Category:LFP: Difference between revisions
Line 143: | Line 143: | ||
const unsigned char sound_data[] PROGMEM= { | const unsigned char sound_data[] PROGMEM= { | ||
You can use this script to | You can use this script to automatize the creation of sample.h: | ||
<pre> | <pre> | ||
#!/bin/sh | #!/bin/sh | ||
# Prepares a sample.h file | # Prepares a sample.h file | ||
# sed not used, should just werk (TM) everywhere | # sed not used, should just werk (TM) everywhere | ||
# Usage: | # Usage: ./samplify.sh my_sample.wav | ||
# Or you can install samplify.sh in your ~/bin and call it | # Or you can install samplify.sh in your ~/bin and call it | ||
# from anywhere you like | # from anywhere you like | ||
# Convert original soundfile and create sample.h | |||
# A temp file is needed oftherwise xxd is unable to generate | |||
# sample length information? | |||
sox "${1}" -t u8 -c 1 -r 8000 /tmp/sample.wav | |||
xxd -i /tmp/sample.wav > sample.h | |||
rm /tmp/sample.wav | |||
# Extract sample length | # Extract sample length | ||
Line 164: | Line 171: | ||
# Prepend new header to sample.h | # Prepend new header to sample.h | ||
echo "$(echo "${NEW_HEADER}"; cat sample.h)" > sample.h | echo "$(echo "${NEW_HEADER}"; cat sample.h)" > sample.h</pre> | ||
</pre> | |||
Revision as of 09:29, 17 September 2019
Low Frequency Publication
Materialising the Blackbox
Introduction
In this special issue we will explore the physicality behind slick black boxes as for example found in everyone's pockets today. Be it hardware or software. The goal is to make the interactions, interfaces and connections explicit through hands-on research and play. Informed by the fact all modern day electronics still adhere to the paradigm of modularity, like the earliest computer designs we will collaboratively build one or more devices that explore notions of modularity, complexity/simplicity, interfaces, darkpatterns, input/output while explicitly giving insight into the black box, but this time including a manual.
To encourage affection with the materiality of the blackbox we will create our own. Starting of by constructing the building blocks of a synthesizer, allowing the creation of complex outputs by interfacing/combining relatively simple operations. As a clear framework we will start off by working with sound, your fastest sensor. Compatible with the possibly familiar 'Eurorack' format (as developed by Doepfer) we will be constructing several electronic modules that allow the output of one module to be the input for the next. Expanding upon the original discrete, or analog approach, each of our modules offer a programmable interface, eventually allowing for interfacing beyond the blackbox.
As single modules perform one job and one job well, you will have to anticipate and even require the output of someone elses module in order for yours to work. Coinciding with your research we will create one or several 'outputs' consisting of an interface, electronics and a manual.
Guests
Dennis de Bel Dennis de Bel (1984, NL) is an applied artistic researcher, educator, radio amateur (call sign PD0WNED). In his practice he positions himself as producer, consumer, observer and distributor of critical knowledge focussed on technology. His work has been exhibited at Siggraph Los Angeles, Transmediale Berlin and hosted workshops in various collaborations at, for example, ISEA Hong Kong, Radical Networks New York. He participated in the Relearn summer schools and Libre Graphics Meetings besides being a guest tutor at the Design Academy Eindhoven and the Willem de Kooning Academy Rotterdam University of Applied Science. In 2017 he co-founded Varia, a Rotterdam based space for developing collective approaches towards everyday technology. De Bel holds a MA from the Piet Zwart Institute (NL) and most recently (Jul-Dec 2018) participated in the artist in residency program of the Institute for Provocation in Beijing.
Olli Aarni
de Player
Martin Howse
Schedule
The program consists of three main sections, building, interfacing and coding and going public. Bring headphones to every class!
Building
Getting your hands dirty.
