An MRI scan is never a pleasant occasion – even if you aren’t worried about the outcome, lying still in a confined, noisy space for long periods of time is …read more (https://hackaday.com/2026/03/22/building-a-laser-driven-photoacoustic-speaker/)

Better Faux-Analog VU Meters
https://hackaday.com/2026/03/23/better-faux-analog-vu-meters/

One of the coolest things about old hi-fi hardware is that it often came with flickety needles that danced with the audio level. You can still buy these if you …read more (https://hackaday.com/2026/03/23/better-faux-analog-vu-meters/)

Stream Deck Radio Controller Built With Cheap Yellow Display
https://hackaday.com/2026/03/23/stream-deck-radio-controller-built-with-cheap-yellow-display/

Stream decks are pretty useful in all kinds of contexts, but commercial models can feel a bit pricy for what is effectively a bunch of buttons. [WhiskeyTangoHotel] has whipped up …read more (https://hackaday.com/2026/03/23/stream-deck-radio-controller-built-with-cheap-yellow-display/)

The Zero-Power Flight Computer
https://hackaday.com/2026/03/23/the-zero-power-flight-computer/

In the early days of aviation, pilots or their navigators used a plethora of tools to solve common navigation and piloting problems. There was definitely a need for some kind …read more (https://hackaday.com/2026/03/23/the-zero-power-flight-computer/)

A Simple Switch for Simply too much Current
https://hackaday.com/2026/03/23/a-simple-switch-for-simply-too-much-current/

A switch is simple: connect two pieces of metal together and bam! Except, it’s not that simple at high currents. How much current? Just about 400 car batteries worth would …read more (https://hackaday.com/2026/03/23/a-simple-switch-for-simply-too-much-current/)

Linux Fu: UPNP A Port Mapping Odyssey
https://hackaday.com/2026/03/23/linux-fu-upnp-a-port-mapping-odyssey/

If you’ve ever run a game server or used BitTorrent, you probably know that life is easier if your router supports UPnP (Universal Plug and Play). This is a fairly …read more (https://hackaday.com/2026/03/23/linux-fu-upnp-a-port-mapping-odyssey/)

Build This Open-Source Graphics Calculator
https://hackaday.com/2026/03/23/build-this-open-source-graphics-calculator/

Graphics calculators are one of those strange technological cul-de-sacs. They rely on outdated technology and should not be nearly as expensive as they are, but market effects somehow keep prices …read more (https://hackaday.com/2026/03/23/build-this-open-source-graphics-calculator/)

Acoustic Drone Detection On the Cheap with ESP32
https://hackaday.com/2026/03/23/acoustic-drone-detection-on-the-cheap-with-esp32/