#diy Tech News.

Tech Talkies built walkie-talkies using Seeed Studio XIAO ESP32S3 Sense boards and ESP-NOW over Wi-Fi, avoiding radio license requirements. The devices use a MAX98357A I2S amplifier, PTT button, and thread-safe audio buffering. External antennas provide roughly 200 meters of outdoor range.

GitHub user Lagerpun released a pixel aquarium app for the ESP32 CYD (Cheap Yellow Display). The app includes fish, plants, drifting food, a 12-hour clock with NTP sync, and auto-dimming via light sensor. Code and instructions are available on GitHub for the 2.8-inch touchscreen.

ProjectsInFlight converted a scanning electron microscope into a transmission electron microscope using a DIY reflecting adapter. The main challenge was the 14 mm clearance inside the chamber, solved with a thinner aluminum sample plate. A leaky secondary electron shield was fixed by extending it higher, dramatically improving TEM images.

A Power Wheels car can be upgraded to run on a 20V drill battery for more speed and power. The modification requires a battery dock from a broken tool or a replacement part. The higher voltage system provides a faster ride without dangerous power levels.

The Veltoc Model 01 is an ESP32 e-Ink monitor that tracks temperature, humidity, and pressure. It has a retro look with an e-Ink display. The code and 3D files are on GitHub. Building it avoids buying simple devices and allows easy repairs.

Turnah81 built a non-functional airbag using a pillowcase, PVC tube, and olive jar lid inflated by compressed air instead of pyrotechnics. His first version failed; a later combustion attempt was slower and less effective. The setup used a battery and inertial switch but did not meet safety or deployment standards.

Brian Burgess turned a spare USB drive and a Wi-Fi router into shared network storage without a NAS. The method requires plugging the drive into the router's USB port and configuring storage settings in the router's interface. Any USB drive works if the router provides enough power.