My Bastl microGranny 2.5 kit arrived. The assembly looks very challenging.
I succeeded in installing Pure Data (Pd) on my RasPi 3 and I’ve been playing with Automatonism 1.1. It works great and even got my Novation Circuit to work with it! Automatonism is a virtual modular audio system. It’s the successor of XODULAR (both systems have been written by Johan Eriksson). Automatonism is a great way to learn both Pd and audio synthesis.
While fiddling with Pd I figured our that I can use it to write a midi CC modulator/translator which will change the CCs Novation Circuit sends over midi into CCs which the microGranny understands. The Circuit synths CC values can be automated using the inbuilt sequencer. The combination should make for very interesting results. Much like some Elektron sequencers with parameter locks. I guess I could run a Raspberry Pi Nano which only works as a Pd midi CC modulator/translator: ctlin (isolate CC) -> values -> ctlout (to desired CC). Or something.
I’ll try to learn Pd by making a midi clock input for Automatonism. Also discovered the Piz MIDI plugin collection which seems very useful. The plugins have been updated earlier this year. By the looks of it midiForceToKey can be used to make microtonal stuff.
A great resource for learning about granular synthesis.
Also found Automatonism by Johan Eriksson a modular audio environment which works inside pd. Wonder if it can run on RasPi?
Judging from Erikssons example it appears that nowadays electronic artist have make their own soft-/ hardware to market/facilitate/fund their creative careers. Mark Verbos in another excellent example (see his interview for details). Artists build their income by creating and sharing tools/instruments they use to make their art. This means that tools are currently more significant then artworks.
Maisie Williams in 2016.
[…] we should stop calling feminists ‘feminists’ and just start calling people who aren’t feminist ‘sexist’ – and then everyone else is just a human. You are either a normal person or a sexist
Notes to self: Hammeradio operates with scheduled scripts. Access schedules with
crontab -e, look for scripts in /home/pi/Desktop/. The entry
@reboot /home/pi/Desktop/startupfm.sh launches
sudo arecord -fS16_LE -r 22050 -Dplughw:1,0 -c 1 - | sudo /home/pi/PiFmRds/src/pi_fm_rds -audio - -rt Hammeradio & on startup. PiFmRds begins broadcasting at 107.9 MHz. The contab entry
0 */4 * * * /home/pi/Desktop/akustamatashutdown.sh waits for four hours before it runs the script (
sudo shutdown). With
top you can see active processes. PiFmRds shows ~24.5% CPU and arecord ~4.6%.
vcgencmd measure_temp shows a steady 49.4°C temperature.
Making the “Hammeradio” launch FM broadcast by scheduling tasks with cron.
@reboot /home/pi/Desktop/startupfm.sh works well. It launches
sudo arecord -fS16_LE -r 22050 -Dplughw:1,0 -c 1 - | sudo /home/pi/PiFmRds/src/pi_fm_rds -audio - -rt Hammeradio & I’ll also schedule a daily power off cycle for the device. I’ll set it to work during gallery open hours 14:00 to 18:00 (with a Lunch break in the middle). Found an old amplifier circuit I build (while learning to solder to make the WSG) and I’ll test it with the piezo mic I have handy (It would save the iRig pre-amp I bought).
I got PiFmRds to work on my RasPi3.
Note to self:
1. Use Etcher to flash Raspbian.
2. Enable ssh in RasPi using Terminal
3. Boot RasPi3, login via ssh
4. Set new password
5. Set locale
6. Install sndfile library
sudo apt-get install libsndfile1-dev
7. Install PiFmRds
git clone https://github.com/ChristopheJacquet/PiFmRds.git
8. Broadcast from usb audio in at 107.9FM in mono 22050
sudo arecord -fS16_LE -r 22050 -Dplughw:1,0 -c 1 - | sudo ./pi_fm_rds -audio - -rt Hammeradio
9. End broadcast
sudo pkill pi_fm_rds
Fiddled with PiFmRds settings (I want it to display Hammeradio as radiotext (RT) but I’m not sure if it’s working). I also want to run a .sh script on boot to launch pi_fm_rds broadcast (aka. step 8). Currently launching the pi_fm_rds from
/etc/rc.local. Tomorrow I’ll try to build a cron startup schedule so that I can spare the Hammeradio preamp from excess stress by powering the system down on gallery off hours (I have to use a preamp to connect a piezo mic to the RasPi). Other useful resources for future tightvnc manual.
