Everybody loves the Cheap Yellow Display (CYD) ESP32 dev boards, so why not treat yours to a little PDA? That’s right: turn it into a Portable Digital Assistant and relive …read more (https://hackaday.com/2026/09/26/cheap-yellow-display-dreams-of-pda/)

A Modular Macro Keypad
https://hackaday.com/2026/09/26/a-modular-macro-keypad/

The introduction of the ATmega32U4 microcontroller, with its integrated USB controller, made a lot of hardware tasks much simpler than they were before. One of the arenas it revolutionized was …read more (https://hackaday.com/2026/09/26/a-modular-macro-keypad/)

Basically, Galvanizing Metal Without Acid
https://hackaday.com/2026/09/26/basically-galvanizing-metal-without-acid/

As useful as steel and iron are to the modern world, their tendency to rust is a major downside. There’s a spectrum of ways to prevent it, from quickly slapping …read more (https://hackaday.com/2026/09/26/basically-galvanizing-metal-without-acid/)

When the Debugger Lies With Stale Cache Values
https://hackaday.com/2026/09/27/when-the-debugger-lies-with-stale-cache-values/

In a recent blog post by [Daniel Mangum] he goes over a scenario observed while debugging the Cortex-M33-based nRF54LM20, reading and writing values while running through a few scenarios. After …read more (https://hackaday.com/2026/09/27/when-the-debugger-lies-with-stale-cache-values/)

Reverse Engineering Apple’s Mikey Chip
https://hackaday.com/2026/09/27/reverse-engineering-apples-mikey-chip/

On the old iPods, generally referred to here in the future as iPod Classic, there lives a tiny, undocumented chip called Mikey. It sits at the headphone output and performs …read more (https://hackaday.com/2026/09/27/reverse-engineering-apples-mikey-chip/)

Enormous Fluid Simulation on Flip Dots is also Enormous Amount of Work
https://hackaday.com/2026/09/27/enormous-fluid-simulation-on-flip-dots-is-also-enormous-amount-of-work/

Flip dot displays are cool, and more people realize that after [mitxela]’s fluid simulation on flip dots installation was on display at EMF 2026. As glorious as the result is, …read more (https://hackaday.com/2026/09/27/enormous-fluid-simulation-on-flip-dots-is-also-enormous-amount-of-work/)

Ways To Empirically Identify a Magnet’s Polarity
https://hackaday.com/2026/09/27/ways-to-empirically-identify-a-magnets-polarity/

Every magnet has a north and a south pole, but which is which? Sometimes it matters. If a product one builds features a magnetic closure or other part, the polarity …read more (https://hackaday.com/2026/09/27/ways-to-empirically-identify-a-magnets-polarity/)

Defeating Satellite Spoofing with Galileo’s Encryption
https://hackaday.com/2026/09/27/defeating-satellite-spoofing-with-galileos-encryption/