Electronics

How to build a photo frame with a Raspberry Pi 3 and the official 7-inch touchscreen, then add automatic display brightness control using a GY-30 BH1750FVI ambient light sensor connected via I2C. The brightness control program is written in Python and published on GitHub.

How to use an M5Stack ATOM Lite and a JJY antenna board to build a low-cost JJY signal simulator for radio-controlled clocks in rooms where the standard time signal cannot be received. Total parts cost under JPY 5,000 — a fraction of commercial retransmitters. Includes setup steps and known limitations.