The BMT WTV020 Mini SD Card MP3 Module is a compact audio playback module based on the WTV020SD-20 chip, designed for easy integration into DIY electronics, microcontroller projects, or standalone audio applications. This module can play audio stored on a microSD card without the need for a computer, making it perfect for talking devices, alarms, educational toys, or interactive projects.
It supports direct speaker output through its SPK+ and SPK- pins, or a single-ended DAC output via AUDIO-L, which can be connected to an amplifier. Users can control playback through physical push-buttons for play/pause, track forward/backward, and volume adjustment, or via a two-wire serial interface for advanced random track selection and control.
Key Features
Audio Playback: Supports WAV files in 4-bit ADCPM format
Storage: Compatible with FAT-formatted microSD cards from 2.32MB up to 1GB
Control Options: Keyboard trigger, two-wire serial, or UART232 serial interface
Multi-Folder Support: Automatic recognition of folders and files for structured playback
Audio Output: DAC output (AUDIO-L) or direct 8 speaker output (SPK+/SPK-)
Power: DC 2.6 - 3.6V
Playback Flexibility: Supports any segment of speech or combined file playback
Memory Management: Retains data and playback position after power-off
User-Friendly: Load audio to SD card directly without additional software
Compatible Chip Packages: WTV020-16SOP and WTV020-20SOP
Specifications
Model: WTV020
Duration per track: ~20 seconds (mono)
Audio Output: DAC/PWM
Keyboard Trigger I/O: 7 pins
Parallel Address Pins: 7
Control Modes: Keyboard Parallel (COM + SBT), Serial
Applications
Talking toys and educational devices
Home alarms and notification systems
Voice reminders and alerts
Interactive exhibitions or museums
Small audio playback for microcontroller projects
This BMT WTV020 Mini SD Card MP3 Module is a compact, versatile solution for adding voice and sound playback to embedded electronics or standalone devices.
What's in the box
1 x BMT WTV020 Mini SD Card MP3 Audio Playback Module - WTV020 Based
