 This embedded MP3 module is an universal and compact circuit (37 mm x 27 mm) for playing MP3 audio files. The MP3 module can be used in embedded systems.
The MP3 files (up 65,536) are stored in a micro SDcard.This embedded MP3 module is an universal and compact circuit (37 mm x 27 mm) for playing MP3 audio files. The MP3 module can be used in embedded systems. The MP3 files (up 65,536) are stored in a micro SDcard.
Controlling the module could be done either by buttons and digital inputs or via TTL serial interfaces.
The MP3 module (developed by Luca Pascarella info at lpsystems dot eu) is based on MP3 converter VS1011 and a PIC24 and can play up to 65,536 songs or voice messages stored in a microSD. Each track can be selected via serial lines or by using 9 buttons or switches (64 mp3 files with dip switch). If you choose the serial communication you have to use a microcontroller, using the 9 digital lines you can control the player with logic signals from stations of various kinds, such as tension-indicator lamps, relays, etc.. The module can be used to play voice messages in vending machines, telephone systems, in the car to inform the driver of the vehicle’s condition and environmental ones, in alarm systems, to assist configuration and inform about events that occurred, and in many other areas yet. The device supports micro SD with capacity up to 16 GB and can be powered with a voltage of 3.3 Vdc or 5 Vdc selectable. The module has a single in-line single-connector positioned on one side of the PCB, so you can better manage the space and mount it also in upright position.
In "Pin-to-Pin” mode is provided the use of three buttons (PLAY / STOP, VOL UP and VOL DOWN) and a 6-way DIP switch connected to the module, while "Serial” mode the serial communication is with TTL signal level. The device can also be used in "Mixed” mode that allows you to issue orders both with serial port and pin-to-pin input.
In the mode Pin-to-Pin (mode 1) to perform a song you have to select the track number using binary inputs IN1, IN2, IN3, IN4, IN5 and IN6 and then run the selected file simply giving a ground pulse on the PLAY line. Applying logical zero on the lines VOL_UP and VOL_DOWN, you can respectively increase or decrease the volume.
In serial mode (mode 0) commands are very similar to the Pin-to-Pin, except for the choice of the MP3 file, which must take place in several stages within a time limit fixed in the configuration file. The special command # allow to insert the name of the track and the second special command * and the input.
For example, to play the file 65.mp3 you must perform the following steps:
• Step 1 (mode track name) = #;
• Step 2 (first byte of the track name) = 6;
• Step 3 (second byte of the track name) = 5;
• Step 4 (mode locking of track name, optional if you wait timeout) *;
• Step 5 (Play) = P;
• Step 6 (Stop) = S. Mixed mode (Mode 2) allows to give orders both serial and pin-to-digital input pin. In this case the number of inputs usable is 4, for a total of 16 tracks addressable with Pin-to-Pin mode.
The names of MP3 files must be a number from 0 to 65535 followed by the extension .mp3 (for example, 0.mp3, 1.mp3, 2.mp3, 3.mp3 16.mp3 … … 65535.mp3). Schematics and BOM 
Firmware download Diagram |
