BeetBox is a simple instrument that allows users to play drum beats by touching actual beets. It is powered by a Raspberry Pi with a capacitive touch sensor and an audio amplifier in a handmade wooden enclosure.
BeetBox is primarily an exploration of perspective and expectations. I’m particularly interested in creating complex technical interactions in which the technology is invisible—both in the sense that the interaction is extremely simple and in the literal sense that no electronic components can be seen.
The enclosure was created from .5″x8″ poplar boards, which I cut to size and finished using various hand and power tools. I used a router for both the edge details and for grooves in which to conceal the wires, and a drill press to create the speaker grill and to bore holes for the beets with a hole saw. I then stained the wood and, after assembly with wood glue and a nail gun, sealed the enclosure with polyurethane.
Touch sensing is handled by an MPR121 Capacitive Touch Sensor from SparkFun, for which I ported existing Arduino code to Python. This board communicates with a Python script on a Raspberry Pi via I2C. The script watches for new touches and triggers drum samples using pygame. Audio from the Pi’s line out is run through a small amplifier I built using an LM386, which is based on a circuit straight from the data sheet. The amp is connected to a salvaged speaker mounted under the holes in the lid.
Source code for the BeetBox is viewable on GitHub.
Each Friday is PiDay here at Adafruit, be sure to check out our posts, tutorials and new Raspberry Pi related products. Have you tried the new “Adafruit Raspberry Pi Educational Linux Distro” ? It’s our tweaked distribution for teaching electronics using the Raspberry Pi. But wait, there’s more! Try our new Raspberry Pi WebIDE! The easiest way to learn programming on a Raspberry Pi.
Want a FREE RASPBERRY PI? All orders over $350 get a FREE Raspberry Pi Model B with 512MB RAM!
Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground” – Adafruit’s Apps!
Maker Business — Transforming Today’s Bad Jobs into Tomorrow’s Good Jobs
Wearables — Not a loophole
Electronics — Rule of thumb: 10mils per amp.
Biohacking — Biomimicry – 8 Useful Technologies Inspired by Nature
No comments yet.
Sorry, the comment form is closed at this time.