The MP3stick is a simple and small portable MP3 player. A microcontroller Atmel AVR ATmega128 is the heart of the circuit. MP3 decoding is done by an VLSI VS1011b decoder IC. A MMC/SD card works as memory medium for MP3 files, playlist files and skin files. The player is designed to draw his power from a LiIo/LiPo battery with 3.6V. a charger cicuit, based on MAX1811, is included. All information will be shown on a Nokia color LCD with 128×128 pixel and 256 colors. The player will work in text-only mode and if a skin file is available, also with nice graphic skins. A docking port allows outside connectivity for serial control signals, audio signals and charger voltage input.
Project Pictures
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- IC4 ATmega128L-8A,UMain controller running at 8MHz internal RC oszillator, circuit is ATmega1281 or ATmega2561 compatible
- IC2 VS1011b MP3 decoder IC
- IC3 LM2940IMP-5.0 Low drop fixed voltage regulator, supplies 5V to battery charger from 5-26V input voltage
- IC5 MAX1811ESA LiIo/LiPo battery charger, set to 100mA charging current, selectable battery type
- IC6 LP2981IM5-3.3 Low drop fixed voltage regulator, main 3.3V power supply
- IC1 LT1932 White LED driver, power supply for LCD backlight
- LCD1 Nokia color LCD from Nokia 6610 phone, connected via Hirose DF23 connector
- SW1 Alps SLLB Slide and push button switch made by Alps
- CARD1 FPS009-3002 Yamaichi SD/MMC slot
- K4 7pin Header Docking port , 2.54mm / 0.1″ Pinout:
- 1 – Charger input 5-26V
- 2 – Serial input, 19200 Baud, 3.3V level
- 3 – Serial output, 19200 Baud, 3.3V level
- 4 – GND
- 5 – Left audio out
- 6 – Right audio out
- 7 – Not connected
Player overall size: 22×39x64mm
- Copy your MP3 files to SD/MMC card as required. Don’t care about file and folder names or directory structure.
- Create an M3U playlist from your SD/MMC card content. Save this playlist root directory of your card. The first 32 characters of the filename will be equal to MP3stick playlist name.The firmware supports normal and extented M3U playlists, where the extented format is preferred.
- Download the iPod theme skin. All required files are included.
- Change the BMP images as required, read the Bitmaps.txt file about there format and decription.
- Change the lcd_layout.h as required. If you change this file you must recompile and reload the firmware with this file included.
- Run the skin_packer.exe to compress all BMP images to one binary file, the skin.skn.
- Copy the skin.skn file to your SD/MMC card root directory.Note: The MP3stick player will work without *.skn file, but in text-only mode then.
- Connect the MP3stick PCB to your STK500 development board via ISP interface. For pin-out see schematic file page 2.
- Program the correct fuse settings. See pictures above.
- Unpack the ZIP file and run the batch file “ISP_rc_calib.bat”. The tool will tell you the RC calibration byte after successful calibration process. STK500 is expected on COM1.
- Enter the calibration byte in firmware file “firmware_conf.h” then recompile and update the firmware on your player.
