DIY Float Valve for Passive Hydroponics Leverages 3D Printing
https://hackaday.com/2022/02/19/diy-float-valve-for-passive-hydroponics-leverages-3d-printing/

[Billy] has a special interest in passive hydroponics (also known as the Kratky method), which is a way of growing plants in nutrient-rich water that does not circulate. As the …read more (https://hackaday.com/2022/02/19/diy-float-valve-for-passive-hydroponics-leverages-3d-printing/)

DIY Hydrophone Listens in on the Deep for Cheap
https://hackaday.com/2022/02/19/diy-hydrophone-listens-in-on-the-deep-for-cheap/

The microphone is a pretty ubiquitous piece of technology that we’re all familiar with, but what if you’re not looking to record audio in the air, and instead want to …read more (https://hackaday.com/2022/02/19/diy-hydrophone-listens-in-on-the-deep-for-cheap/)

Make Your Own Tabletop Game Organizers With Online Tool
https://hackaday.com/2022/02/19/make-your-own-tabletop-game-organizers-with-online-tool/

There is a vibrant cottage industry built around selling accessories to improve the storage and organization of tabletop games, but the more DIY-minded will definitely appreciate [Steve Genoud]’s deckinabox tool, …read more (https://hackaday.com/2022/02/19/make-your-own-tabletop-game-organizers-with-online-tool/)

Spectrometer Detects Chemicals by Zapping Samples With a Laser Beam
https://hackaday.com/2022/02/19/spectrometer-detects-chemicals-by-zapping-samples-with-a-laser-beam/

Here at Hackaday, we love projects that result in useful lab equipment for a fraction of the cost of professional gear. [Lorenz], over at Advanced Tinkering, built his own instrument …read more (https://hackaday.com/2022/02/19/spectrometer-detects-chemicals-by-zapping-samples-with-a-laser-beam/)

Homemade Panadapter Brings Waterfall to Old Radio
https://hackaday.com/2022/02/20/homemade-panadapter-brings-waterfall-to-old-radio/

Ham radio operators can be pretty selective about their gear. Some are old-school tube purists who would never think of touching a rig containing transistors, and others are perfectly happy …read more (https://hackaday.com/2022/02/20/homemade-panadapter-brings-waterfall-to-old-radio/)

How a Pentester Gets Root
https://hackaday.com/2022/02/20/how-a-pentester-gets-root/

Have you ever wanted to be a fly on the wall, watching a penetration tester attack a new machine — working their way through the layers of security, ultimately leveraging …read more (https://hackaday.com/2022/02/20/how-a-pentester-gets-root/)

All About Dichroic Optical Filters
https://hackaday.com/2022/02/20/all-about-dichroic-optical-filters/