thanks to andrew and ezra, we got an official, centralized repository of velosynth firmware up and running.
improvisation with a quad 4093 NAND gate oscillator
working on the speed to pitch logic with max and andrew
now available for download + fabrication from thingiverse.
using a MAX7221 LED driver
"for driving either 64 individual Led’s, or up to 8 digits of 7-segment displays" controlled via 3-wire SPI interface. use the MAX7221 for audio applications (reduced electromagnetic noise).
arduino microcontroller, reading hall effect sensor A1301, and interpolating speed through an AD5206 digital potentiometer that controls a cross-modulated 4093 digital oscillator.
pitch controlled by bicycle wheel motion, timbre by potentiometer. amplified through a guitar amp.