Djette
From Hackerspace Brussels
|
more info:
|http://www.ooooo.be/djette
Contents
Concept:[edit]
The BPM of an audio track is regulated by the tempo of biking. The audio equipment is loaded in a bike cart, runs on batteries. An easy manageable device on the steering wheel can be controlled to play funky tracks.
System:[edit]
Tracking of the tempo by a PHOTRESISTOR + ARDUINO + PROCESSING.
Audio by a 9 volt MONO amplifier 3,5WAtt and some old recycled speaker.
Arduino code sound bending: | http://www.adafruit.com/blog/2008/05/21/wave-shield-bending-the-playback-sample-rate
Currently a reed switch is being used, and i found this great manual, tracking the speed of a wheel,
| http://www.youtube.com/watch?v=sl8ItZxGM6E |http://idkfa.com/ec/the-bike/the-bike-how-to/
Potential code:
|http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1257785566
Convert AUDIO WAV for waveshield https://boundaryfunctions.wordpress.com/2010/02/23/batch-converting-audio-using-sox-for-arduino-waveshield/
Style:[edit]
to pimp up the bike with LEDs: |Project Aura
to pimp up the bike with stuff: |CARDS |STRAWS
result[edit]
came up with this -- ptr_
#include <AF_Wave.h>
#include <avr/pgmspace.h>
#include "util.h"
#include "wave.h"
#define B_REED_SWITCH 0
#define B_NEXT 1
#define B_NORMAL 2
byte buttons[] = {
9, 8, 7 };
#define NUMBUTTONS sizeof(buttons)
volatile byte pressed[NUMBUTTONS], justpressed[NUMBUTTONS], justreleased[NUMBUTTONS];
/////////////////////////////////////////////////////////////////////////////// WAVESTUFF
AF_Wave card;
File f;
Wavefile wave; // only one!
uint32_t wavsamplerate = 22050;
char * wavname; // filename WAV file
uint8_t tracknum = 0;
void settrack(uint8_t num){
switch (num){
case 0:
wavname = "TRACK0.WAV";
break;
case 1:
wavname = "TRACK1.WAV";
break;
case 2:
wavname = "TRACK2.WAV";
break;
case 3:
wavname = "TRACK3.WAV";
break;
case 4:
wavname = "TRACK4.WAV";
break;
case 5:
wavname = "TRACK5.WAV";
break;
case 6:
wavname = "TRACK6.WAV";
break;
case 7:
wavname = "TRACK7.WAV";
break;
case 8:
wavname = "TRACK8.WAV";
break;
case 9:
wavname = "TRACK9.WAV";
break;
case 10:
wavname = "TRACK10.WAV";
break;
case 11:
wavname = "TRACK11.WAV";
break;
case 12:
wavname = "TRACK12.WAV";
break;
case 13:
wavname = "TRACK13.WAV";
break;
case 14:
wavname = "TRACK14.WAV";
break;
case 15:
wavname = "TRACK15.WAV";
break;
case 16:
wavname = "TRACK16.WAV";
break;
case 17:
wavname = "TRACK17.WAV";
break;
case 18:
wavname = "TRACK18.WAV";
break;
case 19:
wavname = "TRACK19.WAV";
break;
case 20:
wavname = "TRACK20.WAV";
break;
case 21:
wavname = "TRACK21.WAV";
break;
case 22:
wavname = "TRACK22.WAV";
break;
case 23:
wavname = "TRACK23.WAV";
break;
}
card.reset_dir();
}
void ls() {
char fname[13];
int ret;
card.reset_dir();
putstring_nl("Listing:");
while (1) {
ret = card.get_next_name_in_dir(fname);
if (!ret) {
card.reset_dir();
return;
}
Serial.println(fname);
}
}
bool active_file = false;
void playfile(char *name) {
while (wave.isplaying) {
wave.stop();
}
card.reset_dir();
if(active_file) {
Serial.println("closing previous file");
card.close_file(f);
}
card.reset_dir();
f = card.open_file(name);
Serial.print("opening new file ");
Serial.println(name);
if (!f) {
putstring_nl(" Couldn't open file");
return;
}
active_file = true;
if (!wave.create(f)) {
putstring_nl(" Not a valid WAV");
return;
}
// ok time to play!
