Raspberry pi + drum pad + loop station
Welcome to my repo for the ultimate Raspberry pi + drum pad + loop station.
For updates on the build log see the wiki.
For a demo, see the video.
To install puredata: sudo apt-get install puredata. PD version used: 0.51-1.
No extensions are required.
In order to get the soundcard working and avoiding theALSA input error (snd_pcm_open): No such file or directory
error, you need to make sure that the USB-soundcard is the only audio device and has index 0. Disable the Pi’s jack input via this file: /etc/modprobe.d/alsa-blacklist.conf and add the following line: blacklist snd_bcm2835.
Then, reconfigure the index of audio devices: /lib/modprobe.d/aliases.conf and change the index of options snd-usb-audio index=0.
Check if the only audio device is the USB-soundcard through cat /proc/asound/cards, which should give the index 0 to the soundcard.
Finally, change the /etc/security/limits.conf, by adding these lines to the end of the file:
@audio - rtprio 99@audio - memlock unlimited
This should solve the priority errors.
The Python code is based on Python3.
Make sure you have installed the packages to work with GPIO pins:sudo apt-get install python-rpi.gpio
You’ll need a couple of python libraries:
You’ll need to wire up the GPIO pins to the correct pin numbers, which are coded in Button_pad.py. I followed this guide.
I used an I2C driver by DenisFromHR.
I added a couple drum sounds. You can add additional .wav files following the number sintax in the folder.