Author Archives: M. Eric Carr

PCBWay

Posted on 2021-05-18 by M. Eric Carr

The Hex Decoder project finally gets a modern PCB, thanks to PCBWay. Continue reading →

Posted in Design, Digital, DrACo/Z80, EET325, Electronics, PIC Microcontrollers, Reviews | Leave a comment

Bearing Raceway Speedometer

Posted on 2021-04-30 by M. Eric Carr

A TTGO board, 3D printed enclosure, and some optoelectronics are turned into a speedometer for steel bearing balls. Continue reading →

Posted in 3D Printing, Arduino, C, Coding, Digital | Leave a comment

Digital Microscope

Posted on 2021-03-28 by M. Eric Carr

A “USB digital microscope” from Amazon is reviewed. Continue reading →

Posted in Tools, Toys | Leave a comment

TTGO T-Display I2C pin location

Posted on 2021-02-21 by M. Eric Carr

I2C is broken on the TTGO T-Display. Fortunately, there’s an easy fix. Continue reading →

Posted in Arduino, C, Coding, Digital, Troubleshooting | Leave a comment