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[Arduino] Checking if the room light is on from the outside. Building a "Door-Through Lighting Indicator" that runs with auto-calibration and ultra-low power consumption

Have you ever been in a situation, whether in a conference room, a private office, or a room in your own home, where you can't tell if someone is inside (or if the light is on) from the outside ...
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[Kato RC #29] The Day AI Started Living in a Microcontroller for $44 — How the Arduino UNO Q Changed the 'Definition of Electronics Hobbyism'

In October 2025, Qualcomm acquired Arduino. At that moment, shockwaves ran through the maker community worldwide. 'Arduino is dead,' 'This is the end of open source.' Reddit erupted, and the Hacker ...
Hackaday

Accurate Split-Flap Display Can Be 3D Printed

Split-flap displays are a great, low-power way to display text to a wide audience. Compared to other display technologies ...
Hackaday

transparent oled

This DIY lasertag project designed by [Nii], which he brought to Tokyo Maker Faire back in September, is a treasure trove. It’s all in Japanese and you’ll need to visit X (formerly Twitter) to see it, ...