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.

Elvis Picardo is a regular contributor to Investopedia and has 25+ years of experience as a portfolio manager with diverse capital markets experience. Erika Rasure is globally-recognized as a leading ...

Holman W. Jenkins Jr. is a member of the editorial board of The Wall Street Journal. He writes the twice-weekly “Business World” column that appears on the paper's op-ed page on Wednesdays and ...

Beverly is a writer, editor, and paralegal specializing in personal finance and tax law. She covers personal financial and legal topics, as well as tax breaks, tax preparation software, and tax law ...

Optical sensors are a broad class of device for detecting light intensity. This can be just a simple component for notifying when ambient light levels rise above or fall below a prescribed level, or a ...