Warning: the discussion is drifting to DIY electronic gadgetry. :) On Sun, 31 Jan 2016 11:16:26 +0100, Bo-Erik Sandholm <bosses...@gmail.com> wrote :
> I have decided to simplify the DIY head tracking dongle build and > setup in some aspects, now I have ordered this sensor that do not > need initial calibration. > This is the new sensor module: > https://learn.adafruit.com/adafruit-neopixel-uberguide/overview The page is about addressable LED modules. Is it an error? I would use a GY-85 board and a micro-controller, as seen here: http://www.rcgroups.com/forums/showthread.php?t=1677559 This is a good starting point. > It will initially be combined with a esp8266 module for WiFi > connectivity or maybe Bluetooth > http://www.esp8266.com/wiki/doku.php?id=getting-started-with-the-esp8266 > http://www.aliexpress.com/item/Promotion-Brand-NEW-HC-05-Wireless-Bluetooth-RF-Transceiver-Module-serial-RS232-TTL/32367579918.html Could there be some added latency when using wifi or bluetooth? A direct usb connection should be faster, but avoiding a cable would be desirable because many android devices cannot easily use their usb port for communication. If using wifi, I would try multicast udp. Here's a page that explains how to use the bluetooth module: http://www.instructables.com/id/Cheap-2-Way-Bluetooth-Connection-Between-Arduino-a/ > Power will probably be from one of these, giving around 10 hours of > operations: > http://www.aliexpress.com/item/4PCS-Hot-Sale-Soshine-900mAh-14500-battery-3-2V-LiFePO4-AA-Rechargeable-Battery/32242320597.html Nice! > I will send OSC (open sound control > https://en.m.wikipedia.org/wiki/Open_Sound_Control) directly from the > sensor. OSC is a good protocol, but an application specific protocol could be designed to be more compact, reducing the latency. > This should simplify the build of the head tracked sensor, reducing > the soldering need. There would be 4 modules involved: a sensing assembly, a micro-controller, a wifi transmission module, and a power supply. Going usb-wired would remove the wifi transmitter and the supply. A custom firmware can be programmed for the ESP-8266, which have GPIOs, so maybe it could be used as a micro-controller: http://hackaday.com/2015/03/18/how-to-directly-program-an-inexpensive-esp8266-wifi-module/ If a micro-controller is required, the trinket is an alternative to the arduino nano: https://learn.adafruit.com/introducing-trinket/ It's much smaller, works at 3.2V. For a 5V USB wired version, it can provide 3.2 volts for other boards. > This should simplify the setup of playback using > http://www.matthiaskronlachner.com/?p=2015 > And maybe later ambiexplorer can be modified to accept OSC data? It could even be used with a browser (chrome) based player. In the end, the first problem to avoid is latency, and it can invalidate many potential solutions. > This will allow you to use any headphones and DAC and amplifier > > Best regards > > Bo-Erik I already bought some of the parts to create a head-tracking device, months ago. Let's do it and share the designs. Even if we have personalized HRTFs with order 1024 decoders, we need head-tracking. The other solution is to use the sensors in phones or oculus-like devices, but they are all too big or a bit expensive for the task of listening to binaural audio only (not combined with visuals). > _-------------- > > I want to see a good quality over the ear stereo headphone with all > necessary electronics built into the headband. It will have single usb > connector which will provide power and digital audio (24 bit) and > carry head tracking information back to the computer, which will have > the software to play standard first order B-format files decoded to > binaural, using simple HRTF filters. The computer can be your > desktop, a tablet computer or a mobile. > > umashankar For a DIY project, integrating head-tracking and audio would be a lot, and the resulting device could be rather large. But I may be wrong. -- Marc _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
