UltrasonicPlayer - Revision history

Bertrik Sikken: /* Status */

2019-07-21T13:39:57Z

Status

@@ Line 21: / Line 21: @@
 == Status ==
 -04-01: I have a box with the piezo speaker mounted in it. Still a bit stuck on the auto-play-on-USB-plugin stuff. First, I could just play back audio from a specific directory first.
 -10-10: basically I'm stuck on the software part, unable to decide how I should solve how to play audio files on USB stick plugin, I've got several hints but no definite solution. Getting more hints like "why *don't* you try X" are confusing the issue more. Also a bit stuck on the construction part (housing, etc.)

Bertrik Sikken at 11:35, 3 April 2018

2018-04-03T11:35:34Z

← Older revision		Revision as of 11:35, 3 April 2018
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	Next steps:		Next steps:
	* just play back stuff in a loop from a fixed directory on the sd card		* just play back stuff in a loop from a fixed directory on the sd card, using [https://github.com/bertrik/batplayer/blob/master/play.py this script] that is started on boot (using systemd or an @boot cronjob)
	* file transfer can be done using winscp?		* file transfer can be done using winscp?

Bertrik Sikken: /* Status */

2018-04-03T11:33:47Z

Status

← Older revision		Revision as of 11:33, 3 April 2018
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	Next steps:		Next steps:
	* ~~work on automatically mounting USB stick and playing the file on it~~		* just play back stuff in a loop from a fixed directory on the sd card
	** simple alternative: just ~~put~~ in a ~~USB stick and reboot~~		* file transfer can be done using winscp?
	** simplest alternative: just put the audio files on the sd card ~~and forget about the USB stick for now~~
	* ~~design a simple lasercut case, possibly just a designed basic on a simple [http://www.makercase.com/ makercase] box~~
	** customised with extra holes for USB battery, USB stick speaker
	** drill holes for tie-wraps to hold everything together on the inside of the box

	== Hardware ==		== Hardware ==

Bertrik Sikken: status

2018-04-03T11:31:07Z

status

← Older revision		Revision as of 11:31, 3 April 2018
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	== Status ==		== Status ==
			2018-04-01: I have a box with the piezo speaker mounted in it. Still a bit stuck on the auto-play-on-USB-plugin stuff. First, I could just play back audio from a specific directory first.
	2017-10-10: basically I'm stuck on the software part, unable to decide how I should solve how to play audio files on USB stick plugin, I've got several hints but no definite solution. Getting more hints like "why don't you try X" are confusing the issue more. Also a bit stuck on the construction part (housing, etc.)		2017-10-10: basically I'm stuck on the software part, unable to decide how I should solve how to play audio files on USB stick plugin, I've got several hints but no definite solution. Getting more hints like "why don't you try X" are confusing the issue more. Also a bit stuck on the construction part (housing, etc.)
	2017-06-24: successfully played audio back from a raspberry pi 3, running the amplifier from one of the USB ports. The rpi3 shows a little lightning bolt indicating undervoltage while playing.		2017-06-24: successfully played audio back from a raspberry pi 3, running the amplifier from one of the USB ports. The rpi3 shows a little lightning bolt indicating undervoltage while playing.

Bertrik Sikken at 18:09, 15 November 2017

2017-11-15T18:09:09Z

← Older revision		Revision as of 18:09, 15 November 2017
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	]		]
	</pre>		</pre>

			In short:
			* a signal org.freedesktop.DBus.NameAcquired on path /org/freedesktop/DBus
			* a signal org.freedesktop.DBus.ObjectManager.InterfacesAdded on path /org/freedesktop/UDisks2, object path "/org/freedesktop/UDisks2/drives/VBTM_Store_27n_27go_0E21E5708251F9A3" with information about the physical USB stick
			* a signal org.freedesktop.DBus.ObjectManager.InterfacesAdded on path /org/freedesktop/UDisks2, object path "/org/freedesktop/UDisks2/block_devices/sdb" with information about the /dev/sdb partition
			* a signal org.freedesktop.DBus.ObjectManager.InterfacesAdded on path /org/freedesktop/UDisks2, object path "/org/freedesktop/UDisks2/block_devices/sdb1" with information about the /dev/sdb1 partition

	== Audio files ==		== Audio files ==
	Suitable audio files for playback:		Suitable audio files for playback:
	* the 'synthesized' versions from [http://www.batcalls.com/ batcalls.com] by AviSoft, these are mostly mono 16-bit PCM, sampled at 250000 Hz		* the 'synthesized' versions from [http://www.batcalls.com/ batcalls.com] by AviSoft, these are mostly mono 16-bit PCM, sampled at 250000 Hz