Week 1 - Sept 17
Today you will become modules of a modular synth! First we need to construct them though:
Construct: Meergranen (Optionally + LFO)
PAD: https://pad.xpub.nl/p/lfp1
GIT: https://git.xpub.nl/XPUB/special-issue-x
BUILD MANUAL: File:Manual-meergranen.pdf (20MB PDF)
FIRMWARE: Arduino Firmware (ZIP file)
SOFTWARE: Arduino IDE + Driver
PLEASE BRING A MINI USB CABLE (with power + data lines) and Headphones (3.5mm jack)
HOMEWORK: Play with the various Arduino Firmware (ZIP file) found in that zip file. Note some codes might need an external trigger (control voltage, 0-5v) in order to produce sound. Other codes might only produce triggers (no sound), used to sequence/trigger other modules. Make notes on the pad above what you find interesting, what functionality you would like to have, what sounds?
Week 2 - Sept 23,24,25,28
Workshop with Olli Aarni
(also PSU?)
28th September Excursion to Dutch Modular Festival
Week 3 - 1 Oct
PSU
Week 4 - 8 Oct
Building prototype frontpanels and 'test' case
Interfacing
Basics of arduino, interfacing with others, desiging interfaces (frontpanels) SOX
Laser cutter instructions (PDF)
Frontpanel source files (vector)
Week 5 - 15 Oct
Workshop with Olli Aarni (14, 15, 16) Arduino Basics
Week 6 - 5 Nov
DIWO - Interfacing with your neighbours
Week 7 - 12 Nov
Develop interactions
Publishing
Going public, manual
Week 8 - 19 Nov
Week 9 - 26 Nov
Week 10 - 3 Dec
Presentation at de Player
Resources
Software
Hardware
Modules - Mult
The simples module, just a front panel and jacks connected to each other (tip to tip, sleeve to sleeve). Creating a passive (non-powered) crude kind of mixer! Insert one signal and gets repeated 10x (each plug will reduce the signal output by half though). For audio and cv.
Modules - Arduino Tool 'Meergranen'
NOTE: there is a bug in the IDC connection, pin 7 and 8 need to be bridged if you want to power the module through usb (for testing) WARNING: the output port is UNPROTECTED agains overcurrent/voltage/reversepolarity. Use it as OUPUT and dont connect it to another output for example.
Adding custom audio samples
Download Arduino firmware examples here: Arduino Firmware (ZIP file) Indie the zip file you will find grains-sounds-master.zip, unzip and flash one of the arduino sketches found in the 'patches' folder. Grains-sounds is a basic sample player that allows you to manipulate pitch, start and end of a sample (using the potentiometers or control voltage). To add your own samples, just replace the 'sample.h' file with one of your own. To prepare an audio sample for this firmware:
-install sox, sed and Audacity (mac: install homebrew and then install brew install sox sed) -make 3 second (loop) of a sound in Audacity for example -convert stereo sound to mono -export as wav file (8bit, 8000hz sample rate ) see screenshot:
-in Terminal, navigate yo your exported soundfile and:
sox your_sound_file.wav -t u8 -c 1 -r 8000 output.wav xxd -i out.wav > sample.h
you end up with a hexidecimal encoded soundfile now in an array.
C code needs to know the lenght of the array before hand:
at the bottom of sample.h it says the length of the file,
for exmaple 27278.
in sample.h search and replace the first line:
unsigned char out2_wav[] = {
with, note you have to change the sound_lenght into that of your sample:
#define SAMPLE_RATE 8000 const int sound_length=27278; const unsigned char sound_data[] PROGMEM= {
You can use this script to automatize the creation of sample.h:
#!/bin/sh # Prepares a sample.h file # sed not used, should just werk (TM) everywhere # Usage: ./samplify.sh my_sample.wav # Or you can install samplify.sh in your ~/bin and call it # from anywhere you like # Convert original soundfile and create sample.h # A temp file is needed oftherwise xxd is unable to generate # sample length information? sox "${1}" -t u8 -c 1 -r 8000 /tmp/sample.wav xxd -i /tmp/sample.wav > sample.h rm /tmp/sample.wav # Extract sample length SAMPLE_LEN=$(tail -1 sample.h | cut -d ' ' -f 5 | tr -d ';') # Inject SAMPLE_LEN in new file header NEW_HEADER="#define SAMPLE_RATE 8000 const int sound_length=${SAMPLE_LEN}; const unsigned char sound_data[] PROGMEM= {" # Remove first line of sample.h echo "$(tail -n +2 sample.h)" > sample.h # Prepend new header to sample.h echo "$(echo "${NEW_HEADER}"; cat sample.h)" > sample.h
Pro tip: 27278 bytes is about the maximum lenght of sample storage on
arduino nano (+ the script that plays the sample). If sound sample
is a bit too long/big you can simply speed it up in Audacity, the
script allows for pitch bending, so you can make up for the increase in speed.
