MP3 2 Click is an audio decoder expansion board with on-board microSD card slot, that enables you to create your personal audio playback system. It holds the KT403A,a SOC chip solution with intergraded MCU, hardware audio MP3/WAV decoder and DSP, from Shenzhen Qianle Microelectronics Technology Co. Ltd. All the mentioned integrated hardware components enable the MP3 2 Click board to guarantee good stability and tone quality. You are able to use UART serial communication to control this board and do diverse operations with music files from microSD card such as Play, Pause, Volume Up/Down, any many more. These features make MP3 2 Click the ideal solution for audio device, in any application that demands an Audio Playback Module for MP3, WAV.

MP3 2 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.

The MP3 2 Click is equipped with the KT403A as a main integrated circuit, micro SD card connector, and 3.5mm Audio Jack connector. Basically, it is a complete solution for a DAP (digital audio player) on a Click board, which can be controlled over the UART communication interface, using RX and TX pins of the mikroBUS™ socket. The default baud rate is 9600bps and it is customizable.

On the MP3 2 Click, KT403A serves as a brain. It is complete SOC, which integrates16-bit MCU, audio decoder, and a 24-bit DSP. It also integrates the complete SD card interface and therefore, this Click board contains the connector onboard for an external micro SD card. Thanks to that, the user can insert a fair amount of memory if the long, continuous playback time is needed.

MP3 2 Click has two status indication LEDs, onboard. The first one is named “SD Card” and it serves as an indication that the SD Card is present in the slot. The other one is “Chip Correct” and it indicates that the SD Card is correct and that the communication between the KT403A and the SD Card sucseeded. Besides the indicatora, there is one 3.5mm headphone jack onboard, so that MP3 2 Click can be connected directly to the next stage of the music playback system, ie. audio amplifier.

Using the predefined command set, MP3 2 Click can be fully controlled. One can Play/Pause a song, play a specific track, change a Volume Up and Volume Down between 0% and 100%, play the next or the previous song, repeat the current song, and more. Besides that, several sound effects are also supported, mentioned for different types of music: Normal, Jazz, Classic, Pop, and Rock.

This Click board™ can be supplied and interfaced with both 3.3V and 5V without the need for any external components. The onboard SMD jumper labeled as VCC SEL allows voltage selection for supply IC, but this Click board™ communication interface and is designed to be operated only with a 3.3V logic level.

• Interface: UART
• Compatibility: mikroBUS™
• Dimensions: 42.9 x 25.4mm
• Input Voltage: 3.3V or 5V

• Schematic
• KT403A Datasheet
• mikroSDK
• GitHub