Looking at how to fit the new (improved) mini amps into the Space Rock shells.
Category: sketches
Plinths
Working with the dimensions of the tops of the plinths for display.
Thinking about networks
Thinking about the network that connects the Space Rocks. Initially I started with the idea of all four rocks connecting equally, which isn’t really possible.
The network will be connected as a star formation, as shown here:
Similar to this diagram I drew a while back:
Ending up with something akin to this:
The co-ordinator would be loaded with one Mozzi synth, and the same synth is installed on the three nodes, with each node changing a different filter (attack, decay and sustain). The code for this looks like so:
Co-ordinator:
// include all libraries #include <XBee.h> #include <SoftwareSerial.h> #include <MozziGuts.h> #include <Oscil.h> #include <EventDelay.h> #include <ADSR.h> #include <tables/sin8192_int8.h> #include <mozzi_rand.h> #include <mozzi_midi.h> // uncomment the following line to enable debug output #define DEBUG // debug macros #ifdef DEBUG #define DEBUG_BEGIN(x) Serial.begin (x) #define DEBUG_PRINT(x) Serial.print (x) #define DEBUG_PRINTLN(x) Serial.println (x) #else #define DEBUG_BEGIN(x) #define DEBUG_PRINT(x) #define DEBUG_PRINTLN(x) #endif // Mozzi control rate in Hz #define CONTROL_RATE 128 Oscil <8192, AUDIO_RATE> aOscil(SIN8192_DATA); // for triggering the envelope EventDelay noteDelay; ADSR <CONTROL_RATE, CONTROL_RATE> envelope; boolean note_is_on = true; byte gain; // XBee packet reception timeout in ms #define XBEE_PACKET_TIMEOUT 250 // RSSI reading timeout in us #define RSSI_READING_TIMEOUT 100 // Arduino pin connections #define RSSI_PIN 5 #define XBEE_DOUT 6 #define XBEE_DIN 7 #define AUDIO_PIN 9 // freqency range bounds in Hz #define ATTACK_LOW 0 #define ATTACK_HIGH 1000 #define DECAY_LOW 0 #define DECAY_HIGH 1000 #define SUSTAIN_LOW 0 #define SUSTAIN_HIGH 1000 // RSSI range bounds int RSSI_LOW = 25; int RSSI_HIGH = 45; int RSSI_LOW_2 = 25; int RSSI_HIGH_2 = 45; int RSSI_LOW_3 = 25; int RSSI_HIGH_3 = 45; // number of samples for moving average filter #define SAMPLES 10 // XBee object instance XBee xbee = XBee(); // address of destination XBee (node address) XBeeAddress64 addr64 = XBeeAddress64(0x0013a200, 0x40A58A5D); // packet to be sent to coordinator uint8_t ping[] = {0xAA, 0xAA}; ZBTxRequest pingRequest = ZBTxRequest(addr64, ping, sizeof(ping)); XBeeResponse response = XBeeResponse(); // create reusable response objects for responses we expect to handle ZBRxResponse rx = ZBRxResponse(); // SoftwareSerial port SoftwareSerial beeSerial(XBEE_DOUT, XBEE_DIN); // Mozzi sine oscillator //Oscil <SIN2048_NUM_CELLS, AUDIO_RATE> aSin(SIN2048_DATA); // array to hold RSSI samples for filter float rssiSamples[SAMPLES]; // current position in array int pos = 0; float rssiAttack = 0; float rssiDecay = 0; float rssiSustain = 0; // moving average filter float movingAverage(float* arr, int newValue, int pos) { // update array arr[pos] = newValue; // get array total float total = 0; for (int i = 0; i < SAMPLES; i++) { total += arr[i]; } // get average float average = total / (float)SAMPLES; return (average); } void setup() { randSeed(); // fresh random noteDelay.set(2000); // begin Serial communication with PC DEBUG_BEGIN(9600); // set pin modes pinMode(RSSI_PIN, INPUT); pinMode(AUDIO_PIN, OUTPUT); // initialize array contents to 0 for (int i = 0; i < SAMPLES; i++) { rssiSamples[i] = 0; } // begin Serial communication with XBee beeSerial.begin(9600); // set XBee serial port xbee.setSerial(beeSerial); // start Mozzi