Audio RotaryKnobVolume

Rotary knob for volume control (Drehknopf für Lautstärke)

Taken from the Phoniebox@GitHub issues forum

Tested with this rotary know hardware
One file in the repo is dedicated to this feature:
- RPi-Jukebox-RFID/components/gpio_control/GPIODevices/rotary_encoder.py
See below in this document for info on how to change the direction of the rotary knob

Circuit diagram

(capacitors are optionally)

Tested version: Used 3.3V Pin on Raspberry Pi. Connected everything without Capacitors.

  .---------------.                      .---------------.
  |               |                      |               |
  |           CLK |------o---------------| GPIO 5        |
  |               |      |               |               |
  |           DT  |------)----o----------| GPIO 6        |
  |               |      |    |          |               |
  |           SW  |      |    |          |               |
  |               |      |    |          |               |
  |           +   |------)----)----------| 3.3V          |
  |               |      |    |          |               |
  |           GND |------)----)----------| GND           |
  |               |      |    |          |               |
  '---------------'      |    |          '---------------'
       KY-040            |    |              Raspberry
                         |    |
                        ---  ---
                  100nF ---  --- 100nF
                         |    |
                         |    |
                         |    |
                        ===  ===
                        GND  GND

Once you've got the hardware done, start the configuration:

You need to edit settings/gpio_buttons.ini.

Example configurations for rotary encoder can be found at:

After editing the config file, restart the service: sudo systemctl restart phoniebox-gpio-control

The scripts now also provide support for a second knob to navigate through the tracks of a folder. Please not that you may use the switch also for other functionality. See the pin out page for details.

Changing the rotary direction

If you want to swap clockwise and counter clockwise, you can edit the code. This is the original:

def rotaryChangeCWVol(steps):
    check_call("./scripts/playout_controls.sh -c=**volumeup** -v="+str(steps), shell=True)
def rotaryChangeCCWVol(steps):
    check_call("./scripts/playout_controls.sh -c=**volumedown** -v="+str(steps), shell=True)

And this is the version with the behaviour in the opposite direction:

def rotaryChangeCWVol(steps):
    check_call("./scripts/playout_controls.sh -c=**volumedown** -v="+str(steps), shell=True)
def rotaryChangeCCWVol(steps):
    check_call("./scripts/playout_controls.sh -c=**volumeup** -v="+str(steps), shell=True)

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Code: https://github.com/MiczFlor/RPi-Jukebox-RFID
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Phoniebox is a contactless jukebox for the Raspberry Pi, playing audio files, playlists, podcasts, web streams and spotify triggered by RFID cards. All plug and play via USB, no soldering iron needed. Update: if you must, it now also features a howto for adding GPIO buttons controls.

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