Bertrik Sikken at 14:30, 6 November 2017

2017-11-06T14:30:30Z

@@ Line 175: / Line 175: @@
 * use udev to detect when the USB stick in removed, force kill the python script + any child commands, automatically force unmount it
 Can we use systemd to automate part of the steps above?
 == Various dumps ==

Bertrik Sikken: /* USB sound card */

2017-11-06T07:43:10Z

USB sound card

← Older revision		Revision as of 07:43, 6 November 2017
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	=== USB sound card ===		=== USB sound card ===
	I'm ~~considering~~ this one:		I'm using this one:
	[https://nl.aliexpress.com/item/SA9227-PCM5102A-32BIT-384KHZ-USB-DAC-HIFI-Asynchronous-Decoder/32722112944.html USB sound card based on a SA9227+PCM5102 chip].		[https://nl.aliexpress.com/item/SA9227-PCM5102A-32BIT-384KHZ-USB-DAC-HIFI-Asynchronous-Decoder/32722112944.html USB sound card based on a SA9227+PCM5102 chip].

Bertrik Sikken: /* Speaker */

2017-11-06T07:42:23Z

Speaker

← Older revision		Revision as of 07:42, 6 November 2017
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	I'm considering this one:		I'm considering this one:
	[http://www.parts-express.com/peerless-by-tymphany-xt25sc90-04-1-dual-ring-radiator-tweeter--264-1014 Vifa/Tymphany XT25SC90-04].		[http://www.parts-express.com/peerless-by-tymphany-xt25sc90-04-1-dual-ring-radiator-tweeter--264-1014 Vifa/Tymphany XT25SC90-04].

	This speaker is also used in other products that produce ultrasonic audio.		This speaker is also used in other products that produce ultrasonic audio.
			Price: about E22,-

	~~Price~~: ~~about E22,~~-		Apparently this very inexpensive piezo horn tweeter from Maplin also works quite well:
			https://www.maplin.co.uk/p/wide-dispersion-piezo-horn-tweeter-wf56l

	=== Power ===		=== Power ===

Bertrik Sikken at 09:06, 5 November 2017

2017-11-05T09:06:47Z

← Older revision		Revision as of 09:06, 5 November 2017
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	* https://unix.stackexchange.com/questions/28548/how-to-run-custom-scripts-upon-usb-device-plug-in		* https://unix.stackexchange.com/questions/28548/how-to-run-custom-scripts-upon-usb-device-plug-in
	* https://coreos.com/os/docs/latest/using-systemd-and-udev-rules.html		* https://coreos.com/os/docs/latest/using-systemd-and-udev-rules.html
			* http://blog.fraggod.net/2012/06/16/proper-ish-way-to-start-long-running-systemd-service-on-udev-event-device-hotplug.html

	Challenges:		Challenges:

Bertrik Sikken at 08:38, 5 November 2017

2017-11-05T08:38:47Z

← Older revision		Revision as of 08:38, 5 November 2017
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	=== DBUS events for UDisks2 ===		=== DBUS events for UDisks2 ===
			<pre>
	bertrik@zenbook:/etc/udev/rules.d$ dbus-monitor --system "path='/org/freedesktop/UDisks2'"		bertrik@zenbook:/etc/udev/rules.d$ dbus-monitor --system "path='/org/freedesktop/UDisks2'"
	dbus-monitor: unable to enable new-style monitoring: org.freedesktop.DBus.Error.AccessDenied: "Rejected send message, 1 matched rules; type="method_call", sender=":1.113" (uid=1000 pid=32250 comm="dbus-monitor --system path='/org/freedesktop/UDisk") interface="org.freedesktop.DBus.Monitoring" member="BecomeMonitor" error name="(unset)" requested_reply="0" destination="org.freedesktop.DBus" (bus)". Falling back to eavesdropping.		dbus-monitor: unable to enable new-style monitoring: org.freedesktop.DBus.Error.AccessDenied: "Rejected send message, 1 matched rules; type="method_call", sender=":1.113" (uid=1000 pid=32250 comm="dbus-monitor --system path='/org/freedesktop/UDisk") interface="org.freedesktop.DBus.Monitoring" member="BecomeMonitor" error name="(unset)" requested_reply="0" destination="org.freedesktop.DBus" (bus)". Falling back to eavesdropping.
Line 768:		Line 769:
	)		)
	]		]
			</pre>

	== Audio files ==		== Audio files ==
	Suitable audio files for playback:		Suitable audio files for playback:
	* the 'synthesized' versions from [http://www.batcalls.com/ batcalls.com] by AviSoft, these are mostly mono 16-bit PCM, sampled at 250000 Hz		* the 'synthesized' versions from [http://www.batcalls.com/ batcalls.com] by AviSoft, these are mostly mono 16-bit PCM, sampled at 250000 Hz