There’s a classic grade school science experiment that involves extracting juice from red cabbage leaves and using it as a pH indicator. It relies on anthocyanins, pigmented compounds that give …read more (https://hackaday.com/2025/03/20/chemistry-meets-mechatronics-in-this-engaging-art-piece/)

Linux Fu: A Warp Speed Prompt
https://hackaday.com/2025/03/20/linux-fu-a-warp-speed-prompt/

If you spend a lot of time at the command line, you probably have either a very basic prompt or a complex, information-dense prompt. If you are in the former …read more (https://hackaday.com/2025/03/20/linux-fu-a-warp-speed-prompt/)

Three SPI Busses Are One Too Many on This Cheap Yellow Display
https://hackaday.com/2025/03/20/three-spi-busses-are-one-too-many-on-this-cheap-yellow-display/

The Cheap Yellow Display may not be the fastest of ESP32 boards with its older model chip and 4 MB of memory, but its low price and useful array of …read more (https://hackaday.com/2025/03/20/three-spi-busses-are-one-too-many-on-this-cheap-yellow-display/)

Laser Harp Sets the Tone
https://hackaday.com/2025/03/20/laser-harp-sets-the-tone/

In many ways, living here in the future is quite exiting. We have access to the world’s information instantaneously and can get plenty of exciting tools and hardware delivered to …read more (https://hackaday.com/2025/03/20/laser-harp-sets-the-tone/)

Backyard Rope Tow from Spare Parts
https://hackaday.com/2025/03/20/backyard-rope-tow-from-spare-parts/

A few years ago, [Jeremy Makes Things] built a rope tow in his back yard so his son could ski after school. Since the lifts at the local hill closed …read more (https://hackaday.com/2025/03/20/backyard-rope-tow-from-spare-parts/)

Solar Power, Logically
https://hackaday.com/2025/03/20/solar-power-logically/

We’ve all seen the ads. Some offer “free” solar panels. Others promise nearly free energy if you just purchase a solar — well, solar system doesn’t sound right — maybe… …read more (https://hackaday.com/2025/03/20/solar-power-logically/)

A Modern Take on the Etch A Sketch
https://hackaday.com/2025/03/20/a-modern-take-on-the-etch-a-sketch/

The Etch A Sketch is a classic children’s toy resembling a picture frame where artwork can be made by turning two knobs attached to a stylus inside the frame. The …read more (https://hackaday.com/2025/03/20/a-modern-take-on-the-etch-a-sketch/)

Cheap Endoscopic Camera Helps Automate Pressure Advance Calibration
https://hackaday.com/2025/03/21/cheap-endoscopic-camera-helps-automate-pressure-advance-calibration/

The difference between 3D printing and good 3D printing comes down to attention to detail. There are so many settings and so many variables, each of which seems to impact …read more (https://hackaday.com/2025/03/21/cheap-endoscopic-camera-helps-automate-pressure-advance-calibration/)

Aluminum Business Cards Make Viable PCB Stencils
https://hackaday.com/2025/03/21/aluminum-business-cards-make-viable-pcb-stencils/