Possiblt there is some head room in the sample rate (8000hz) in the above
example. Reducing this will result in smaller file, but lower quality (resolution).
Possibly the playback speed will increase as well (since the script anticipates the
sample rate of 8000hz, ofcourse this is adjustable by yourself).
Bill of Materials
Label | Part Type | Properties |
---|---|---|
for arduino | Male Headers | 1x16 |
for arduino | Female Headers | 1x16 |
C1 104 | Capacitor | 104, 100nF package cap-pth-small2; variant pth2 |
J1 - A2 | 3.5mm Switch Jack | size 3.5mm; variant 1; part # PJ301M-12 |
J2 - A1 | 3.5mm Switch Jack | size 3.5mm; variant 1; part # PJ301M-12 |
J3TRIG - A3 | 3.5mm Switch Jack | size 3.5mm; variant 1; part # PJ301M-12 |
J4 - A0 | 3.5mm Switch Jack | size 3.5mm; variant 1; part # PJ301M-12 |
J4 OUT | 3.5mm Switch Jack | size 3.5mm; variant 1; part # PJ301M-12 |
JP | Header 5x2 | package 2x5-ra; variant ra |
LDR1 | Photocell (LDR) | resistance@ dark 300 kOhms@ 10 seconds; package THT; resistance@ luminance 16 kOhms@ 10 lux |
LDR2 | Photocell (LDR) | resistance@ dark 300 kOhms@ 10 seconds; package THT; resistance@ luminance 16 kOhms@ 10 lux |
LDR3 | Photocell (LDR) | resistance@ dark 300 kOhms@ 10 seconds; package THT; resistance@ luminance 16 kOhms@ 10 lux |
LDR4 | Photocell (LDR) | resistance@ dark 300 kOhms@ 10 seconds; package THT; resistance@ luminance 16 kOhms@ 10 lux |
LED1 | Red (633nm) LED | package 3 mm [THT]; color Red (633nm); leg yes |
LED2 | Red (633nm) LED | package 3 mm [THT]; color Red (633nm); leg yes |
LED3 | Red (633nm) LED | package 3 mm [THT]; color Red (633nm); leg yes |
LED4 | Red (633nm) LED | package 3 mm [THT]; color Red (633nm); leg yes |
NANO | Arduino Nano (Rev3.0) | type Arduino Nano (3.0) |
P1 = A2 | Rotary Potentiometer (Small) | package THT; size Rotary - 9mm; track Linear; maximum resistance 10kΩ; type Rotary Shaft Potentiometer |
P2 = A1 | Rotary Potentiometer (Small) | package THT; size Rotary - 9mm; track Linear; maximum resistance 10kΩ; type Rotary Shaft Potentiometer |
P3 = A0 | Rotary Potentiometer (Small) | package THT; size Rotary - 9mm; track Linear; maximum resistance 10kΩ; type Rotary Shaft Potentiometer |
R1 | 0Ω Resistor | bands 5; package THT; tolerance ±5%; pin spacing 400 mil; resistance 0Ω |
R2 | 0Ω Resistor | bands 5; package THT; tolerance ±5%; pin spacing 400 mil; resistance 0Ω |
R3 | 1kΩ Resistor | bands 5; package THT; tolerance ±5%; pin spacing 400 mil; resistance 1kΩ |
R4 | 1kΩ Resistor | bands 5; package THT; tolerance ±5%; pin spacing 400 mil; resistance 1kΩ |
R5 | 1kΩ Resistor | bands 5; package THT; tolerance ±5%; pin spacing 400 mil; resistance 1kΩ |
R6 | 10kΩ Resistor | bands 5; package THT; tolerance ±5%; pin spacing 400 mil; resistance 10kΩ |
