MP3, WAV player

Duval JP · Joined: 22 Jun 2004 Posts: 1161 Location: France

hi
a small project based on the DF0534 MP3 WAV module from DFrobot
This module allows the reading of audio files in MP3/wav format sampled from 8 kHz to 48 kHz on a storage space of 8 Mb. This is not much but very sufficient to make sound effects, to send alert messages or .... to sound a clock.
They are many possibilities and you will discover them on the wiki of the manufacturer.
What I retained:
- We transfer MP3 or WAV files to the internal flash memory as if it were a USB key.
- attention : the order of the files does not work as indicated on the notice, I did not understand why ?
so it is necessary to test everything for example I renamed my files as indicated 01.mp3, 02.mp3.... but to launch the 01 I must send the code &h0A the code &h01 makes it possible to read a pre-recorded file which I left for the tests and renamed as 20.mp3.
- You have to start by adjusting the volume
- If you are using the include and enriching it, please let us know.

The demo programme allows you to play the attached pieces.
I have added waiting times between each call of the sub play( track) but in one of your programme you can for example launch sound 01 when the pressure, the tension was low... is sends your alarm without interrupting your programme.
the video :

[url] https://youtu.be/EOLCZLjy13g[/url]

JP Wink

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

thanks for sharing JP.
I moved the topic to AVR since it was in 8051 and the processor used was an AVR.
Should run on 8051 too with minor changes.

Duval JP · Joined: 22 Jun 2004 Posts: 1161 Location: France

Duval JP · Joined: 22 Jun 2004 Posts: 1161 Location: France

Hi,
I add 2 new sub: Volup (increase volume of 1 step) and voldown (decrease volume 1 step) to the include file and I use only one line to printbin , like that it is more compatible withe the C sample from Dfrobot

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

thanks for the addition. i only do not get why you add a 0 to a byte?

Duval JP · Joined: 22 Jun 2004 Posts: 1161 Location: France

Hello Mark,
You know, I follow the wiki. but they give very poor help , maybe the process need a null char

i.dobson · Posted: Sat Jan 30, 2021 5:48 pm Post subject:

Hi,

What mark means is, why are you wasting cpu time:-

Cs = &HAA + &H14 : Cs = Cs + &H00 :

X+0=X

Regards
Ian Dobson

Duval JP · Joined: 22 Jun 2004 Posts: 1161 Location: France

You are right Ian
for the checksum That is a coy/paste drama . I use the same line for all routine Rolling Eyes

but you have to send the &H0 when the routine need it
see
https://wiki.dfrobot.com/Voice_Module_SKU__DFR0534
Wink

JP