bensinober / clanman

All-in-one Midi patchbox and software for the go

the ClanMan

An all-in-one midi device kit powered by Raspberry Pi

Experimental WIP project warning

Features:

• Raspberry Pi with PatchboxOS for real-time audio and midi setup
• Button panel to handle functions, instrument selections, effects, etc.
• Rotary switch to allow modifying
• OLED display

Pinout

TODO: draw wiring diagram

OLED Display

Pin  OLED Function RPi   (pin)
-------------------
1  -- GND          GND     (6)
2  -- 3VV          3VV     (1)
4  -- DC DataCmd   GPIO 25 (22)
7  -- SCLK         GPIO 11 (23) # CLK
8  -- DIN/DATA     GPIO 10 (19) # MOSI
15 -- CS ChipSel   GPIO 8  (24) # CE0
16 -- RST          GPIO 24 (18)

CONTROLLER

led := gpioreg.ByName("GPIO23")  // pin 16

BUTTONS

btnA := gpioreg.ByName("GPIO17") // pin 11
btnB := gpioreg.ByName("GPIO18") // pin 12
btnC := gpioreg.ByName("GPIO27") // pin 15
btnD := gpioreg.ByName("GPIO22") // pin 13

ROTARY

apin := gpioreg.ByName("GPIO5")  // pin 29
bpin := gpioreg.ByName("GPIO6")  // pin 31

Install

Raspberry Pi 3+ or newer with Raspbian OS

linuxsampler

linuxsampler is an API for alsa midi that supports sfz, gig and sf2 sound banks

sudo apt install libsndfile-dev libaudiofile-dev

wget https://download.linuxsampler.org/packages/libgig-4.3.0.tar.bz2
tar xvjf libgig-4.3.0.tar.bz2
cd libgig-4.3.0
./configure
make
make install

wget https://download.linuxsampler.org/packages/linuxsampler-2.2.0.tar.bz2
tar xvjf linuxsampler-2.2.0.tar.bz2
cd linuxsampler-2.2.0
./configure
make
make install


alternatives: install from deb packages: https://download.linuxsampler.org/packages/debian/

fluidsynth et al

sudo apt install fluidsynth

mindless midi connection service

sudo apt install git g++ make libasound2-dev
git clone https://github.com/mzero/amidiminder.git
cd amidiminder
make
sudo dpkg -i build/amidiminder.deb

Enable SPI

sed -i "_#dtparam=spi=on_dtparam=spi=on_" /boot/config.txt
reboot

midi rules

/etc/amidiminder.rules
amidiminder -C  # checks the rules and then quits
sudo systemctl restart amidiminder

Setup

Copy all script files into ./clanman/scripts folder, and the clanman binary to ./clanman

ln -s /home/pi/clanman/scripts/fluidsynth.service /etc/systemd/system/fluidsynth.service
ln -s /home/pi/clanman/scripts/linuxsampler.service /etc/systemd/system/linuxsampler.service
ln -s /home/pi/clanman/scripts/clanman.service /etc/systemd/system/clanman.service

systemctl enable fluidsynth.service
systemctl enable linuxsampler.service
systemctl enable clanman.service

Cross-compile tools (on HOST)

sudo apt-get install libc6-armel-cross libc6-dev-armel-cross binutils-arm-linux-gnueabi libncurses5-dev build-essential bison flex libssl-dev bc
sudo apt install gcc-arm-linux-gnueabihf

BUILD for pi:

make

copy binary to raspberry and run

Configuration

• Display

Chose SPI layout for speed, although I2C would be an easier configuration

• Buttons

4 mini pushbuttons with pulldown resistor. Debounced in software

• Rotary

Potentiometer needs some extra work for RaspberyPi since GPIO pins are digital only. Either by measuring step response in software, or by adding an analog <-> digital signal converter.