LightInk, a Solar Powered ESP32 Smartwatch
https://hackaday.com/2026/05/05/lightink-a-solar-powered-esp32-smartwatch/

There’s something about the ESP32 family of microcontrollers and timekeeping. We probably see it in clocks as often as we do anything else; we also probably see more clocks with …read more (https://hackaday.com/2026/05/05/lightink-a-solar-powered-esp32-smartwatch/)

A Digital Audio Recorder For TOSLink
https://hackaday.com/2026/05/05/a-digital-audio-recorder-for-toslink/

Every now and then in our travels we come upon a project with such an obvious need that it’s almost a surprise nobody has thought of doing it before. So …read more (https://hackaday.com/2026/05/05/a-digital-audio-recorder-for-toslink/)

How Giant Tanks Of Fluid Could Help Support The Power Grid
https://hackaday.com/2026/05/05/how-giant-tanks-of-fluid-could-help-support-the-power-grid/

If you’ve been paying any attention to the renewable energy space, you’ll know that generation isn’t really the problem anymore. Solar panels are cheap, and wind turbines are everywhere. The …read more (https://hackaday.com/2026/05/05/how-giant-tanks-of-fluid-could-help-support-the-power-grid/)

Using NFC to Power Devices Instead of Qi
https://hackaday.com/2026/05/05/using-nfc-to-power-devices-instead-of-qi/

It shouldn’t be any surprise that NFC and similar RFID implementations are capable of providing power to a receiver, since this is after all how RFID tags can work without …read more (https://hackaday.com/2026/05/05/using-nfc-to-power-devices-instead-of-qi/)

Cutting Steel Gears with Homemade EDM
https://hackaday.com/2026/05/05/cutting-steel-gears-with-homemade-edm/

Electrostatic discharge machining (EDM) may be slower than alternatives like laser cutting, water jets, or a milling machine, but for some applications there’s no alternative: it can cut through any …read more (https://hackaday.com/2026/05/05/cutting-steel-gears-with-homemade-edm/)

Defeating the [Works By Design]’s Unpickable Lock
https://hackaday.com/2026/05/05/defeating-the-works-by-designs-unpickable-lock/

Even though the very concept of an ‘unpickable lock’ is as plausible as making water not be wet, this doesn’t take away from the intellectual thrill of devising solutions to …read more (https://hackaday.com/2026/05/05/defeating-the-works-by-designs-unpickable-lock/)

Earthworms Don’t Bio-Accumulate Microplastics, So There May be Hope For Us
https://hackaday.com/2026/05/05/earthworms-dont-bio-accumulate-microplastics-so-there-may-be-hope-for-us/