China cheap MP3 player hack

Today I receive my package:

Some errors ( :( )

- wrong position of LCD pads - should be more in right and down position

- soldermask on "buttons" - but I can easy fix this

- a little different pinout to jack plug, but it is still ok to solder

Quality of PCB - GREAT! :)

Unfortunately - only one output pin (on jack), but we can also use SWDIO and SWCLK. Order from China so I need to wait 3-4weeks to test it.

I've created schematic and board with all important elements on its positions:

Eagle files: https://github.com/dambo1993/chinaMP3hack

The most valuable from this device is of course LCD. But first I didn't know what controller is in it.

Simple debug connections:

Problem with connection to saleae:

At this point I can copy value from uc to LCD and retransmit it, buf then I've found this site:

http://overskill.alexshu.com/cheaphack-a-2-5-chinese-mp3-player-for-its-128x64-mini-lcd/

with explanation about LCD type. It is UC1701. We cen use arduino library u8glib to play with it.

As display PCB I use universal board for uC:

So I can easy connect LCD to breadboard.

What can we find in 2 dollars MP3 Player:

- nice custom package

- graphic lcd (uc1701) 128x64px

- Li-Po battery (I think ~100mAh)

- USB connector

- Jack 3.5mm connector ( Mouser #161-3334-E )

- SD card slot

- on/off switch ( https://www.sparkfun.com/products/10860 )

- membrane keyboard

- asic for mp3 player (I think useless)

For 2 dollars!