No place like /dev/random? Build your own random number generator with an Americium 241 sample
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SuperCollider
entropy_harvester
howto
remote_control
.gitignore
LICENSE
README.md

README.md

random241

Python scripts for harvesting entropy from a random number generator (with an Americium 241 sample mounted over a webcam sensor as its source). This repository also features an OSC enabled SuperCollider random241.scd script that can interface with it and a rudimental python script read_gpio.py (made for BeagleBone Black) that can be used to further modify effects on the generated sounds in a live setup.

Requirements:

For the entropy_harvester you'll need the following packages and dependencies installed (names may vary depending on your distribution!):

  • python2
  • python2-numpy
  • python2-pyliblo
  • opencv
  • liblo

For the SuperCollider script you'll need SuperCollider installed (duh!).

For the remote_control you'll need the following:

If you want to build your own random number generator from scratch, you can follow my little howto guide (it's far from being perfect though).

Features:

As this is an ongoing project and was executed primarily within the boundaries of my course work for Audiovisual Programming - Embedded Systems led by Fredrik Olofsson at UDK Berlin in 2013/ 2014, bugs can be expected (especially if you set up your own device!) and the reporting of those is very welcome! For an audio example, check out my 1)3/1532 Bandcamp.

Currently the list of features for the entropy_harvester is as follows:

  • Grabbing of bright areas (aka regions of interest in pixels) above a certain threshold from a webcam
  • Calculation of mean x/y values from regions of interest and conversion to float range
  • Sending of time, x and y values via OSC to predefined host and port

The SuperCollider script is able to:

  • Receive OSC messages for the creation of SynthDefs with certain pitch, amplitude, length and loop time, according to coordinates and time sent.
  • Receive OSC messages for manipulation of post processing SynthDefs (FreeVerb for now).
  • Ignore OSC messages after a certain amount of SynthDefs created.
  • Release (all) SynthDefs after a certain amount of SynthDefs is reached.

The remote_control script is able to:

  • Read GPIO data from BeagleBone Black (P9_39-42 for now)
  • Send sensor data as OSC message to predefined host and port

TODOs:

  • Externalization of settings for remote_control and entropy_harvester
  • Further settings and advancements in sound for the SuperCollider script
  • Performance enhancements for entropy_harvester using different search algorithm (maybe even switch to C++)
  • Detection of false positives (pixel errors) on wacky cameras