Author Archives: M. Eric Carr

DIY Ionic charging

Charging the Fitbit Ionic without the charging cable.
(TL;DR: The center pin is 5V; the outer two are Ground.) Continue reading

Posted in Hacks, HOW-TO, Power, Reverse Engineering, Toys | Leave a comment


NeoPixels make controlling RGB LEDs ridiculously easy. Continue reading

Posted in Arduino, Components, Design, Digital, Electronics, PIC Microcontrollers, Reviews | Leave a comment

2D, 3D printing

Turning a 3D printer into a part-time 2D plotter with a Sharpie bracket and some custom G-code. Continue reading

Posted in 3D Printing, Coding, HOW-TO | Leave a comment

Polyphonic Music On An Arduino

The Arduino tone() function can be tricked into playing chord-like sounds. Here’s how. Continue reading

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