Biofeedback is the idea of making one conscious of a biological process or feature, and then using this to try and exert control over the very same. [Mariia Hruntes] demonstrates …read more (https://hackaday.com/2026/05/19/biofeedback-butterfly-beats-with-a-pulse/)

How Pulse Oximetry Figures Out Your Blood Oxygen Levels
https://hackaday.com/2026/05/19/how-pulse-oximetry-figures-out-your-blood-oxygen-levels/

If you’ve ever had a medical team investigating cardiac issues, you’ve probably had a bunch of electrodes stuck all over your chest and been hooked up to an electrocardiogram. This …read more (https://hackaday.com/2026/05/19/how-pulse-oximetry-figures-out-your-blood-oxygen-levels/)

Recreating a Broken Laminated Wooden Furniture Part
https://hackaday.com/2026/05/19/recreating-a-broken-laminated-wooden-furniture-part/

Everyone loves those rather bouncy wooden lounge chairs that got popularized by a certain Swedish seller of furniture, but as tough as they are, the laminated wood can still break …read more (https://hackaday.com/2026/05/19/recreating-a-broken-laminated-wooden-furniture-part/)

Building a Pip Boy Themed Smartwatch
https://hackaday.com/2026/05/19/building-a-pip-boy-themed-smartwatch/

One of the problems with good science fiction is that it introduces us to all kinds of cool devices that we can’t actually have in real life. [Huy Vector] has …read more (https://hackaday.com/2026/05/19/building-a-pip-boy-themed-smartwatch/)

The 8-bit Web Server
https://hackaday.com/2026/05/19/the-8-bit-web-server/

Even [maurycyz] doesn’t think it is a good idea, but it is possible to use an AVR 8-bit CPU to serve web pages. Of course, it is a vastly simplified …read more (https://hackaday.com/2026/05/19/the-8-bit-web-server/)

Building A Device To Map Magnetic Fields
https://hackaday.com/2026/05/19/building-a-device-to-map-magnetic-fields/

Magnetic fields are all around us. We can’t really feel or see them ourselves, per se, but we can map them with the right hardware, like this device built by …read more (https://hackaday.com/2026/05/19/building-a-device-to-map-magnetic-fields/)

Using 3D Printers To Make Circuit Boards
https://hackaday.com/2026/05/19/using-3d-printers-to-make-circuit-boards/

Custom printed circuit boards have become more and more accessible to the average hobbyist over the last decade. But one problem still remains: your circuits will take at least a …read more (https://hackaday.com/2026/05/19/using-3d-printers-to-make-circuit-boards/)

DecayDock Keeps Track of Spoilage
https://hackaday.com/2026/05/20/decaydock-keeps-track-of-spoilage/