If you read about Hall effect sensors — the usual way to detect and measure magnetic fields these days — it sounds deceptively simple. There’s a metal plate with current …read more (https://hackaday.com/2025/12/24/roll-your-own-hall-effect-sensor/)

DIY E-Reader Folds Open Like a Book
https://hackaday.com/2025/12/24/diy-e-reader-folds-open-like-a-book/

There are plenty of lovely e-readers out on the market that come with an nice big e-paper display. There aren’t nearly as many that come with two. [Martin den Hoed] developed the …read more (https://hackaday.com/2025/12/24/diy-e-reader-folds-open-like-a-book/)

Disposable Camera Viewfinder Becomes 3D Printed Lens
https://hackaday.com/2025/12/24/disposable-camera-viewfinder-becomes-3d-printed-lens/

Disposable cameras are a fun way to get into classical photography. However, they can also be a valuable source of interesting parts that can be put to other uses. For …read more (https://hackaday.com/2025/12/24/disposable-camera-viewfinder-becomes-3d-printed-lens/)

Abusing x86 SIMD Instructions to Optimize PlayStation 3 Emulation
https://hackaday.com/2025/12/24/abusing-x86-simd-instructions-to-optimize-playstation-3-emulation/

Key to efficient hardware emulation is an efficient mapping to the underlying CPU’s opcodes. Here one is free to target opcodes that may or may not have been imagined for …read more (https://hackaday.com/2025/12/24/abusing-x86-simd-instructions-to-optimize-playstation-3-emulation/)

Mesh “Lens” Lets Your Camera Make Weird Pixel Art
https://hackaday.com/2025/12/24/mesh-lens-lets-your-camera-make-weird-pixel-art/

We seldom talk about 3D printing lenses because most techniques can’t possibly produce transparent parts of optical quality. However, you can 3D print something like a lens, as [Luke Edwin] demonstrates, …read more (https://hackaday.com/2025/12/24/mesh-lens-lets-your-camera-make-weird-pixel-art/)