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Green Noise Experiment

This post relates to my "Green Noise Experiment" at Uncraftivism, Arnolfini Bristol, 12-14 December 2009.

Participant #27, 13:55, 10m, green, maleJohn Honniball, LFSH White Noise CircuitGreen Noise Experiment





An experiment will be carried out producing 3 devices capable of inducing hallucinations through sensory deprivation.

  1. A CD player and headphones containing 20 minutes of green noise, and some ping pong balls and sticky tape to cover eyes. I'm considering creating a second CD with some natural green noise collected from around Bristol.

  2. a white mask with an arduino microprocessor and 2 piezoelectric buzzers producing white noise near the wearer's ears. Current status - the white noise device and white piezoelectrically modified earmuffs are ready. I've decided not to use the mask. It fits and works, but is easy to break and difficult to put on

  3. Two simple white and pink noise circuits (made with the help of other dorkbot members) one using Linear Feedback Shift Circuits and Xor chips, and the other using an even simpler "good enough for me" pink noise circuit. I will be constructing some piezo earmuffs on Sunday morning so that one of these machines can also be used by participants.

All three devices will be usable in some way by the audience, who will be able to wear the device in a quiet area for up to 20 minutes, and will be invited to write their experiences for posterity.

Here, meanwhile is the code for device #2: the arduino based white noise generator, from Dorkbot member John Honnibal:



/* Pseudo-Random Bit Sequence Generator 2009-11-25 */
/* Copyright (c) 2009 John Honniball, Dorkbot Bristol */

/*
* For a discussion of PRBS generators, see The Art Of Electronics, by
* Horowitz and Hill, Second Edition, pages 655 to 660. For more info
* on Linear Feedback Shift Registers, see Wikipedia:
* http://en.wikipedia.org/wiki/Linear_feedback_shift_register
* For the actual shift register taps, refer to this article on noise
* generation for synthesisers:
* http://www.electricdruid.net/index.php?page=techniques.practicalLFSRs
*/

// Choose the same pin as the "Melody" example sketch http://www.arduino.cc/en/Tutorial/PlayMelody
int speakerPin = 9;

unsigned long int reg;

void setup ()
{
// Serial setup for debugging only; slows down the program far too much
// for audible white noise
Serial.begin (9600);

// Connect a piezo sounder between Ground and this pin
pinMode (speakerPin, OUTPUT);

// Arbitrary inital value; must not be zero
reg = 0x55aa55aaL;
}


void loop ()
{
unsigned long int newr;
unsigned char lobit;
unsigned char b31, b29, b25, b24;

// Extract four chosen bits from the 32-bit register
b31 = (reg & (1L <<>> 31;
b29 = (reg & (1L <<>> 29;
b25 = (reg & (1L <<>> 25;
b24 = (reg & (1L <<>> 24;

// EXOR the four bits together
lobit = b31 ^ b29 ^ b25 ^ b24;

// Shift and incorporate new bit at bit position 0
newr = (reg << reg =" newr;">



It works a treat! I think the arduino and it's batteries might be happy to live in a bottle with wires coming out of it into the mask. The first thought when the circuits were ready was that I'll have to add an on / off switch.

This morning I made some video of the first stages of putting together a mask for the ping pong ball eyes, hoping to mix them soon.

Ale with ping pong eyes

A simple way to apply ping pong balls to eyes comfortably is by glueing some cotton wool around the edges but I have gone for taping the half balls directly. The white mask will hopefully be a step up from this. It is not complete but will be on show, in case ideas come forward for improving it.

As you can tell, the experiment has now taken place. There are now write ups in various places, and possibly followup information on the _GNE Device and the piezoelectric earmuffs or other information will follow soon on this blog.

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