startMozzi(CONTROL_RATE); // set output frequency to the lowest value //aSin.setFreq(FREQ_LOW); } unsigned int duration, attack, decay, sustain, release_ms; void updateControl() { // send packet to node xbee.send(pingRequest); // try to receive pong packet if (xbee.readPacket(XBEE_PACKET_TIMEOUT)) { if (xbee.getResponse().isAvailable()) { if (xbee.getResponse().getApiId() == 16) { xbee.getResponse().getZBRxResponse(rx); uint16_t sender = rx.getRemoteAddress16(); //DEBUG_PRINTLN(sender); if (sender == 18431) { // try to read raw RSSI value int rssiRaw = pulseIn(RSSI_PIN, HIGH, RSSI_READING_TIMEOUT); // check if the read was successful if (rssiRaw > 0) { if (rssiRaw <= RSSI_LOW) { RSSI_LOW = rssiRaw; } if (rssiRaw >= RSSI_HIGH) { RSSI_HIGH = rssiRaw; } // if so, map the raw RSSI value to frequency range int rssiMapped = map(rssiRaw, RSSI_LOW, RSSI_HIGH, ATTACK_LOW, ATTACK_HIGH); // filter RSSI value rssiAttack = movingAverage(rssiSamples, rssiMapped, pos); // check array position overflow if (pos == SAMPLES - 1) { pos = 0; } else { pos++; } // print both values to PC for debugging /*DEBUG_PRINT(rssiRaw); DEBUG_PRINT('\t'); DEBUG_PRINT(rssiMapped); DEBUG_PRINT('\t'); DEBUG_PRINTLN(rssiFiltered);*/ } } else if (sender == 24063) { int rssiRaw = pulseIn(RSSI_PIN, HIGH, RSSI_READING_TIMEOUT); // check if the read was successful if (rssiRaw > 0) { if (rssiRaw <= RSSI_LOW_2) { RSSI_LOW_2 = rssiRaw; } if (rssiRaw >= RSSI_HIGH_2) { RSSI_HIGH_2 = rssiRaw; } // if so, map the raw RSSI value to frequency range int rssiMapped = map(rssiRaw, RSSI_LOW_2, RSSI_HIGH_2, DECAY_LOW, DECAY_HIGH); // filter RSSI value rssiDecay = movingAverage(rssiSamples, rssiMapped, pos); // check array position overflow if (pos == SAMPLES - 1) { pos = 0; } else { pos++; } // print both values to PC for debugging /*DEBUG_PRINT(rssiRaw); DEBUG_PRINT('\t'); DEBUG_PRINT(rssiMapped); DEBUG_PRINT('\t'); DEBUG_PRINTLN(rssiFiltered);*/ } } else if (sender == 20479) { int rssiRaw = pulseIn(RSSI_PIN, HIGH, RSSI_READING_TIMEOUT); // check if the read was successful if (rssiRaw > 0) { if (rssiRaw <= RSSI_LOW_3) { RSSI_LOW_3 = rssiRaw; } if (rssiRaw >= RSSI_HIGH_3) { RSSI_HIGH_3 = rssiRaw; } // if so, map the raw RSSI value to frequency range int rssiMapped = map(rssiRaw, RSSI_LOW_3, RSSI_HIGH_3, SUSTAIN_LOW, SUSTAIN_HIGH); // filter RSSI value rssiSustain = movingAverage(rssiSamples, rssiMapped, pos); // check array position overflow if (pos == SAMPLES - 1) { pos = 0; } else { pos++; } // print both values to PC for debugging /*DEBUG_PRINT(rssiRaw); DEBUG_PRINT('\t'); DEBUG_PRINT(rssiMapped); DEBUG_PRINT('\t'); DEBUG_PRINTLN(rssiFiltered);*/ } } } } } if (noteDelay.ready()) { // choose envelope levels byte attack_level = rand(128) + 127; byte decay_level = rand(255); envelope.setADLevels(attack_level, decay_level); // generate a random new adsr parameter value in milliseconds int r = rand(1000) - rand(1000); unsigned int new_value = abs(r); release_ms = new_value; // randomly choose one of the adsr parameters and set the new value /*switch (rand(4)){ case 0: attack = new_value; break; case 1: decay = new_value; break; case 2: sustain = new_value; break; case 3: release_ms = new_value; break; }*/ attack = rssiAttack; decay = rssiDecay; sustain = rssiSustain; envelope.setTimes(attack, decay, sustain, release_ms); envelope.noteOn(); byte midi_note = rand(107) + 20; aOscil.setFreq((int)mtof(midi_note)); DEBUG_PRINT("ATTACK - "); DEBUG_PRINTLN(attack); DEBUG_PRINT("DECAY - "); DEBUG_PRINTLN(decay); DEBUG_PRINT("SUSTAIN - "); DEBUG_PRINTLN(sustain); // print to screen /*Serial.print("midi_note\t"); Serial.println(midi_note); Serial.print("attack_level\t"); Serial.println(attack_level); Serial.print("decay_level\t"); Serial.println(decay_level); Serial.print("attack\t\t"); Serial.println(attack); Serial.print("decay\t\t"); Serial.println(decay); Serial.print("sustain\t\t"); Serial.println(sustain); Serial.print("release\t\t"); Serial.println(release_ms); Serial.println();*/ noteDelay.start(attack + decay + sustain + release_ms); } envelope.update(); gain = envelope.next(); // this is where it's different to an audio rate envelope } int updateAudio() { return (int) (gain * aOscil.next()) >> 8; } void loop() { audioHook(); }
And the three nodes:
// include all libraries #include <XBee.h> #include <SoftwareSerial.h> #include <MozziGuts.h> #include <Oscil.h> // oscillator template #include <tables/sin2048_int8.h> // sine table for oscillator #include <RollingAverage.h> #include <ControlDelay.h> // uncomment the following line to enable debug output #define DEBUG // debug macros #ifdef DEBUG #define DEBUG_BEGIN(x) Serial.begin (x) #define DEBUG_PRINT(x) Serial.print (x) #define DEBUG_PRINTLN(x) Serial.println (x) #else #define DEBUG_BEGIN(x) #define DEBUG_PRINT(x) #define DEBUG_PRINTLN(x) #endif unsigned int echo_cells_1 = 32; unsigned int echo_cells_2 = 60; unsigned int echo_cells_3 = 127; // Mozzi control rate in Hz ControlDelay <128, int> kDelay; // 2seconds // oscils to compare bumpy to averaged control input Oscil <SIN2048_NUM_CELLS, AUDIO_RATE> aSin0(SIN2048_DATA); Oscil <SIN2048_NUM_CELLS, AUDIO_RATE> aSin1(SIN2048_DATA); Oscil <SIN2048_NUM_CELLS, AUDIO_RATE> aSin2(SIN2048_DATA); Oscil <SIN2048_NUM_CELLS, AUDIO_RATE> aSin3(SIN2048_DATA); // use: RollingAverage <number_type, how_many_to_average> myThing RollingAverage <int, 32> kAverage; // how_many_to_average has to be power of 2 int averaged; float rssiFiltered = 512; // XBee packet reception timeout in ms #define XBEE_PACKET_TIMEOUT 250 // RSSI reading timeout in us #define RSSI_READING_TIMEOUT 100 // Arduino pin connections #define RSSI_PIN 5 #define XBEE_DOUT 6 #define XBEE_DIN 7 #define AUDIO_PIN 9 // freqency range bounds in Hz #define FREQ_LOW 512 #define FREQ_HIGH 1023 // RSSI range bounds int RSSI_LOW = 11; int RSSI_HIGH = 20; // number of samples for moving average filter #define SAMPLES 10 // XBee object instance XBee xbee = XBee(); // address of destination XBee (coordinator address) XBeeAddress64 addr64 = XBeeAddress64(0x0013a200, 0x4176E94F); // packet to be sent to coordinator uint8_t pong[] = {0xAA, 0xAA}; ZBTxRequest pongRequest = ZBTxRequest(addr64, pong, sizeof(pong)); XBeeResponse response = XBeeResponse(); // create reusable response objects for responses we expect to handle ZBRxResponse rx = ZBRxResponse(); // SoftwareSerial port SoftwareSerial beeSerial(XBEE_DOUT, XBEE_DIN); // Mozzi sine oscillator Oscil <SIN2048_NUM_CELLS, AUDIO_RATE> aSin(SIN2048_DATA); // array to hold RSSI samples for filter float rssiSamples[SAMPLES]; // current position in array int pos = 0; // moving average filter float movingAverage(float* arr, int newValue, int pos) { // update array arr[pos] = newValue; // get array total float total = 0; for (int i = 0; i < SAMPLES; i++) { total += arr[i]; } // get average float average = total / (float)SAMPLES; return (average); } void setup() { // begin Serial communication with PC DEBUG_BEGIN(9600); // set pin modes pinMode(RSSI_PIN, INPUT); pinMode(AUDIO_PIN, OUTPUT); // initialize array contents to 0 for (int i = 0; i < SAMPLES; i++) { rssiSamples[i] = 0; } // begin Serial communication with XBee