# bananenkeyboard

Resistive touch sensors to sound by touching the probes or things connected to them.

# Install

* Raspberry Pi OS Lite
* Release date: January 28th 2022
* System: 32-bit
* Kernel version: 5.10
* Debian version: 11 (bullseye)

Remember to activate "ssh" before booting first (touch "/boot/ssh" on the MicroSD-card)

After login (ssh) proceed with these steps:
1. `sudo apt update`
2. `sudo apt upgrade`
3. `sudo apt -y install git python3-pip libsdl2-mixer-2.0-0 usbmount screen`
4. `git clone https://repos.ctdo.de/interfisch/bananenkeyboard/`
5. `pip3 install pyserial pygame`
6. `sudo sh -c 'echo "\n[all]\nenable_uart=1\n" >>/boot/config.txt'`
7. `sudo sh -c 'sed 's/^dtoverlay=vc4-kms-v3d/dtoverlay=vc4-fkms-v3d/' -i /boot/config.txt`
8. `sudo mkdir /etc/systemd/system/systemd-udevd.service.d`
9. `sudo sh -c 'echo "[Service]\nPrivateMounts=no" >/etc/systemd/system/systemd-udevd.service.d/00-my-custom-mountflags.conf'`
10. `chmod u+x ~/bananenkeyboard/Pi/s.py`
11. `sudo sh -c 'cp /home/pi/bananenkeyboard/piconfig/rc.local /etc/rc.local'`
12. `sudo chmod u+x /etc/rc.local`
13. `chmod u+x ~/bananenkeyboard/piconfig/readonly.sh`
14. `~/bananenkeyboard/piconfig/readonly.sh`
15. `sudo gpasswd --add pi tty`
16. `sudo reboot`

By copying the rc.local (step 10), the script will be started in a `screen` after reboot.

To start it manually type:

`cd ~/bananenkeyboard/Pi`

`python3 ./s.py`



# Convert and remove silence from samples:
`for file in *.mp3; do ffmpeg -i ${file} -af silenceremove=1:0:-30dB ${file/mp3/wav} -y; done`

An open source for samples is for example: https://philharmonia.co.uk/resources/sound-samples/

# TODO
* Connect USB stick with samples which should override the default samples
* `ALSA lib pcm.c:8545:(snd_pcm_recover) underrun occurred`. Especially if using mp3s?