Rnbo & Raspberry Pi Keyboard

Also, if there is an example somewhere of a script allowing preset selection using a keyboard connected to the rPi, I'd be curious to study it.
Thanks.

Hello JEAN-FRANCOIS,

For the automatic execution of a script at startup (one of several possibilities):

Step 1: configure your Pi to automatically log is as a certain (let's say the user is pi)

Step 2: in the console/terminal go to the home folder of user pi: cd /home/pi

Step 3: list all files in the directory including the hidden files that start with a dot (.): ls -la
and look if there is a .bashrc file (it should be)

Step 4: open the file .bashrc (vi/vim/nano ar any other texteditor: e.g: nano .bashrc) and add there command you use to run the script at the end.

The .bashrc file is automatically executed when a user opens a terminal session. it is used to to configure the bash for that account and can be used of other things as well that need to be loaded on a session start.

Just be aware if you do it this way, each bash session will start a new thread running that script. so if you want to login on ssh for example to work on your Pi, you'll have to quit the thread.

As for reading keyboard input: you would need to read the keyboard input in your script and send the value by OSC to a param of the rnbo-runner. The information/documentation is a bit scattered throughout the rnbo webpages.

Here are some possible starting points:

https://rnbo.cycling74.com/learn/rnbo-raspberry-pi-oscquery-runner

https://rnbo.cycling74.com/learn/working-with-photoresistors-ldrs-on-the-raspberry-pi-with-rnbo

the last article shows how to send OSC messages to the rnbo-runner locally, you would need to modify the script to read/send keyboard input instead of GPIO pins

the OSC command for preset loading should be

/rnbo/inst/0/presets/load <numeric-preset-index>

Jan, thanks for this. Very useful information & details.

IIRC, presets are loaded by name:

/rnbo/inst/0/presets/load <preset-name>

If you look in the http JSON response, you should see the description:

                    "load":{
                      "FULL_PATH":"/rnbo/inst/0/presets/load",
                      "TYPE":"s",
                      "VALUE":"",
                      "ACCESS":2,
                      "CLIPMODE":"none",
                      "DESCRIPTION":"Load a preset with the given name"
                    },

We use "systemd" to automatically run the oscquery runner and a few other services on the pi.

Here is a link to the service file we use: https://github.com/Cycling74/rnbo.oscquery.runner/blob/main/config/rnbooscquery.service.usr

You could consider adapting something like that, pointing at your script, for setting up your keyboard forwarding service.

Thanks Alex for the precisions. I saw that the runner was not started in .bashrc, and was going to ask how it was started. Good to know it is systemd.

Thanks again for the help. I'm getting somewhere. I can modify RNBO params with keys pressed on my computer when I'm ssh-ing the rPi. I can also launch the script with .bashrc (just added the line python + script name at the end).
Now, I don't know how to make it work with the rPi keyboard. When I stop ssh and restart the rPi, the keys pressed on the rPi keyboard don't work.
Let me know if you have any pointer. Here is the kind of python code I use:

import tty, sys, termios
import liblo as OSC
import sys

try:
  target = OSC.Address(1234)
except OSC.AddressError as err:
  sys.exit()

filedescriptors = termios.tcgetattr(sys.stdin)
tty.setcbreak(sys.stdin)
x = 0

try:
  while True:
    x=sys.stdin.read(1)[0]

if x == "r":
      print("key r pressed")
      OSC.send(target, "/rnbo/inst/0/params/mod/normalized", 0.5)
    if x == "w":
      print("key w pressed")
      OSC.send(target, "/rnbo/inst/0/params/mod/normalized", 0.)

# back to cooked mode
except KeyboardInterrupt:
  termios.tcsetattr(sys.stdin, termios.TCSADRAIN, filedescriptors)

Hmm... Maybe the .bashrc is not executed at rPi start, actually, but only when I open a shell window (ssh in my case). Will investigate...