Part 3: Audio & Assembly AwesomenessI wrapped up March with this cool little project - it's a little late on the calendar, but there were some tweaks to be made. Last time, I successfully programmed the Arduino to accept the accelerometer input to trigger audio files, and recorded some WAV files. I tried the cardboard hand from Part 1, but it essentially exploded (due to the inherent awesomeness of my high-five, maybe..). I decided to just bite the bullet and print it on our Objet printer, I may do another with flexible filament after all.
Once the files were cut and loaded on to the SD card, I finished the assembly of the hand with a base that could support a bunch of slaps. I used the shear at TechShop San Francisco to get some 3-inch strips of mild steel, then a vise and a hammer to bang it into a 90-degree shape (I'll let you figure out how to get the other side).
A quick trip to the hardware store netted a spring, some threaded rod, a bushing/spacer and some locking nuts. Basically, the hand/dowel will rotate around the threaded rod - which is locked in place with the nuts - a spring at the base will provide the tension for it to return to neutral. I just used a C-clamp to secure it to a desk and watched my co-workers smack away. A small USB-powered speaker with a headphone jack provides the sound, and I just picked up a dual-USB-plug to power it and the arduino board.
The random clips are pretty funny, I may do something similar soon with microphones. The folks upstairs at Instructables have some pretty heavy feet, we've been scheming to provide them some 'feedback' when footsteps reach a certain decible level.
It's a pretty cool little thing to have on your desk - most people can't resist a high-five. And that's good, because it's rude to leave someone hanging.
Bonus: Here's the raw footage of us recording the audio samples.