This project has the following feature set:
- a smallish and spartan music player that can work for weeks between charges
- a 2Ah Li-poly cell and an integrated charger - 5V input
- decoding of ogg vorbis, mp3 files
- microSD (SDHC) is the storage medium. so fat32 and cards bigger than 4G.
there are 2 components in this repository:
avr - contains the C source code for an Atmel-based microcontroller
beaglebone - contains the C source code for beagle-bone (ARMv7)-based tools
hardware - open source hardware for the main board
the schematic is based on VLSI's Simple DSP Evaluation Board [1]
Library dependencies for the avr code:
if using the master branch:
none (this is a fully standalone version)
if using the old 'arduino' branch:
sdfatlib http://code.google.com/p/sdfatlib/
vs1063 https://github.com/rodan/vs1063
IRremote https://github.com/shirriff/Arduino-IRremote
Usage:
- an RC5 remote control provides the control (a Vishay TSOP IR receiver's output goes to PD2).
- by default music files are played randomly. the following buttons are configured:
VOL- decrease volume
VOL+ increase volume
SUBTITLES switch between 4 levels of spatial processing (for headphones)
REWIND switch to album mode
CHANNEL- switch to artist mode
CHANNEL+ next track in either of the modes
STOP sends the player in low power shutdown mode.
you need to start it again to exit this.
NUMBERS 0-9 select artist (which directory from the root of the filesystem to play)
AV disable artist selection
Power consumption profile:
- jumper/switch open - battery connected only to the charging circuit - < 3uA
- normal file decoding - 30-40 mA
- shutdown (after STOP ir command), IR sensor active - 800uA
- after uC woken up by ir sensor trigger, waiting for a POWER ir sequence (for max 2 seconds) - 4.5mA (this mode has been disabled in the code)
- if the stereo jack is unused or if the battery level goes below safe LiPo levels then the player enters shutdown mode.
Known problems and limitations:
- you should format the SDcard as Fat32 with largest available cluster size
- no special chars must be used in the filesystem entries, only ascii alphanumeric chars
- there is a hardcoded MAX_PATH that only allows about 4 parent dirs to any music file
Tested with:
- 16G Class 10 Adata card, with ogg files over the 4G barrier
Author: Petre Rodan <2b4eda@subdimension.ro>
Available from: https://github.com/rodan/playa
Product pictures: https://photos.app.goo.gl/nUQuD7HJvfVBpMeQ9
License: GNU GPLv3
[1] http://www.vlsi.fi/en/support/evaluationboards/vs1053vs8053simpledspboard.html
GNU GPLv3 license:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.