Author Archives: Andrew

Vibe Vault for Old Versions of Android

By | June 10, 2014

The current version of Vibe Vault supports Android 4.0 and later. But do not dismay if you are one of the ~16.7% of Android users1 running Android 2.x or earlier: I received an e-mail from a user with a phone running Android 2.3.5, and was able to dig up an old version of Vibe Vault… Read More »

Vibe Vault 4.1 Source Code

By | January 28, 2014

It took a while to get up, but the source code for Vibe Vault 4.1 is available here.  Vibe Vault is free software available under the terms of version 3 of the GPL  (license here).  Feel free to ask if you have questions on the code.

Building A Constant Current Driver For High-Power LEDs

By | December 23, 2013

Highly efficient, very powerful LEDs like the Cree XML2 are relatively inexpensive, and have lots of interesting uses.  According to Cree, they can “deliver[ ] an unprecedented 1198 lumens at 116 lumens-per-watt efficacy at 3 A,”1 with a maximum forward voltage somewhere around 3.15V.  To put this efficiency into perspective: incandescent lightbulbs have an efficiency… Read More »