R7 | 1kΩ Resistor | bands 5; package THT; tolerance ±5%; pin spacing 400 mil; resistance 1kΩ |
R8 | 10kΩ Resistor | bands 5; package THT; tolerance ±5%; pin spacing 400 mil; resistance 10kΩ |
R9 | 150Ω Resistor | bands 5; package THT; tolerance ±5%; pin spacing 400 mil; resistance 150Ω |
S1 | SWITCH-MOMENTARY-2 | package tactile-pth; variant pth |
Shopping List
Amount | Part Type | Properties |
---|---|---|
2 | Male Headers | 1x16 |
2 | Female Headers | 1x16 |
1 | Capacitor | 104, 100nF package cap-pth-small2; variant pth2 |
5 | 3.5mm Switch Jack | size 3.5mm; variant 1; part # PJ301M-12 |
1 | Header 5x2 | package 2x5-ra; variant ra |
4 | Photocell (LDR) | resistance@ dark 300 kOhms@ 10 seconds; package THT; resistance@ luminance 16 kOhms@ 10 lux |
4 | Red (633nm) LED | package 3 mm [THT]; color Red (633nm); leg yes |
1 | Arduino Nano (Rev3.0) | type Arduino Nano (3.0) |
3 | Rotary Potentiometer (Small) | package THT; size Rotary - 9mm; track Linear; maximum resistance 10kΩ; type Rotary Shaft Potentiometer |
2 | 0Ω Resistor | bands 5; package THT; tolerance ±5%; pin spacing 400 mil; resistance 0Ω |
4 | 1kΩ Resistor | bands 5; package THT; tolerance ±5%; pin spacing 400 mil; resistance 1kΩ |
2 | 10kΩ Resistor | bands 5; package THT; tolerance ±5%; pin spacing 400 mil; resistance 10kΩ |
1 | 150Ω Resistor | bands 5; package THT; tolerance ±5%; pin spacing 400 mil; resistance 150Ω |
1 | SWITCH-MOMENTARY-2 | package tactile-pth; variant pth |
Modules - Low frequency oscillator
Modules - Power Supply
Modules - ESP8266wifi
Frontpanels
Vector template for the laser cutter
Cables
Flat cables with IDC connectors ('eurorack power cables') (Lint- or Bandkabel in Dutch)
Patch cable (mono TS (Tip-Sleeve)3.5mm Male Jacks)
,
Glossary
Patch Cables
Control Voltage - or CV
Breadboard - or solderless-breadboard is a plastic board with interconnected holes for prototyping electronic circuits using jumper cables instead of (semi) permanent solder.
Soldering Tin - combination of low melting point metals and resin flux. Sticks to copper, various metals and itself (not to aluminium, stainless steel, plastic, wood etc.)
PCB - Printed Circuit Board - Fiberglass (FR4) coated with copper. Etching away the copper allows for creating traces for electrical circuits. Professionally made boards are silskreened with soldermask (only exposing the places where solder is allowed and protecting the fragile copper traces + lettering for component placement.
Resistor - Slows down electrons, reducing current and thus voltage (Ohms Law, U=IxR) by converting it to heat. Units in Ohms > 1k = 1 kilo Ohm = 1000 Ohm, 0r = 0 Ohm (can be used to bride traces on a PCB)
LED - Light emitting diode, Has polarity: a positive (anode) and negative (cathode) leg. The longest leg is the positive one, keep this in mind when placing the component!
