Author Archives: M. Eric Carr

Mini Museum: Morse Telegraph Relay

Posted on 2022-08-23 by M. Eric Carr

A Morse 4-C relay from circa 1900 is investigated and made to work again, driven by a modern microcontroller. Continue reading →

Posted in Digital, Mini Museum, Nostalgia | Tagged , , , , | Leave a comment

Constructors in FreeBASIC

Posted on 2022-07-11 by M. Eric Carr

FreeBASIC can be made to run arbitrary code, constructor-style, when custom types are allocated. Continue reading →

Posted in BASIC, Coding | Leave a comment

Quadrature Encoders

Posted on 2022-06-30 by M. Eric Carr

Quadrature rotary encoders are inexpensive and very easy to wire up. Here’s how to use them with interrupts in Arduino C for ESP32. Continue reading →

Posted in Arduino, Building blocks, Digital, Electronics, HOW-TO, User Interface Design | Tagged , , , , , , , , , , , , | Leave a comment

New Toy: Round LCD Displays

Posted on 2022-05-29 by M. Eric Carr

Round, Arduino-friendly color LCD displays. These should be fun… Continue reading →

Posted in Arduino, Components, Digital, Toys, User Interface Design | Tagged , , | Leave a comment