Bl12-a3 Bluetooth Info

Note: After changing baud rate, your serial terminal must match the new rate before further commands.

The BL12-A3 is often chosen over HC-05/HC-06 because modern smartphones increasingly drop support for Classic Bluetooth SPP, while BLE remains universally supported. Compared to HM-10, the BL12-A3 is more cost-effective and pin-compatible in many cases. bl12-a3 bluetooth

To enable multipoint, pair the headset with Device A, turn off the headset, then pair with Device B. Turn the headset off and on again—it will automatically connect to both. Note: After changing baud rate, your serial terminal

The BL12-A3 is a mono, over-the-ear Bluetooth headset designed primarily for voice communication. Unlike stereo headphones meant for music immersion, the BL12-A3 focuses on crystal-clear call quality, long-wearing comfort, and ease of use. It is frequently compared to industry staples like the Plantronics (now Poly) Voyager series but offered at a fraction of the price. To enable multipoint, pair the headset with Device

| Parameter | Value / Range | |-----------|----------------| | | 4.0 (BLE - Bluetooth Low Energy) | | Frequency Band | 2.4 GHz ISM (2402–2480 MHz) | | Transmit Power | -20 dBm to +4 dBm (configurable) | | Receiver Sensitivity | -93 dBm (typical) | | Operating Voltage | 3.0V – 3.6V (3.3V nominal, NOT 5V tolerant ) | | Current Consumption | Standby: ~1.5 µA Active (Tx/Rx): 8–15 mA | | Data Rate | UART: 9600 bps (default), up to 115200 bps BLE: 1 Mbps | | Interface | UART (Tx, Rx), RTS/CTS (optional flow control) | | Range (open air) | 10–30 meters (class 2 device) | | Antenna | Onboard PCB trace antenna | | Dimensions | Approx. 27 mm × 13 mm × 2 mm | | Operating Temperature | -20°C to +70°C |