Changes between Initial Version and Version 1 of mycroft_mark-2_sound

Timestamp:

04/12/20 08:57:52 (6 years ago)

Author:

admin

Comment:

--

mycroft_mark-2_sound

@@ +1 @@
+=== Adafruit Volume control ===
+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] ).
+The things that I had to do: 
+==== Install the library ====
+while in (.venv)
+* pip3 install RPI.GPIO
+* pip3 install adafruit-blinka
+==== Enable I2C ===
+I2C is not enabled by default so run and enable I2C in the Interfacing Options
+==== Python script ====
+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
+* nano ~/bin/ada_volume.py
+{{{
+import board
+import busio
+import adafruit_max9744
+i2c = busio.I2C(board.SCL, board.SDA)
+amp = adafruit_max9744.MAX9744(i2c)
+amp.volume = 30
+}}}
+==== Start using systemd ====
+Place a service file in the user directory:
+* nano ~/.config/systemd/user/myadavolume.service
+with the content
+{{{
+[Unit]
+Description=set adafruit volume
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/home/pi/mycroft-core/.venv/bin/python /home/pi/bin/ada_volume.py
+
+[Install]
+WantedBy=default.target
+}}}
+Enable and start it:
+* systemctl --user daemon-reload
+* systemctl --user enable myadavolume
+* systemctl --user start myadavolume
+
+=== Pulseaudio ===
+The picroft installation does not use pulseaudio for the output of voice and other sound so the general volume control did not work
+==== blacklist the internal bcm2835 sound card ====
+This is for sure totally optional but I did it
+* sudo nano /etc/modprobe.d/alsa-blacklist.conf
+{{{
+blacklist snd_bcm2835
+}}}
+==== force ALSA userspace to use PulseAudio ====
+* sudo nano /etc/asound.conf
+{{{
+# Use PulseAudio by default
+pcm.!default {
+  type pulse
+  fallback "sysdefault"
+  hint {
+    show on
+    description "Default ALSA Output (currently PulseAudio Sound Server)"
+  }
+}
+
+ctl.!default {
+  type pulse
+  fallback "sysdefault"
+}
+}}}
+==== mycroft conf ====
+* sudo nano /etc/mycroft/mycroft.conf
+replace:
+{{{
+   "play_wav_cmdline": "aplay -Dplughw:ArrayUAC10,0 %1",
+   "play_mp3_cmdline": "mpg123 -a plughw:ArrayUAC10,0 %1",
+}}}
+with
+{{{
+   "play_wav_cmdline": "paplay %1",
+   "play_mp3_cmdline": "mpg123 %1",
+}}}
+==== additional setting in default.pa ====
+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.
+* sudo nano /etc/pulse/default.pa
+add to the end of the file
+{{{
+unload-module module-suspend-on-idle
+unload-module module-role-cork
+load-module module-role-ducking
+}}}