Audio RotaryKnobVolume

Rotary knob for volume control (Drehknopf für Lautstärke)

Taken from the Phoniebox@GitHub issues forum

• Tested with this rotary know hardware
• Three files in the repo are dedicated to this feature:
  • RPi-Jukebox-RFID/scripts/rotary-encoder.py
  • RPi-Jukebox-RFID/scripts/ky040.py
  • RPi-Jukebox-RFID/misc/sampleconfigs/phoniebox-rotary-encoder.service.sample

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  |------)----)----------| GPIO 13       |
  |               |      |    |          |               |
  |           +   |------)----)----------| 3.3V          |
  |               |      |    |          |               |
  |           GND |------)----)----------| GND           |
  |               |      |    |          |               |
  '---------------'      |    |          '---------------'
       KY-040            |    |              Raspberry
                         |    |
                        ---  ---
                  100nF ---  --- 100nF
                         |    |
                         |    |
                         |    |
                        ===  ===
                        GND  GND

Once you've got the hardware done, install the scripts the following way:

sudo cp /home/pi/RPi-Jukebox-RFID/misc/sampleconfigs/phoniebox-rotary-encoder.service.stretch-default.sample /etc/systemd/system/phoniebox-rotary-encoder.service 
sudo chown root:root /etc/systemd/system/phoniebox-rotary-encoder.service
sudo chmod 644 /etc/systemd/system/phoniebox-rotary-encoder.service
# enable the services needed
sudo systemctl enable phoniebox-rotary-encoder
sudo reboot

sudo chmod +x /home/pi/RPi-Jukebox-RFID/scripts/rotary-encoder.py
sudo reboot 

The reboot is needed to enable the service and start it.

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.

If you want to have the Button on the knop as the fuction Halt/Play (Pause) you have to do as follow:

1. Open the folder scripts and in it the data rotary-encoder.py
2. Change these lines from

def switchPreessed(): check call ......

to

def switchPreessed():

check_call("./scripts/playout_controls.sh -c=playerpause", shell=True)

In the last days the rotary script was change to an option with to rotary encoders. So you have to add the funktion to one of knops / GPIOs

Under if name == "main":

you have to add SWITCHPIN = 13