This Audio Playback module is used to play audio files in high quality mp3 format. The module doesnt require any external USB storage (PenDrive) to save the audio files. The modules has inbuilt SPI-FLASH memory. When the device is connected to the computer via USB cable the module itself is detected as removable mass stoarge device. You can directly copy the MP3 audio files in to the removable storage. The total capacity of the module is 4MB which can store approximately 500 seconds of audio. To maximise the number of files / audio playback duration one can use any third party MP3 bitrate converter software to reduce the bitrate and make mono audio.
The module has 8 key inputs where the first 8 messages can be triggered with these inputs. If the number of audio files are more then it can be controled by serial(UART) command.
All files should be placed inside folders named 01 to 99.
Each folder can have up to 255 files. The files should be named with three digit number like 001.mp3, 255.mp3.
The first 8 files in side folder name "01" will be triggered using 8 key inputs.
The entire module is powered by regulated 5V power supply.
The module has on board power amplifier which can be directly connected to a speaker. Pre-amplifier output is also available to connect with an external amplifier circuit.
Commands:
The module can be controlled by simple serial command. The baud rate is fixed to 9600. There are only 2 commands.
Volume : AT+VOL=0Fcr(value can be 0-30) 0F is a single byte(hex value) which means volume will be set to 15.
Play : AT+PL=FNSNcr
(FN - Folder Number value can be 01-99 (0x01 to 0x63)) - One byte (SN - Song Number value can be 001-255 (0x01 to 0xFF)) - One byte All commands ends with cr which is carriage return(0x0d).
Applications:
Voice prompts in consumer electronics.
Interactive toys and educational devices.
Public announcement systems.
IoT devices with audio feedback.
Automotive systems (e.g., GPS voice guidance).
This product can be customized as per need.
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