Project Logs

Collapse

• PCBs!!!

  dambusio • 06/13/2017 at 18:44 • 0 comments

  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! :)
  

• STM32F0 dev board

  dambusio • 05/26/2017 at 11:20 • 1 comment

  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.
  

• Eagle PCB template

  dambusio • 05/25/2017 at 00:17 • 0 comments

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

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

• Hack a LCD

  dambusio • 05/25/2017 at 00:08 • 1 comment

  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.
  

• MP3 Player dissassembly

  dambusio • 05/24/2017 at 23:54 • 0 comments

  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!
  

View all 5 project logs