beeSerial.begin(9600); // set XBee serial port xbee.setSerial(beeSerial); // start Mozzi kDelay.set(echo_cells_1); startMozzi(); // set output frequency to the lowest value //aSin.setFreq(FREQ_LOW); } void updateControl() { // try to receive ping packet with 250 ms timeout if (xbee.readPacket(XBEE_PACKET_TIMEOUT)) { if (xbee.getResponse().isAvailable()) { //DEBUG_PRINTLN(xbee.getResponse().getApiId()); if (xbee.getResponse().getApiId() == 16) { xbee.getResponse().getZBRxResponse(rx); uint16_t sender = rx.getRemoteAddress16(); //DEBUG_PRINTLN(sender); } } // try to read raw RSSI value with 100 us timeout int rssiRaw = pulseIn(RSSI_PIN, LOW, RSSI_READING_TIMEOUT); // check if the read was successful if (rssiRaw > 0) { // if so, map the raw RSSI value to frequency range if (rssiRaw <= RSSI_LOW) { RSSI_LOW = rssiRaw; } if (rssiRaw >= RSSI_HIGH) { RSSI_HIGH = rssiRaw; } int rssiMapped = map(rssiRaw, RSSI_LOW, RSSI_HIGH, FREQ_LOW, FREQ_HIGH); // filter RSSI value rssiFiltered = movingAverage(rssiSamples, rssiMapped, pos); // check array position overflow if (pos == SAMPLES - 1) { pos = 0; } else { pos++; } // print both values to PC for debugging /*DEBUG_PRINT(rssiRaw); DEBUG_PRINT('\t'); DEBUG_PRINT(rssiMapped); DEBUG_PRINT('\t'); DEBUG_PRINTLN(rssiFiltered);*/ DEBUG_PRINT(rssiFiltered); DEBUG_PRINT(" - "); DEBUG_PRINT(RSSI_LOW); DEBUG_PRINT(" - "); DEBUG_PRINTLN(RSSI_HIGH); //rssiFiltered); // adjust sine wave frequency //aSin.setFreq(rssiFiltered); } } averaged = kAverage.next(rssiFiltered); aSin0.setFreq(averaged); aSin1.setFreq(kDelay.next(averaged)); aSin2.setFreq(kDelay.read(echo_cells_2)); aSin3.setFreq(kDelay.read(echo_cells_3)); // send packet to coordinator xbee.send(pongRequest); // delay(2000); } int updateAudio() { return 3 * ((int)aSin0.next() + aSin1.next() + (aSin2.next() >> 1) + (aSin3.next() >> 2)) >> 3; //return aSin.next(); } void loop() { pong[0] = 100 >> 8 & 0xff; pong[1] = 100 & 0xff; audioHook(); }
We Are Here exhibition catalogue preview
Here’s a sneak preview of the We Are Here exhibition catalogue.
Space Rock stands
Some ideas for the stands for the Space Rocks. Plus revised drawing of exhibition set-up. The stands would be milled from wood.
Display stands for the Space Rocks
Some designs for the stands for the Space Rocks.
We Are Here
Ubik – collages
A set of 14 collages based on based on snippets of text from Philip K. Dick’s 1969 sci-fi novel Ubik. These were created some time ago, but recently photographed and processed through Instagram.
View the full Flickr set here.
In 1974, French filmmaker Jean-Pierre Gorin commissioned Dick to write a screenplay for a Ubik film. Dick completed the screenplay, turning it in within a month, but Gorin never filmed the project. The screenplay was published as Ubik: The Screenplay in 1985. According to the foreword of Ubik: The Screenplay (by Tim Powers, a friend of Dick’s and fellow science fiction writer), Dick had an idea for the film which involved “the film itself appearing to undergo a series of reversions: to black-and-white, then to the awkward jerkiness of very early movies, then to a crookedly jammed frame which proceeds to blacken, bubble and melt away, leaving only the white glare of the projection bulb, which in turn deteriorates to leave the theater in darkness, and might almost leave the moviegoer wondering what sort of dilapidated, antique jalopy he’ll find his car-keys fitting when he goes outside”.
Revised Space Rock circuit sketch
Installation ideas
Some further sketches for presenting the Space Rocks.
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