- True 3.3V/5V Dual Compatibility: Built-in TTL signal level conversion allows seamless connection to 3V, 3.3V, or 5V microcontrollers.
- Master/Slave Versatility: Unlike slave-only modules, the XM-15B can initiate connections (Master) or wait for them (Slave), functioning as a complete replacement for both HC-05 and HC-06.
- Industrial-Grade Stability: Features an onboard hardware watchdog to prevent system crashes and a power management chip for stable operation between 3.0V and 6.0V.
- High-Speed Initialization: Completes full module and protocol stack initialization in just 0.3 seconds.
- Protection Circuitry: Integrated anti-reverse protection prevents module damage if the power supply is accidentally connected backward.
- Extended Range: Delivers a maximum transmit power of +10dB, offering reliable communication up to 30 meters in open conditions (up to 60m theoretical).
XM-15B Universal Bluetooth Serial Module – Arduino/HC-05/06 Compatible (3.3V/5V Dual Voltage)
| Bluetooth Version | V2.1 + EDR (Enhanced Data Rate) |
|---|---|
| Input Voltage (VCC) | 3.0V – 6.0V DC |
| Logic Level (I/O) | Compatible with 3V / 3.3V / 5V TTL |
| Operating Current | 4mA – 12mA (Pairing/Standby); ~12mA (Active Communication) |
| Default Settings | Baud: 9600; Pairing Code: 1234; Mode: Slave |
| Frequency Band | 2.4GHz ISM Band |
| Transmit Power | +10dBm (Max) |
| Dimensions | 37.5mm x 15.5mm x 4.0mm |
| Certification | Bluetooth BQB Certified |



- Industrial Data Logging: Wireless reading of utility meters (gas/electric) and industrial field control systems.
- Embedded Development: Seamlessly connects Arduino Uno, Mega, and Nano projects to Android smartphones or laptops.
- Enterprise Procurement: A single-stock solution for businesses that previously required separate HC-05 and HC-06 inventories.
- Remote Automation: Ideal for GPS navigation systems, robotic control, and wireless serial peripherals
The XM-15B is a “Universal” module. While the HC-06 is slave-only and the HC-05 often requires manual 5V-to-3.3V logic conversion, the XM-15B integrates these functions onboard. It can act as both Master and Slave and safely handles 5V logic signals natively.
Yes. The XM-15B includes a built-in level conversion circuit, making its I/O pins fully compatible with 5V logic. You do not need the external resistors typically required for older Bluetooth modules
Yes. Since the module supports Master/Slave switching, you can configure one as a Master and the other as a Slave via AT commands to create a point-to-point wireless serial bridge
The module features anti-reverse protection. Unlike many hobbyist modules that would burn out instantly, the XM-15B is protected against accidental polarity reversal.
When the module is not connected to any device (indicated by a flashing LED), it is automatically in Command Mode. You can send standard AT commands via your serial monitor to adjust settings











