WT2605A Bluetooth Music Module
Bluetooth 5.0 · MP3 Playback · Voice Recording · Light‑Sensitive · Ultra‑Low Power
The WT2605A Bluetooth Music Module is a feature‑rich DIY audio module that combines Bluetooth 5.0, MP3 playback, voice recording, and light‑sensitive trigger in a compact form factor. Designed for creative applications, it allows users to add personalized audio to greeting cards, gift boxes, and Bluetooth speakers. The module supports Type‑C charging and firmware updates, features ultra‑low standby current (≤10µA), and drives an 8Ω/2W speaker with clear, high‑quality sound. With multiple power options (3.7V Li‑ion, 3×1.5V button cells, or Type‑C 5V), it offers flexibility for any DIY project.
- Bluetooth 5.0 – wireless audio streaming
- MP3 playback – 16–320 Kbps support
- Voice recording – ~78 seconds (default 2MB Flash)
- Light‑sensitive – plays when illuminated
- Ultra‑low power – ≤10µA standby
- Type‑C – charging and firmware upgrade
WT2605A Bluetooth Music Module Key Features
WT2605A Bluetooth Music Module Electrical Specifications
| Parameter | Value / Condition |
|---|---|
| Power Supply | Type‑C 5V/1A, 3.7V Li‑ion battery, or 3×1.5V button cells |
| Standby Current | ≤10 µA (sleep mode) |
| Playback Current | ≤100 mA |
| Audio Format | MP3 (16–320 Kbps) |
| Speaker Output | 8Ω / 2W (typical) |
| Audio Loudness | ≥75dB (1 meter distance) |
| Recording Time | ~78 seconds (default 2MB/16Mbit Flash) |
| Recording Bitrate | ~26 KB/s |
| Bluetooth | 5.0 (name: “WT2605AERC”) |
| Module Size | 64.38 × 77 × 5 mm |
| Controls | Play/Stop, Record/Stop, Light sensor, Slide switch, External buttons |
Volume level and audio quality depend on the source file. Recording duration varies with Flash memory size.
Functional Description
| Function | Operation | Description |
|---|---|---|
| Slide Switch | ON = power on, OFF = power off | Removing the insulation tab turns on the module; inserting it turns it off |
| Light Sensor | Light → play recording; Dark → stop | Plays recorded audio when light is detected, stops when covered |
| Play/Stop Button | Short press to play/stop | Plays the recorded audio or stops playback |
| Record Button | Short press to start/stop recording | Voice prompts: “Start Recording” → record; “End Recording” → stop |
| Type‑C Port | Connect for charging or U‑disk upgrade | Supports firmware updates via U‑disk (HEX file) and battery charging |
| Bluetooth | Wake module → connect to “WT2605AERC” | Connection tone: “ding”; Disconnect tone: “dong dong” |
Recording & Bluetooth Usage
Bluetooth: Wake the module (light or switch), then connect to “WT2605AERC” on your phone. The module enters sleep 30 seconds after playback ends.
Recording:
- Wake module and connect via Bluetooth (set phone volume to max for best quality).
- Short‑press REC button → voice prompt “Start Recording” → REC LED flashes.
- Recording modes: (1) During Bluetooth music playback, press REC to record the music; (2) Press REC while music is playing to record.
- Short‑press REC again or recording reaches max duration → “End Recording” prompt → LED stops flashing (solid green).
Default storage: 2MB (16Mbit) Flash, ~78 seconds recording time (~26 KB/s).
Firmware Upgrade via U‑Disk
- Copy the HEX firmware file (provided by Waytronic) to a U‑disk.
- Connect the module to the upgrade board via USB, then plug in the U‑disk.
- Press and hold both Play and REC buttons for 3 seconds → “dong dong” tone indicates upgrade mode.
- Wait for the upgrade to complete – a “test voice” prompt confirms success.
WT2605A Bluetooth Music Module Applications
Why Choose WT2605A Bluetooth Music Module
FAQs
What is the WT2605A Bluetooth Music Module?
A versatile DIY audio module with Bluetooth 5.0, MP3 playback, voice recording, and light‑sensitive trigger for cards, gift boxes, and speakers.
How does the light sensor work?
When the WT2605A Bluetooth Music Module detects light (e.g., a card is opened), it plays the recorded audio. When covered or in darkness, it stops.
What is the standby current?
≤10µA, allowing for long standby time in battery‑powered applications.
How long can WT2605A Bluetooth Music Module record?
Approximately 78 seconds with the default 2MB Flash (16Mbit). Recording time increases with larger Flash.
What power sources are WT2605A Bluetooth Music Module supported?
Type‑C 5V, 3.7V Li‑ion battery, or 3×1.5V button cells.
Can I update the firmware?
Yes, via U‑disk upgrade – copy the HEX file to a U‑disk and press Play+REC for 3 seconds.
How do I connect via Bluetooth?
Wake the module, then search for “WT2605AERC” on your phone and pair.
What is the recording file format?
The module records in MP3 format with a bitrate of ~26 KB/s.
Note: For best recording quality, set your phone volume to maximum before recording. The module automatically enters sleep mode 30 seconds after playback ends – wake it again to re‑connect Bluetooth. Type‑C cables must support data transfer for firmware upgrades (some cables are charge‑only).
