Rayman wrote: »
Looks like you need a resistor on the serial link...
erco wrote: »
I haven't used this specific MP3 player module, but I have used the YX5300, which is likely similar. I wrote about it here and included some info about using it with several processors, including our beloved BS2. The first time you use these can be confusing. You must remember that the MP3 module has its own onboard processor and may be off doing its own thing and apparently not responding to your commands. When in doubt, restart the MP3 module (cycle the power) and give it a second or two to initialize. Also, add a brief pause between serial commands to let the module catch up. Once you get all the timing and commands working, keep a copy of that program handy and use it as a template for future projects.