Installed Sea Change: In the Scale of a Horse (2017) by Otto Karvonen feat Trans-Horse installation at Vuotalo. The installation consists of a performance documentation, a custom horse blanket with an embroidery with the text “Helsingin kaupunki – Kaupunkimittausyksikkö” and horse-gear used by Toivottu Poika during our HKI-TKU-HKI riding trip in 2014.
Apparently pifm which I tested last year only works in RasPi2 and I’m now trying to get RpiTx to stream FM trough USB audio in (I bet that for what I need it would be easier to buy a RasPi2). RpiTx is very advanced but I can only get it to broadcast audio files over fm (here is a simple tutorial). Unfortunately I can’t get it to stream live audio trough my USB audio interface. Following rpitx-app-note‘s I learned about:
arecord -c1 -r48000 -D plughw:CARD=Device,DEV=0 -fS16_LE - | csdr convert_i16_f | csdr dsb_fc | csdr bandpass_fir_fft_cc 0 0.1 0.01 | csdr gain_ff 2.0 | csdr shift_addition_cc 0.2 | sudo rpitx -i- -m IQFLOAT -f 100000
But it is dependent on libcsdr, which I can’t get to compile on RasPi3 because “If you compile on ARM, please edit the Makefile and tailor PARAMS_NEON for your CPU.” and I have no idea on the RasPi3 PARAMS. I found some hints on what to do (but it seems that those are set for RasPi2). Trying to sort the things out by installing gnuradio and other tools as recommended in a different tutorial.
I’ll make yet another clean install of Raspbian and continue in the evening with PiFmRds. I’m using Etcher to write the os on the sd card, which seems to work well. I should learn how to clone the sd card.
Visited Lovi ambient event at Lava klubi and saw a good gig by Rasmus Hedlund and Paula Lehtonen. Their collaboration yelds great results. Paula designed video using material from their trip to Tasmania and Rasmus crafted a field of sounds consisting of oceanic & low jungle rumble tones. Spotted a Make Noise Photogene in use. The gig was constructed out of some 8-10 distinct soundscapes, which were supported by videos from different locations.
We met with the “In the Flow” reading circle last evening. Quotes to remember: “…Russian avant-garde art was not directed against the status quo, against the dominating political and economic power structures. The Russian avant-garde of the Soviet period was not critical but affirmative…” Groys on postrevolutionary art in Russia and “Only dull and impotent artists screen their work with sincerity. In art there is a need for truth, not sincerity.” by Kazimir Malevich.
I’ve wasted another day working on the Weird Sound Generator. Replaced every capacitor, added ribbon pins to the wires and resoldered them on board. Double checked the resistor values and pulled out some resistors for testing. Eventually replaced the CD40106 chip.. This returned the voice B Osc.2 but voice A Osc.2 is still missing. I had two chips to begin with and I might have damaged both. During the resoldering session I noticed that a capacitor had been missing a connection from the beginning (because the double sided circuit board I’ve etched is missing connections between sides) and I might have short circuited both chips at some point. I’ll acquire a new chip at some point but I’ll start working on the case now. Working on the board is addictive.
Contacted the Theatre Academy of Helsinki concerning our “Horse and Performance” course which is planned for next fall. They seem excited about our course and apparently students are eager to join register.
Idea: Attach a piezo mic (with a preamp) to hammer and broadcast the audio through the Raspberry Pi radio transmitter (on FM 99.0).
Put my Raspberry Pi to use and have it running as an FM radio broadcaster. I call it “Radio 99%” (Broadcasting at 99.0 FM). Went through various tutorials and ended up following Md. Khairul Alams “Raspberry Pi Based Wireless FM Microphone” which enables me to hook a 3,5mm jack to the RasPi (Through a cheap LogiLink sound card dongle). “Radio 99%” runs a full version of Raspbian which loads PiFM on boot. I placed RasPi, battery, antenna and the sound card in a small portable box. It fits a backpack easily. I now have an intrusive FM-PA sound system! It can reach ~20m easily without any interference and works ok in a four room flat.
Wonder how difficult it would be to broadcast on all FM frequencies at once? To change the broadcast frequency I have to connect to RasPi using SSH, change the startup script and reboot the device. This is not a convenient way to work with it. On an other SD card I installed the Raspberry Pirate Radio offered by Makezine, which is tied to a custom Raspbian distro. It works too and works as a jukebox.
Wonder if people in the middle ages told stories about the stone age? Like we tell stories about the middle ages.