These days Points of Sale (PoS) usually include a digital payment terminal of some description, some of which are positively small, such as the Mini PoS terminals that PAX sells. …read more (https://hackaday.com/2025/09/12/running-code-on-a-pax-credit-card-payment-machine/)

What Is the Fourier Transform?
https://hackaday.com/2025/09/12/what-is-the-fourier-transform/

Over at Quanta Magazine [Shalma Wegsman] asks What Is the Fourier Transform? [Shalma] begins by telling you a little about Joseph Fourier, the French mathematician with an interest in heat …read more (https://hackaday.com/2025/09/12/what-is-the-fourier-transform/)

Musical Motors, BLDC Edition
https://hackaday.com/2025/09/12/musical-motors-bldc-edition/

This should count as a hack: making music from a thing that should not sing. In this case, [SIROJU] is tickling the ivories with a Brushless DC motor, or BLDC.  …read more (https://hackaday.com/2025/09/12/musical-motors-bldc-edition/)

Design Scanimations In a Snap With The Right Math
https://hackaday.com/2025/09/13/design-scanimations-in-a-snap-with-the-right-math/

Barrier-grid animations (also called scanimations) are a thing most people would recognize on sight, even if they didn’t know what they were called. Move a set of opaque strips over …read more (https://hackaday.com/2025/09/13/design-scanimations-in-a-snap-with-the-right-math/)

Turning a Milling Machine into a Lathe
https://hackaday.com/2025/09/13/turning-a-milling-machine-into-a-lathe/

If you’re planning to make a metalworking lathe out of a CNC milling machine, you probably don’t expect getting a position sensor to work to be your biggest challenge. Nevertheless, …read more (https://hackaday.com/2025/09/13/turning-a-milling-machine-into-a-lathe/)

Keep Reading, Keep Watching
https://hackaday.com/2025/09/13/keep-reading-keep-watching/

I’ve been flying quadcopters a fair bit lately, and trying to learn some new tricks also means crashing them, which inevitably means repairing them. Last weekend, I was working on …read more (https://hackaday.com/2025/09/13/keep-reading-keep-watching/)

ESP32 Hosts Functional Minecraft Server
https://hackaday.com/2025/09/13/esp32-hosts-functional-minecraft-server/

If you haven’t heard of Minecraft, well, we hope you enjoyed your rip-van-winkle nap this past decade or so. For everyone else, you probably at least know that this is …read more (https://hackaday.com/2025/09/13/esp32-hosts-functional-minecraft-server/)