Low-cost and precise rotary encoder with magnetic spheres

You know what they say that constraints drive creativity, I think this post is just another little example of that.

Usually I do not put time constraints to my hobby projects, but I make sure to have some other kind of constraints, like keeping the cost low and trying to reuse stuff that I already have.

In this case I needed a way to measure the angle and speed of a rotating object for some of my projects, and I wanted a rotary encoder that was inexpensive, but precise enough to work at very low speeds.


JMP-rope, the hardware

The hardware of the first JMP-rope prototype is very simple:

JMP-rope internals overview
JMP-rope handle detail
JMP-rope LED strip tied to the rope
JMP-rope programming socket
JMP-rope lit up


Altoids: Exercises in Style

After my cool non-sense story about Android 5 I wanted to get back again to the Altoids theme and expand a bit on it.

Android Blue Knock-Off
Android Green Knock-Off
Android Red Knock-Off
Antonio Red Knock-Off
Arduino Knock-Off
Debian Knock-Off
Drupal Knock-Off
Ladyada Knock-Off
Linux Knock-Off