Author Archives: M. Eric Carr

Kilowatt Counter Cleverness

Posted on 2026-02-26 by M. Eric Carr

A vintage Westinghouse watt-hour meter uses a unique, efficient readout design. Continue reading →

Posted in Design, Power, User Interface Design | Leave a comment

CYDs (and Vibe Coding)

Posted on 2026-02-26 by M. Eric Carr

The ESP32 “CYD” (“Cheap Yellow Display”) is easy to use, especially when combined with Generative-AI-assisted coding… Continue reading →

Posted in Arduino, C, Coding, Current Events, Digital Citizenship, Fractals, Machine Learning / Neural Networks | Leave a comment

Mini Museum: Cisco 2500 Router

Posted on 2026-01-15 by M. Eric Carr

Cisco routers, particularly the Cisco 2500, helped make the Internet what it is today. Continue reading →

Posted in Digital, Internet, Networking, Nostalgia, System Administration, Tools | Leave a comment

Serial LED Matrix

Posted on 2025-12-31 by M. Eric Carr

Daisy-chained SPI interfaces and fast microcontrollers make driving large, bright LED displays easy. Continue reading →

Posted in C, Components, Electronics, Toys, User Interface Design | Tagged , | Leave a comment