This document introduces the usage information and product features of Guangzhou Weichuang Electronics Co., Ltd. WTM9501M03, including support for MP3 audio format, playback of 8-320Kbps MP3 audio files, support for up to 32G Byte capacity SD cards, etc.
The WT9501M03 is a compact voice module that supports MP3 audio playback (8‑320 Kbps) from SD cards up to 32 GB or USB drives. It can be controlled via button inputs or a UART serial interface at 9600 bps, and offers optional D‑class 3 W×2 amplifier output.
The document provides detailed pin assignments, command codes for play, pause, stop, volume and track selection, as well as example wiring diagrams for both button‑mode and MCU‑mode operation. Revision history and company information are also included. This manual is written in Chinese.
| Audio format | MP3 |
|---|---|
| Supported bitrate | 8–320 Kbps |
| Maximum SD card capacity | up to 32 GB |
| Dimensions | 41 mm × 39 mm |
| Operating voltage | DC 5 V |
| UART baud rate | 9600 bps |
Use the volume command A4 with a value from 00 to 19 (0–25 levels); 00 is mute and 19 is the maximum volume.
The module can be operated in button mode using the IO pins or in UART serial mode with a 9600 bps baud rate.