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Frame from SmackBook Plays via YouTube's privacy-enhanced embed

SmackBook

ealf
Demos
YouTube
Cited on HN 4 times, 2013–2026, never outright recommended score 0
Years with an HN recommendation, 2007–2026

HN cites it as a fun example of novel uses of the MacBook motion sensor whenever laptop accelerometers come up.

A very short demo of SmackBook, a hack that used the MacBook Pro's sudden motion sensor so that smacking the sides of the laptop switches desktop spaces.

“people figured out how to access it back then, with novel uses like smacking your MacBook to change spaces” (HN, 2026)

4 citations · Demos

4 Hacker News comments

From the HN archive; up to 20 kept per video, favoring different commenters. Recommendations first.

@future10se Feb 2026 Cites it
on HN thread Reading the undocumented MEMS accelerometer on Apple Silicon MacBooks via iokit
Read more
Aaackshually, the Sudden Motion Sensor was introduced on 2005 in the PowerBook G4, and continued through the intel MacBooks with hard drives. While officially undocumented, people figured out how to access it back then, with novel uses like smacking your MacBook to change spaces (virtual desktops) or swinging the Mac around to make lightsaber noises. - [this video] - [link] (I should know, I was in university back then and swung my Mac around like an idiot, lol.) On the first Retina MacBook Pro 15" in 2012, and moving forward with all MacBooks that were SSD-only, they removed the SMS as it was not needed. To my knowledge, this is the first time we're hearing that Apple Silicon machines have an accelerometer on the SoC, officially or otherwise. It's also certainly not branded or marketed as the SMS was. ( [link] ) Happy to be corrected on this!
Example of novel uses of the Sudden Motion Sensor

Video list and Hacker News comment labels from HackerTube (prompted by @karpathy), released under ODC-By 1.0, built on the open-index/hacker-news archive. Hacker News data is provided by Y Combinator; comments remain the work of their authors. Video titles, channel names and thumbnails belong to their creators and are shown via YouTube. HackerTube Watch is an unofficial edition. Data export of 2026-10-31.

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