Bluetooth 2.0 Serial Communication Module V3 (UART, SPP)
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Description
The Bluetooth 2.0 Serial Communication Module V3 is a compact wireless serial transceiver powered by the CSR BC417143 chipset and Bluetooth v2.0 + EDR. Designed for transparent UART data links using the Serial Port Profile (SPP), it seamlessly connects microcontrollers to laptops, Bluetooth dongles, and Android devices. It is an ideal wireless cable replacement for students, hobbyists, and educators working on robotics telemetry and remote prototyping.
Robust dual-board construction
A stacked double-board layout improves physical durability and shields delicate components from electrostatic discharge during benchtop wiring. An integrated onboard antenna ensures stable RF transmission across a 20 to 30 metre free-space range without requiring external antennas.
Transparent serial communication
Utilising the Bluetooth Serial Port Profile (SPP), the module delivers transparent bidirectional UART communication between microcontrollers and host devices. It supports configurable baud rates from 4800 to 1382400 bps, with a standard factory default of 9600 bps.
Flexible power and hardware configuration
The module supports dual power input options, including a wide 3.5V to 8V DC range alongside a dedicated 3.3V supply. An integrated DIP switch provides instant access to AT command mode for parameter configuration, as well as an LED-off mode for low-power operation.
Clear visual status indicators
Onboard STATE and LINK LEDs offer immediate visual feedback on wireless activity. The STATE indicator uses specific flashing frequencies to signal searching and connection phases, while the LINK LED illuminates steadily once pairing is established.
Versatile embedded compatibility
Operating in the 2.4 GHz ISM band with Class 2 transmit power, this module provides reliable short-range data transfer for diverse setups. It is well suited for mobile-controlled robotics, wireless sensor telemetry, and classroom electronics experimentation.
Downloads & documentation
Specifications
| The Bluetooth chip | CSR BC417143 |
| Bluetooth protocol | Bluetooth Specification v2.0 + EDR |
| USB Protocol | USB v1.1/2.0 |
| Operating frequency | 2.4 ~ 2.48GHz unlicensed ISM band |
| Modulation | GFSK (Gaussian Frequency Shift Keying) |
| Transmit Power | ≤ 4dBm, Class 2 |
| Transmission distance | 20 ~ 30m in free space |
| Sensitivity | ≤-84dBm at 0.1% BER |
| Transfer rate | Asynchronous: 2.1Mbps (Max) / 160 kbps; Synchronous: 1Mbps/1Mbps |
| Safety features | Authentication and encryption |
| Support profiles | Bluetooth serial port |
| Serial port baud rate | 4800 ~ 1382400 / N / 8 / 1 default: 9600 |
| LED indicator | STATE state: Search state (high 104ms 342ms 2.9Hz cycle flicker) connection status (high 104ms cycle 2s 0.5Hz flashing), LINK Status: Always after match |
| Input Voltage | +3.5 V ~ +8 V DC and 3.3V DC/50mA |
| Working temperature | -20 ℃ ~ +55 ℃ |
| Module Size | 40 × 20 × 13mm(1.6x0.8x0.5'') |
In the box
| DFRobot Bluetooth V3 | 1 |
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