Framed Washington Metro map uses Raspberry Pi Pico W and WMATA departure API to light 144 LEDs live. Laser-cut matboard masks 144 LEDs; data refreshes so you can see every train's position from home.

CNET’s expert staff reviews and rates dozens of new products and services each month, building on more than a quarter century of expertise. Air quality infamously drops as the days grow cold and we ...