LDR - Light Dependant Resistor, a variable resitor based on light. The more light the lower the resistance and vice versa. Also called light sensor. Units in Ohms
Potentiometer - Rotary or sliding (like on audio mixers) variable resistor. Resistance is changed by turning the knob. Units in Ohms
Ceramic Capacitor - No polarity. Stores enegry until full and then releases it (like a bucket). Can be used for filtering signals (high frequencies will chose to go over a capacitor, low frequencies rather choose to go through a resistor). Units in Farad (pico, nano)
Electrolytic Capacitor - Has polarity. Stores enegry until full and then releases it (like a bucket). (high frequencies will chose to go over a capacitor, low frequencies rather choose to go through a resistor)Units in Farad (mirco, milli)
IDC Connector - Special 'solderless' connectors for ribbon cable, press fit. Use vice, not hammer, be gentle on the brittle material.
Heatshrink - Tube that shrinks when heat is applied (use: lighter, paintstripper, soldering iron), handy for isolating wires, contacts and blocking external light when using LDRS
Ribbon cable - Also called flat cable, multiple parallel conducting wires. (Dutch: lint- or bandkabel)
Vactrols - Vactrols turn voltage into resistance. The 'hotter' the signal, the lower the resistance. Consist of one LED and one LDR, applying voltage to the LED creates light, influencing the resistance of the LDR.
Shops
Up until a few years ago it was not strange to bike a few minutes to a nearby electronics shop to buy a headphone jack input socket or battery holder. In 2015 the last electronics (component) shop of Rotterdam closed (DIL). Many preceded (2014 Van Der Bend) and many followed, leaving us with just a handful of physical shops to get (unwanted) advice and goods at a premium price without waiting for yellow envelopes from China. Besides not being able to physically examine the goods for sale (will it fit?) more important issues arise. Beyond supporting your local entrepreneur, the decline of DIY shops like the above signify a certain level of consumerism, painfully acknowledging planned obsolesce over DIY repair culture.
Local Shops
https://www.radiotwenthe.nl/ The Hague
https://www.hf-electronics.nl/ Haarlem
https://www.baco-army-goods.nl/ Ijmuiden
http://www.radiopiet.nl/ Arnhem
https://www.tinytronics.nl/ Eindhoven, semi public shop, sells Chinese knock-offs at a premium..
https://www.hobbyelectronica.nl/ Online only, quick delivery, expensive-ish
https://www.kiwi-electronics.nl/ Online only, quick delivery, expensive, recently burned down, sells adafruit stuff etc (expensive-ish)
European Shops
https://www.tme.eu/nl/en/ Member of the Shenzhen (China) Chamber of Commerce. That says everything, please forget box pushers like conrad, farnell, digikey who will rip you off
China
(Almost) EVERYTHING mentioned above comes from Shenzhen, China...so aliexpress.com (or taobao....good luck!). It even pays of to fly to HK, get a SZ port visa and buy what you need in case you want bulk items.
Pads
Reading/Watching/Listening List
http://www.gieskes.nl/ databending circuitboard designs, owns his own pick and place machine, music on tape, vinyl, concrete and what not.
https://www.ciat-lonbarde.net/ taking modular synths in some direction
http://www.gjp.info/ originally radio amateur drummer, applying knowledge of electronics to make incredible noise
http://www.electronicpeasant.com/ discovered by accident, but most 'personal homepages' of early synth enthusiast will publish in this manner
https://www.mengqimusic.com/ friend from Beijing offers some nice interfaces
https://www.errorinstruments.com/ your local eurorack pusher, love bbq in Shenzhen, has infinite energy to make some seriously interesting devices
https://www.muffwiggler.com/forum/index.php the forum where all the action takes (took?) place. Terrible name, terrible place, all the goods you need, though scattered over 90+ forum pages, enjoy!
Pages in category "LFP"
The following 22 pages are in this category, out of 22 total.
E
Media in category "LFP"
The following 170 files are in this category, out of 170 total.
