Thanks for the reply.
Shame! I've tried three different mp3 modules now.
The Adafruit version does allow access to the SD card but uses quite a few more IO pins which doesn't really leave enough (with a ATmega328) to drive a display, a few buttons and maybe an IR control.
This one is very similar to the WT5001M02-28P but, again, there's no access to the SD card. In its favour, it's quite a bit smaller.
Thanks,
John.
Take a look at the WT2000M04 module. It's described as a recording module, but it seems to have all the playback features of the WT5001, plus built in amplifier. I haven't looked at the datasheet much, but it seems to support playback by file names.
Alternatively, you might look at a USB hub and see if you can store files on thumb drive and access it by both Arduino and WT5001. Not sure if that's possible.
BTW... did you know that the logic I/O for this sound module is designed for 3.3v? Examples above show connections to Arduino UNO (5v I/O). May work fine with 5v Arduino transmitting serial commands to WT5001, but for Arduino receiving command replies from WT5001, may not be reliable without a level shifter or using Arduino running at 3.3v.
The WT2000M04 does look promising but,unfortunately, I can't find a detailed datasheet or a small-quantity supplier.
IF this project ever gets off the ground,I'll probably run the ATmega328 at 3.3v because the display I have in mind and the Si4703 FM tuner are both happier at 3.3v anyway.
Actually, the WT5001M03-28P looks promising as it's similar to the WT5001M02-28P but with provision for an external SD card. If I order one now, I should receive it before the Chinese New Year - just 
John.
Sounds like the WT5001M03-28P will work best for you. You can request the datasheets direct from Waytronics, via e-mail from their web site.
http://www.waytronic.com/voicemodule.asp?/1.html
The WT2000M04 can be sourced single quantity on eBay for about the same cost. I looked at the WT2000M04 datasheet. It supports playback by filename, but will only confirm (yes/no) if a file with a filename exists on the SD-card (no directory listings).
Thanks for the link, I'll get in touch with them.
I'm thinking I might be able to use a quad SPDT IC ( http://www.farnell.com/datasheets/82522.pdf ) to read the SD card in the "normal" way with the Arduino SD (SPI) library, choose the file I want to play and then switch the SD card over to the WT5001M02 to actually play it.
There's probably a more elegant way of doing it but that's about the limit of my "design" ability
John
Hi All,
I finally got the WT5001M03-23P module working, switching the SD card between the module and the Arduino:
https://www.youtube.com/embed/WYUum27jYKw
I've put the circuit I used on my website here: (Article as yet unfinished)
http://vwlowen.co.uk/arduino/mp3-player-2/home-mp3-player.htm
(Scroll down to skip the intro.)
John.
Hi,
Since we have Waytronic Support here on the forum, I would like to ask about the status of playing .wav files with the WT5001M02-28P. Is it feasible? Could anyone make it work?
I would also love to see a timing diagram showing the lag between finishing the serial communication via USART till starting playing the sound. For my build it would be very important to switch between the sound files so that they sound overlapping (yes, I'm also working on a Star Wars prop ). With regards to overlap, does that issue still exist that at the beginning of an .mp3 sound file a "click" will be heard?
So i'm having some issues with this module. Whats going on is when i attempt to play a file it doesn't do anything but by accident i noticed if i run my Speaker neg over the module then it will start playing files like it should. but sometimes when i do it it also just keeps repeating it self. Any ideas? here is a youtube video on it.
Any Help with this would be greatly appreciated.
Hi everybody:
Can it play multiple track at same time?
I want to play sound effect at same time.
Thanks.