| 19 | | === Adafruit Volume control === |
| 20 | | I am controlling the volume of the MAX9744 using the CircuitPython Libraries (see [https://learn.adafruit.com/circuitpython-on-raspberrypi-linux/installing-circuitpython-on-raspberry-pi] ). |
| 21 | | The things that I had to do: |
| 22 | | ==== Install the library ==== |
| 23 | | while in (.venv) |
| 24 | | * pip3 install RPI.GPIO |
| 25 | | * pip3 install adafruit-blinka |
| 26 | | ==== Enable I2C === |
| 27 | | I2C is not enabled by default so run and enable I2C in the Interfacing Options |
| 28 | | ==== Python script ==== |
| 29 | | Use this script to set the initial volume to about the half (the range is 0 to 63). Create ~/bin/ada_volume.py with the following content |
| 30 | | * nano ~/bin/ada_volume.py |
| 31 | | {{{ |
| 32 | | import board |
| 33 | | import busio |
| 34 | | import adafruit_max9744 |
| 35 | | i2c = busio.I2C(board.SCL, board.SDA) |
| 36 | | amp = adafruit_max9744.MAX9744(i2c) |
| 37 | | amp.volume = 30 |
| 38 | | }}} |
| 39 | | ==== Start using systemd ==== |
| 40 | | Place a service file in the user directory: |
| 41 | | * nano ~/.config/systemd/user/myadavolume.service |
| 42 | | with the content |
| 43 | | {{{ |
| 44 | | [Unit] |
| 45 | | Description=set adafruit volume |
| 46 | | After=network.target |
| 47 | | |
| 48 | | [Service] |
| 49 | | Type=simple |
| 50 | | ExecStart=/home/pi/mycroft-core/.venv/bin/python /home/pi/bin/ada_volume.py |
| 51 | | |
| 52 | | [Install] |
| 53 | | WantedBy=default.target |
| 54 | | }}} |
| 55 | | Enable and start it: |
| 56 | | * systemctl --user daemon-reload |
| 57 | | * systemctl --user enable myadavolume |
| 58 | | * systemctl --user start myadavolume |
| 59 | | |
| 60 | | === Pulseaudio === |
| 61 | | The picroft installation does not use pulseaudio for the output of voice and other sound so the general volume control did not work |
| 62 | | ==== blacklist the internal bcm2835 sound card ==== |
| 63 | | This is for sure totally optional but I did it |
| 64 | | * sudo nano /etc/modprobe.d/alsa-blacklist.conf |
| 65 | | {{{ |
| 66 | | blacklist snd_bcm2835 |
| 67 | | }}} |
| 68 | | ==== force ALSA userspace to use PulseAudio ==== |
| 69 | | * sudo nano /etc/asound.conf |
| 70 | | {{{ |
| 71 | | # Use PulseAudio by default |
| 72 | | pcm.!default { |
| 73 | | type pulse |
| 74 | | fallback "sysdefault" |
| 75 | | hint { |
| 76 | | show on |
| 77 | | description "Default ALSA Output (currently PulseAudio Sound Server)" |
| 78 | | } |
| 79 | | } |
| 80 | | |
| 81 | | ctl.!default { |
| 82 | | type pulse |
| 83 | | fallback "sysdefault" |
| 84 | | } |
| 85 | | }}} |
| 86 | | ==== mycroft conf ==== |
| 87 | | * sudo nano /etc/mycroft/mycroft.conf |
| 88 | | replace: |
| 89 | | {{{ |
| 90 | | "play_wav_cmdline": "aplay -Dplughw:ArrayUAC10,0 %1", |
| 91 | | "play_mp3_cmdline": "mpg123 -a plughw:ArrayUAC10,0 %1", |
| 92 | | }}} |
| 93 | | with |
| 94 | | {{{ |
| 95 | | "play_wav_cmdline": "paplay %1", |
| 96 | | "play_mp3_cmdline": "mpg123 %1", |
| 97 | | }}} |
| 98 | | ==== additional setting in default.pa ==== |
| 99 | | This enables ducking and is a nice feature that the volume of music playing is turned down while Mycroft speaks instead of stopping the output. |
| 100 | | * sudo nano /etc/pulse/default.pa |
| 101 | | add to the end of the file |
| 102 | | {{{ |
| 103 | | unload-module module-suspend-on-idle |
| 104 | | unload-module module-role-cork |
| 105 | | load-module module-role-ducking |
| 106 | | }}} |
| | 19 | [wiki:mycroft_mark-2_spotify Mycroft Mark II - Spotify using Pulseaudio] |
