Update: At present I don’t have the SD card connector circuit diagram. Please don’t post in the comments asking for the circuit.
Long back in my blog I had posted how to make an USB mp3 player.
http://jeffrey.co.in/blog/2009/08/usb-mp3-player/
This mp3 player is made using a Chinese mp3 decoder board. Find more about the mp3 decoder board at http://www.vire.net.cn/
You don’t have to order it from china. It is available from most of the local electronic shops in INDIA. I don’t know about other countries.
The board is self explanatory. It has proper silk screen markings which shows how to connect. But still many had posted comments in my blog for the connection diagram of this board. I think it is hard for an electronics beginner to connect the board. So I thought of posting the connection diagram.
On the rear side of the board, there are three connectors.
They are for
1) Player buttons and IR sensor
2) USB and MMC/SD card interface
3) Power supply
For the board to play music, it needs a 5V DC power supply, USB port, 3.5mm stereo jack and an IR sensor to detect the signals from remote. You can also add switches to control songs, SD/MMC card slot, antenna for clear radio reception. All these are optional.
Connection diagram
The connection diagram doesn’t show how to connect an SD/MMC card socket. You can connect the SD/MMC to this player using an USB card reader.
Be careful while connecting the USB socket. If there is a connection mistake, it can damage your flash drive. Cross check the connection with the below image.
Bill of Materials
MP3 Player board + Remote Controller
USB socket
3.5mm stereo jack
IR sensor (3.3v)
5V power supply
Switches (optional)
SD/MMC card socket (optional)
NOTE: This is not an open Hardware project because the circuit diagram and PCB layout is not available from the vendor 
Today I was setting up my old unused Twitter account. Added all my FOSS friends.
Now you can get my tweets from https://twitter.com/jeffrey_antony
Lenovo G560 – My new laptop.
I got it three weeks before. It’s now powered by Ubuntu 10.04 Lucid Lynx
Some useful links 😉
1) Introduction to Robotics (Free Course from MIT)
This is a free course about Robotics from MIT. This course gives a small introduction to robotics. Course is made for intermediate users(Not that simple to understand if you don’t know mathematics). You can find more such free courses from MIT in MIT OCW.
2) [Some useful links 😉
1) Introduction to Robotics (Free Course from MIT)
This is a free course about Robotics from MIT. This course gives a small introduction to robotics. Course is made for intermediate users(Not that simple to understand if you don’t know mathematics). You can find more such free courses from MIT in MIT OCW.
2)](http://lwn.net/Kernel/LDD3/)
Learn about Linux Device Driver
3) ARM Projects
Some ARM projects
http://www.siwawi.arubi.uni-kl.de/avr_projects/arm_projects/
http://www.open-research.org.uk/ARMuC/
4) [Some useful links 😉
1) Introduction to Robotics (Free Course from MIT)
This is a free course about Robotics from MIT. This course gives a small introduction to robotics. Course is made for intermediate users(Not that simple to understand if you don’t know mathematics). You can find more such free courses from MIT in MIT OCW.
2) [Some useful links 😉
1) Introduction to Robotics (Free Course from MIT)
This is a free course about Robotics from MIT. This course gives a small introduction to robotics. Course is made for intermediate users(Not that simple to understand if you don’t know mathematics). You can find more such free courses from MIT in MIT OCW.
2)](http://lwn.net/Kernel/LDD3/)
Learn about Linux Device Driver
3) ARM Projects
Some ARM projects
http://www.siwawi.arubi.uni-kl.de/avr_projects/arm_projects/
http://www.open-research.org.uk/ARMuC/
4)](http://progit.org/)
Know some basics about Git which will become useful in future.
Its a long I updated my web page. So I thought of a new start. This time I made my page more simpler with basic black & white colour.
These days I was busy with my PG Diploma course in Embedded System Design. Update is going on…