Power consumption
- Test voltage 4.1V
- Play mode, LCD Backlight OFF, 2GB card 52mA
- Play mode, LCD Backlight 50%, 2GB card 66mA
- Play mode, LCD Backlight 100%, 2GB card 85mA
- Stop mode, LCD Backlight OFF, 2GB card 27mA
- Stop mode, LCD Backlight 50%, 2GB card 42mA
- Stop mode, LCD Backlight 100%, 2GB card 58mA
- Sleep mode, 2GB card 860uA
- Sleep mode, no card 540uA
Firmware features
- Written in C for WinAVR compiler based on avr-gcc v3.4.5 or higher including avr-libc v.1.4.3 or higher
- Supported file system FAT32
- Direct M3U playlist support
- ID3 v1 & v2 tag support (title, artist, album, title length[v2])
- Color skin/theme support, Yampp3USB/Yampp7 compatible
- Adjustable LCD contrast, backlight brightness and auto off time, bass enhancer in VS1011b, volume and balance
- All adjustable options are stored in EEPROM Serial IO interface
- 3.5mm audio jack
- External audio via docking port
- One key handling
- Battery voltage monitoring
- Auto power off on low battery
- Remote control via serial interface
- Information output for firmware and bootloader via serial interface
Key handling
- Stop mode
- Up – no function
- Center short press – no function
- Center long press – enter menu
- Down – no function
- Play mode
- Up – previous title
- Center short press – no function
- Center long press – enter menu
- Down – next title
- Menu mode
- Up – previous menu entry / increase selection
- Center short press – execute function, select/deselect entry to modify
- Center long press – no function
- Down – next menu entry / decrease selection
Serial control commands
- Play – g
- Stop – G
- Next title – n
- Previous title – p
- Next playlist – N
- Previous playlist – P
- Menu – M
- Up – U
- Down – D
- Enter – E
- Sleep – S
Menu functions
- PLAY / STOP
- start and stop playing
- NEXT TITLE
- select next title
- PREV TITLE
- select previous title
- NEXT PLAYLIST
- select next playlist
- PREV PLAYLIST
- select previous playlist
- VOL
- change volume, range 0 – 10
- BAL
- change balance, range -10 – 0 – +10
- BASS Hz
- change bass boost low limit frequency, range 0-150Hz
- BASS dB
- change bass boost amplitude, range 0-15dB, 0dB turns the booster off
- RANDOM
- change random play mode
- OFF – normal play mode, song after song, single playlist
- SONG – random song from actual playlist
- PL – song from random playlist
- PL+SONG – random song from random playlist
- PL->PL – song after song from all playlists
- BLIGHT s
- change backlight auto off time, range 0-25s, 0 means always on
- BLIGHT %
- change backlight brightness, range 0-100%
- CONTRAST
- change LCD contrast
- SLEEP
- turn player off, set into sleep mode
- BOOTLOAD
- call the bootloader for firmware loading
- Only for empty controller: Programm the bootloader into the ATmega128 using a In-Circuit-Programmer (ISP)
- Compile the firmware as required, or use the precompiled firmware file.
- Copy the firmware binary file: MP3stick.bin to the root directory of your MMC/SD card
- Cycle power or call the bootloader from menu
- The bootloader will search the root directory for the file MP3stick.bin. The file will be deleted by the bootloader after programming the uC.
- You can monitor bootloader activity via serial interface.
How to use the Bootloader
- Only for empty controller: Programm the bootloader into the ATmega128 using a In-Circuit-Programmer (ISP)
- Compile the firmware as required, or use the precompiled firmware file.
- Copy the firmware binary file: MP3stick.bin to the root directory of your MMC/SD card
- Cycle power or call the bootloader from menu
- The bootloader will search the root directory for the file MP3stick.bin.
The file will be deleted by the bootloader after programming the uC. - You can monitor bootloader activity via serial interface.
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How to M3U playlists
- Copy your MP3 files to SD/MMC card as required. Don’t care about file and folder names or directory structure.
- Create an M3U playlist from your SD/MMC card content. Save this playlist root directory of your card. The first 32 characters of the filename will be equal to MP3stick playlist name.The firmware supports normal and extented M3U playlists, where the extented format is preferred.
How to create and use skins
- Download the iPod theme skin. All required files are included.
- Change the BMP images as required, read the Bitmaps.txt file about there format and decription.
- Change the lcd_layout.h as required. If you change this file you must recompile and reload the firmware with this file included.
- Run the skin_packer.exe to compress all BMP images to one binary file, the skin.skn.
- Copy the skin.skn file to your SD/MMC card root directory.Note: The MP3stick player will work without *.skn file, but in text-only mode then.
How to calibrate the internal RC oscillator
- Connect the MP3stick PCB to your STK500 development board via ISP interface. For pin-out see schematic file page 2.
- Program the correct fuse settings. See pictures above.
- Unpack the ZIP file and run the batch file “ISP_rc_calib.bat”. The tool will tell you the RC calibration byte after successful calibration process. STK500 is expected on COM1.
- Enter the calibration byte in firmware file “firmware_conf.h” then recompile and update the firmware on your player.
BOM BOM_MP3stick_v11.pdf
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MP3stick Schematic:
MP3stick PCB Gerber Files:
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