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This article describes a DIY business card designed with PCBs that uses NFC energy harvesting to power LED animations without batteries, involving MCU implementation and techniques like Charlieplexing.
A physicist built an ESP32-based speed and distance tracker for his hamster's wheel, automatically uploading nightly runs to the hamster's own Strava account. The hamster logs surprisingly long distances, like 6 miles in a single night.
Zeus WPI details building a local positioning system using Ultra-Wideband to track runners at the 12Urenloop race, replacing Bluetooth-based lap counting with centimeter-level localization.
A detailed build log for Birduino, a card-triggered audio player that plays bird calls when NFC-tagged cards are tapped, built on the open-source TonUINO platform with an Arduino Nano and RFID reader.
A 16-year-old used Claude AI to write a program and built a portable positioning device that receives Starlink satellite beacon signals for about $180 in hardware. It sells for $899 and has sold 350 units. No GPS or network required for positioning.
This article describes the author's project of bringing the pinball table from the classic Windows game "Space Cadet Pinball" to life, building a real mechanical pinball machine from scratch using 3D printing, microcontrollers, and homemade mechanisms. It details the design and iteration of rebound buffers, drop targets, slingshots, and other features.