- 20190928 150755 copy.jpg 1,547 × 2,268; 2.43 MB
- 20191022 214700.jpg 2,268 × 1,276; 1.76 MB
- 20191030 140218.jpg 2,268 × 1,276; 1.95 MB
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- 20191205 164856.jpg 1,116 × 1,984; 1.13 MB
- 20191215 144305.jpg 2,268 × 1,276; 1.62 MB
- 20200220 171912.jpg 1,701 × 957; 750 KB
- 7 manual.jpg 800 × 794; 498 KB
- 777.jpg 1,000 × 767; 350 KB
- 7tv.jpg 1,595 × 1,181; 1.15 MB
- Additive synthesis.jpg 650 × 137; 8 KB
- Alien.jpg 720 × 540; 705 KB
- Ardiono.jpg 3,264 × 1,836; 1.52 MB
- Baby-drummer.jpg 720 × 540; 704 KB
- Begena.jpg 266 × 421; 37 KB
- Bibi1.mp3 ; 15 KB
- Bibi2.mp3 ; 27 KB
- Caligo.mp3 ; 52 KB
- Catdogmouse.gif 640 × 400; 451 KB
- Clap&grime.mp3 ; 90 KB
- Clpngmusic.jpg 600 × 308; 81 KB
- Compressor.gif 244 × 140; 1.33 MB
- Dagger.jpg 960 × 714; 227 KB
- Democratic composition.jpg 868 × 1,280; 51 KB
- Digital oscilloscope.gif 400 × 225; 3.1 MB
- Distraction manager pcb.JPG 375 × 426; 34 KB
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- Dmf trailer.jpg 1,280 × 960; 70 KB
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- DP2.jpeg 1,000 × 667; 637 KB
- Final Glare.jpg 540 × 960; 130 KB
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- Frontpanel1.jpg 1,457 × 766; 327 KB
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- Love-tape.jpg 720 × 540; 695 KB
- Mark - Back.png 1,789 × 1,743; 1.78 MB
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- Max DMF1.jpg 1,836 × 3,264; 1.62 MB
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- Max DMF5.gif 480 × 640; 4.01 MB
- Max DMF6.jpg 3,264 × 1,836; 2.29 MB
- Max DMF7.gif 480 × 640; 2.45 MB
- Max DMF8.jpg 3,264 × 1,836; 2.09 MB
- Maxbreadboard1.jpg 2,268 × 1,276; 601 KB
- Maxconceptsketch1.jpg 1,134 × 2,016; 414 KB
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- Meergranen s.gif 453 × 958; 351 KB
- Meergranen-db.jpg 4,000 × 3,000; 4.07 MB
- Meergranen-samples.png 1,548 × 878; 527 KB
- Meergranen1.jpg 3,264 × 2,448; 1.95 MB
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- Modular synth interface.jpg 2,268 × 1,515; 2.37 MB
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- Musicboxmodule.jpg 2,268 × 1,276; 2.03 MB
- MVDH speech-to-midi-counting.mp3 ; 351 KB
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- Raspberry-p-3-bird.jpg 726 × 498; 249 KB
- S-Water.mp3 ; 843 KB
- S-Wood.mp3 ; 1.1 MB
- Screen Shot 2019-12-02 at 22.20.11.png 170 × 390; 14 KB
- Sensor plug.jpg 1,390 × 2,472; 675 KB
- Sensor synth.jpg 1,836 × 3,264; 856 KB
- Sensor.png 265 × 893; 10 KB
- SensorProto.jpg 1,836 × 3,264; 836 KB
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- Serial plotter.mp4 ; 2.47 MB
- Sess3 2.gif 480 × 640; 1.39 MB
- Sess3 5.jpg 1,836 × 3,264; 1.51 MB
- Sine.mp3 ; 48 KB
- Sine2.mp3 ; 119 KB
- Speech-instrument.jpg 1,417 × 823; 592 KB
- Stapletrigger2.jpg 3,264 × 1,836; 1.56 MB
- Stapletrigger3.jpg 1,836 × 3,264; 1.7 MB
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- Tisa take time.mp3 ; 6 MB
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- XPUB - DE PLAYER - INPUT-OUTPUT176-12 december 2019.jpg 1,800 × 1,200; 559 KB
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- XPUB - DE PLAYER - INPUT-OUTPUT43-12 december 2019.jpg 1,800 × 1,200; 610 KB
- XPUB workshop.jpg 4,128 × 2,322; 2.75 MB