and More!](https://hardwarepodcasts.com/podcast/the-electromaker-show/2023-01-18-hacked-e-paper-price-tags-raspberry-pi-mcu-dev-hat-arduino-robot-arm-and-more) (The Electromaker Show)
- [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)
- [Raspberry Pi 500, Robot Roadies, Huge 3d Printers and Car Hacking!](https://hardwarepodcasts.com/podcast/the-electromaker-show/2023-11-26-raspberry-pi-500-robot-roadies-huge-3d-printers-and-car-hacking) (The Electromaker Show)
- [83: The First Time I Was Electrocuted](https://hardwarepodcasts.com/podcast/embedded-fm/2015-01-07-83-the-first-time-i-was-electrocuted) (Embedded.fm)

## Citing this page

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