It’s interesting what you see when you train a black light on everyday objects. We strongly suggest not doing this in a hotel room, but if you shine UV light …read more (https://hackaday.com/2021/10/16/unique-seven-segment-display-relies-on-fr-4-fluorescence/)

Where You Are Influences What You Invent
https://hackaday.com/2021/10/16/where-you-are-influences-what-you-invent/

[Timon] just bought a new PCB holder setup for his desk. It’s one of those spring-loaded jobbies that uses strong magnets to hold it up off of a work surface, …read more (https://hackaday.com/2021/10/16/where-you-are-influences-what-you-invent/)

PineTime Smartwatch and Good Code Play Bad Apple
https://hackaday.com/2021/10/16/pinetime-smartwatch-and-good-code-play-bad-apple/

PineTime is the open smartwatch from our friends at Pine64. [TT-392] wanted to prove the hardware can play a full-motion music video, and they are correct, to a point. When …read more (https://hackaday.com/2021/10/16/pinetime-smartwatch-and-good-code-play-bad-apple/)

Fail of the Week: Magnetic Levitation
https://hackaday.com/2021/10/16/fail-of-the-week-magnetic-levitation/

We are big fans of the little desktop magnetic levitation setups that float a small object on a magnet. As [3D Printed Life] points out, they look like magic. He …read more (https://hackaday.com/2021/10/16/fail-of-the-week-magnetic-levitation/)

The Simplest Way To Spot 2.4GHz RF
https://hackaday.com/2021/10/16/the-simplest-way-to-spot-2-4ghz-rf/

When the cool kids are showing off their SDRs it’s easy to forget that a radio receiver can be very simple indeed. The crystal set is one of the earliest …read more (https://hackaday.com/2021/10/16/the-simplest-way-to-spot-2-4ghz-rf/)

It’s A Hack: Air Scrubber Controlled Using The Room Lighting
https://hackaday.com/2021/10/16/its-a-hack-air-scrubber-controlled-using-the-room-lighting/

https://www.youtube.com/watch?v=LjZHeJazibk
" data-image-caption="" data-medium-file="https://hackaday.com/wp-content/uploads/2021/09/Snap-2021-09-27-at-21.19.14.png?w=400" data-large-file="https://hackaday.com/wp-content/uploads/2021/09/Snap-2021-09-27-at-21.19.14.png?w=800">Some products just seem to be designed to be annoying. [hardmar] discovered the air filtration system installed in his son’s basement woodshop was orientated for the best airflow, but rather …read more (https://hackaday.com/2021/10/16/its-a-hack-air-scrubber-controlled-using-the-room-lighting/)

The Wireless PS/2 Keyboard That Never Was
https://hackaday.com/2021/10/16/the-wireless-ps-2-keyboard-that-never-was/

The PS/2-style port was once about as ubiquitous on PCs as USB connectors are today, and more than a few of us accumulated a fair collection of keyboards and mice …read more (https://hackaday.com/2021/10/16/the-wireless-ps-2-keyboard-that-never-was/)

Electronic Covid Test Tear Down Shows Frustrating Example of 1-Time-Use Waste
https://hackaday.com/2021/10/17/electronic-covid-test-tear-down-shows-frustrating-example-of-1-time-use-waste/