Boing Boing 

HOWTO sneak an accelerometer-triggered Tardis sfx box into an elevator

The Sparkfun folks have a sweet recipe for building an Arduino-based, accelerometer-triggered Tardis sound-effects box into the ceiling of an elevator, noting that care must be taken not to freak out riders and precipitate a bomb-squad visit.

As it stands, the contraption works well enough (much like the TARDIS itself). But for those looking for perfection, there could be a few improvements. These are left as exercises for the reader:

Improve battery life using sleep mode. Right now the Arduino is on all the time, using about 20mA of current continuously. We’re got a pretty big battery attached to it (6000mAh), which gives it a lifetime of about a week, but the battery could last for months if the project went to sleep between playings. The Arduino can indeed be programmed to go to sleep, waiting for an interrupt signal (a pin changing state) to wake it up. And the ADXL345 accelerometer can be configured so that it sends an interrupt when an acceleration threshold is reached, so this shouldn't be difficult to do. In practice you can’t get down to microamps with a full Arduino board, since it will always be burning some current in the voltage regulator, power LED, etc. But with a bit of software and hardware hacking, sleep mode would definitely improve the lifetime situation.

Stop playing when the elevator stops. Currently, the TARDIS MP3 was edited so that it is approximately the length of an elevator ride, and the code plays the MP3 to the end before listening for further accelerometer bumps. But you could also end a longer MP3 when you detect that the elevator stops (or, since the MP3 chip has a volume control command, you could even fade it out!)

Bigger and better! Bigger speakers, disco lights and music, black lights... you can really go in any direction. Make us proud. But remember...

Elevator TARDIS (Thanks, Bruce!)

HOWTO make a fur-lined barbarian forearm bracer with a digital D&D dice-roller built in

The wizards at Sparkfun, an open source hardware company, show us how to make one of these spiffy furry barbarian leather arm-bracers with a charmingly anachronistic D&D dice-roller built into, built around a Lilypad soft Arduino controller.

I’ve got nothing but respect for the DIY/open source community who take conductive thread, LEDs, and Arduino boxes and make them into marvelous little working crafts. I find it all a bit above my metaphorical pay grade. However, if there was anything that was going to convince me to learn how to rig a circuit, it would be the project that Dia forwarded to us yesterday. ,p> It’s a fur-lined leather gauntlet that can roll 100, 20, 12, 10, 8, 6, and 4-sided dice with the flip of a switch and the shake of a forearm. It combines my love of tabletop with my desire to live in the future where we all poke our wrists to get things done.

Theoretically, there's a complete tutorial for this beauty, but it's 404 at the moment. The link below goes to The Mary Sue's writeup.

New Life Goal: Make a Leather Bracer that Rolls Dice

Arduino device mutes uninteresting celebrities on TV

Matt Richardson of MAKE built this wonderful Arduino device that scans a TV show's closed caption track and mutes the TV when anyone on of his celebrity-blacklist is mentioned.

The Enough Already: The Arduino Solution to Overexposed Celebs