Upon a successful connection, the module usually emits an audible chime or sound to confirm it is ready to play music.
| Parameter | Value | |-----------|-------| | | 2.0 + EDR or 2.1 + EDR (backward compatible with 1.2) | | Frequency Band | 2.4 GHz ISM (2402–2480 MHz) | | Modulation | GFSK (Gaussian Frequency Shift Keying) | | RF Power (Class 2) | -6 dBm to +4 dBm (typical 0 dBm) | | Receive Sensitivity | -80 dBm to -85 dBm (depending on vendor) | | Data Rate (UART) | 9600 bps to 1.3824 Mbps (default 9600, 8N1) | | Air Data Rate | Up to 2.1 Mbps (EDR) | | Operating Voltage | 3.0V – 3.6V (absolute max 3.9V, not 5V tolerant) | | Current Consumption | Tx: ~30 mA, Rx: ~25 mA, Standby: < 1 mA (Deep sleep: < 10 µA for BLE variant) | | Interface | UART (TX, RX, RTS, CTS optional), GPIO, State LED | | Antenna | On-board PCB trace antenna (gain ~1 dBi) | | Range (LOS) | 10 meters (typical indoor), up to 20 meters (open field) | | Form Factor | 27 mm x 13 mm x 2.5 mm (typical) | | Pin Pitch | 2.54 mm (compatible with breadboards and 0.1" headers) |
The system frequently supports taking calls, allowing you to answer via the sensor button and resume music automatically when the call ends. Troubleshooting and Maintenance To ensure the longevity of your BL12A3 Bluetooth Go to product viewer dialog for this item. system, adhere to these maintenance tips:
: Ensure the main power to the mirror or furniture unit is switched on.
speaker. It provides decent clarity for casual listening (like morning routines or podcasts), but lacks the deep bass found in dedicated audio hardware from brands like Lighting Control : The mirror versions usually offer 3 LED color modes bl12a3 bluetooth full
This is a compact, waterproof Bluetooth speaker board primarily designed for integration into products like smart bathroom mirrors or cabinets. Often branded by CAEA, its specifications include:
(Warm, Natural, Cool) with adjustable brightness via touch sensors on the mirror's surface. Connectivity
Installing the BL12A3H is a straightforward process. Whether you're a DIY hobbyist adding Bluetooth to a project or an installer integrating it into a smart home system, these steps will guide you through it.
This comprehensive guide breaks down everything you need to know about the BL12-A3 Bluetooth receiver system, detailing its technical specifications, connectivity steps, performance characteristics, and standard troubleshooting protocols. Technical Specifications & System Architecture Upon a successful connection, the module usually emits
The module operates efficiently on a standard 5V USB rail or a 3.7V Lithium-ion polymer (LiPo) battery. This flexibility allows for both portable battery-powered designs and permanent desktop audio installations. Step-by-Step Installation Guide
| Specification | Details | | :--- | :--- | | | BL12A3H | | Working Voltage | DC12V | | Working Current | 500mA (Max) | | Bluetooth Version | 4.1 | | Wireless Transmission Range | > 10 meters (33 feet) | | Frequency Range | 2.400 - 2.480 GHz | | Transmission Power | 7dBm (Max) | | Audio Signal-to-Noise Ratio (SNR) | > 90dB | | Distortion | < 1% | | Output Power | 3W x 2 @ 4Ω | | Power Input Interface | 5.6 x 2.0mm DC jack | | Dimensions | 101 x 45 x 25 mm | | Data Source | Product Specifications |
Search for "BT-SPEAKER" or similar on your phone. If it won't connect, hold the Mode button to reset the connection.
The BL12A3 is a Class 2 Bluetooth module designed primarily for data transmission in embedded systems. Unlike audio-centric modules (such as those based on the CSR8670 for high-fidelity sound), the BL12A3 focuses on reliable serial cable replacement. It is typically based on a mature Bluetooth 2.0/2.1 + EDR (Enhanced Data Rate) or, in some variants, a Bluetooth 4.0 BLE (Bluetooth Low Energy) chipset—depending on the specific revision purchased from different third-party vendors in the Shenzhen ecosystem. system, adhere to these maintenance tips: : Ensure
Open the Bluetooth settings on your phone or laptop.
Often includes a built-in FM receiver, though tuning can sometimes be challenging. 4. Battery Life and Charging
Average playtime is 3–5 hours at moderate volume.
The design aims to prevent ear fatigue and pain during long sessions, using lightweight materials and adjustable, flexible earhook components.
Integrated 16-bit stereo Digital-to-Analog Converter (DAC) and Analog-to-Digital Converter (ADC) for high-quality voice and music processing.
: Designed to support Bluetooth Low Energy (BLE), making it ideal for battery-powered devices that need to run for long periods without recharging. Easy Integration