EWM104-BT41 Seried Bluetooth Modules

The EWM104-BT41SX and EWM104-BT41SP ,EWT104-BT41SP are dual-mode Bluetooth wireless modules compliant with Bluetooth 5.4 standard. Featuring a dual-mode (BLE+SPP) design, they combine low power consumption and high compatibility. Operating in the 2.4GHz ISM band, the modules support a maximum transmit power of 8dBm, enabling stable communication up to 200 meters in open environments. Two versions are available: IPEX interface (SX model) and PCB onboard antenna (SP model), meeting antenna requirements for different application scenarios.

Detailed Technical Parameters of Dual-Mode Bluetooth Module

RF Performance

  • Protocol Support: Fully compliant with Bluetooth 5.4 specification, backward compatible with BLE 5.0/4.2 and Classic Bluetooth SPP 3.0.

  • Operating Frequency: 2402-2480MHz, supporting Adaptive Frequency Hopping (AFH) for anti-interference.

  • Transmit Power: 8-level adjustable (-20dBm to +8dBm), with 4dB steps.

  • Receiver Sensitivity: -97dBm@BLE 1Mbps, -93dBm@SPP mode.

  • Data Rate:

    • BLE mode: 1Mbps/2Mbps (new feature in Bluetooth 5.4).

    • SPP mode: Up to 721.2Kbps.

Hardware Interface

  • UART Configuration:

    • Baud rate: 1200bps-3Mbps (default 115200bps).

    • Data bits: 5/6/7/8.

    • Stop bits: 1/1.5/2.

    • Flow control: Supports RTS/CTS hardware flow control.

  • GPIO Expansion:

    • 4 programmable IOs (3.3V level).

    • Supports PWM output (2 channels, frequency adjustable from 1K to 1MHz).

  • Power Management:

    • Operating voltage: 2.0-3.6V (3.3V recommended).

    • Current in low-power mode: 1.2μA (deep sleep).

IoT Application Scenarios of Dual-Mode Bluetooth Module

 Industrial IoT

In industrial sensor networks, the module’s dual-mode capability enables simultaneous connection to PLCs (via SPP) and mobile APPs (via BLE). In an automotive production line case, 20 vibration sensors are networked through this module to achieve:

  • Real-time data upload to industrial computers via SPP (1ms-level latency).

  • Device diagnosis by engineers via BLE mobile APPs.

  • Operation in harsh environments with a temperature range of -40℃~85℃.

Smart Home

The module supports master-slave integrated mode, allowing home gateways to:

  • Act as a slave to receive data from temperature and humidity sensors (BLE mode).

  • Act as a master to control smart sockets (SPP mode).

Medical Devices

Compliant with IEC 60601-1-2 EMC standards, it is used in medical monitoring equipment to:

  • Connect to blood oxygen probes via BLE mode (1Hz data rate).

  • Synchronize data to nurse station computers via SPP mode.

  • Ensure priority transmission of vital sign data through a dedicated data priority queue.