Project:Music Station: Difference between revisions
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From an electronics perspective, the system uses a [[Raspberry Pi]] in combination with a [http://www.suptronics.com/xseries/x400.html X400 HAT]. | From an electronics perspective, the system uses a [[Raspberry Pi]] in combination with a [http://www.suptronics.com/xseries/x400.html X400 HAT]. | ||
It gets powered by a couple of lead batteries. | It gets powered by a couple of lead batteries. | ||
The wiring is as follows: | |||
GPIO 22 & GND are connected to the shutdown button. | |||
GPIO 14 & GND are connected to the status LED. | |||
The case is built with [[Film Faced Plywood|film faced plywood]]: | The case is built with [[Film Faced Plywood|film faced plywood]]: |
Revision as of 23:52, 22 February 2019
ProjectInfoBox Music Station | |
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Status: | done |
Release Date: | August 2018 |
Initiator: | Martin |
Team: | Martin |
Materials Used: | film faced plywood |
Tools Used: | Raspberry Pi |
Software Used: | Musicbox |
Since existing bluetooth speakers do not provide enough power, Martin decided to build custom speakers for usage on the camping ground of different festivals.
Software
The system is based on a regular Rasbian Lite installation, which gets adjusted by the installation script in the following way:
- Installation and configuration of mopidy and useful extensions
- Installation and configuration of bt_speaker
Hardware
From an electronics perspective, the system uses a Raspberry Pi in combination with a X400 HAT. It gets powered by a couple of lead batteries.
The wiring is as follows: GPIO 22 & GND are connected to the shutdown button. GPIO 14 & GND are connected to the status LED.
The case is built with film faced plywood:
Further Improvements
Check possibility to use a ESP32
On the last Festival, I was mainly using the bluetooth functionality. Playback using Mopidy as well as the Wifi Hotspot was not really used. For bluetooth playback, a ESP32 should be enough. This should lower the needed power significantly.
Shutdown board in case of power losses
Since the system is powered by batteries, there is a possibility of sudden power outages due to a lack of remaining battery power. Therefore, there should be a circuit which either switches from one battery to another and then possibly sends a shutdown signal to the system.
Note: This is only needed for Raspberry Pi based systems.
Different speaker
So far the system is based on Visaton PX-10 speakers. Since they don't provide Thiele/Small parameters, I didn´t calculate the needed box volume and just made a 12 liter box for each speaker, which is most likely way too much.
The next version should use different speakers where the ideal box volume is known.
Make a workshop out of it
Once the new design is complete and tested, there could be a seminar in which we teach others to build their own bluetooth speaker.