wave.play();
}
/////////////////////////////////////////////////////////////////////////////////////////// SETUP
void setup() {
Serial.begin(9600); // set up Serial library at 9600 bps
Serial.println("BOOMBIKE!");
// Set the output pins for the DAC control. This pins are defined in the library
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
if (!card.init_card()) {
putstring_nl("Card init. failed!");
return;
}
if (!card.open_partition()) {
putstring_nl("No partition!");
return;
}
if (!card.open_filesys()) {
putstring_nl("Couldn't open filesys");
return;
}
if (!card.open_rootdir()) {
putstring_nl("Couldn't open dir");
return;
}
pinMode(buttons[B_REED_SWITCH], INPUT); // reed switch
pinMode(buttons[B_NEXT], INPUT); // button next
pinMode(buttons[B_NORMAL], INPUT); // button normal
/*
TCCR2A = 0;
TCCR2B = 1<<CS22 | 1<<CS21 | 1<<CS20;
//Timer2 Overflow Interrupt Enable
TIMSK2 |= 1<<TOIE2;
*/
ls();
}
/*
SIGNAL(TIMER2_OVF_vect) {
check_switches();
}
*/
void check_switches()
{
static byte previousstate[NUMBUTTONS];
static byte currentstate[NUMBUTTONS];
byte index;
for (index = 0; index < NUMBUTTONS; index++) {
currentstate[index] = digitalRead(buttons[index]); // read the button
if (currentstate[index] == previousstate[index]) {
if ((pressed[index] == LOW) && (currentstate[index] == LOW)) {
// just pressed
justpressed[index] = 1;
}
else if ((pressed[index] == HIGH) && (currentstate[index] == HIGH)) {
// just released
justreleased[index] = 1;
}
pressed[index] = !currentstate[index]; // remember, digital HIGH means NOT pressed
}
//Serial.println(pressed[index], DEC);
previousstate[index] = currentstate[index]; // keep a running tally of the buttons
}
}
bool normal_mode = false;
float avgSpeed = 0.0f;
float curSpeed = 0.0f;
unsigned long curTime, prevTime;
/////////////////////////////////////////////////////////////////////////////////////////// LOOP
boolean samplerate_changed = false;
uint32_t lastReedRead = 0;
void loop() {
char c;
check_switches();
if(pressed[B_NEXT] && pressed[B_NORMAL]) {
justpressed[B_NEXT]=0;
justpressed[B_NORMAL]=0;
Serial.println("two buttons pushed");
}
else if( justpressed[B_NEXT] ) {
justpressed[B_NEXT]=0;
Serial.println("B_NEXT pushed");
settrack(tracknum);
Serial.println(wavname);
playfile(wavname);
tracknum++;
}
else if( justpressed[B_NORMAL] ) {
justpressed[B_NORMAL]=0;
Serial.println("B_NORMAL pushed");
normal_mode =!normal_mode;
if(normal_mode) {
Serial.print("playing a fixed bitrate");
wave.setSampleRate(wave.dwSamplesPerSec);
}
else {
Serial.print("playing a dynamic bitrate");
}
}
if(justpressed[B_REED_SWITCH])
{
justpressed[B_REED_SWITCH] = 0;
prevTime = curTime;
curTime = millis();
lastReedRead = curTime;
curSpeed = float(curTime - prevTime);
// cumulative average
const float alpha = 0.5f;
avgSpeed = avgSpeed * (1.0f - alpha) + curSpeed * alpha;
Serial.print("curSpeed: ");
Serial.print(curSpeed);
Serial.print(" avgSpeed: ");
Serial.println(avgSpeed);
// TIMING constantes
//
const float x1 = 1000.0f; // slow sensor timing
const float x2 = 150.0f; // fast sensor timing
const float y1 = 5000.0f;
const float y2 = 25000.0f;
const float m = (y2-y1) / (x2-x1);
float fsamplerate = (avgSpeed * m ) - m * x1 + y1;
if (fsamplerate > 0.0f) wavsamplerate = fsamplerate;
else
wavsamplerate = 0.0;
samplerate_changed = true;
Serial.print("fsamplerate: ");
Serial.println(fsamplerate);
Serial.print(" wavsamplerate: ");
Serial.println(wavsamplerate);
}
if (millis() - lastReedRead > 700) {
if(wavsamplerate>100) wavsamplerate -= 100;
samplerate_changed = true;
// lastReedRead = millis();
}
if(samplerate_changed && wave.isplaying && !normal_mode) {
if (wavsamplerate>25000) wavsamplerate= 25000;
wave.setSampleRate(wavsamplerate);
samplerate_changed = false;
}
}
