The HC-06 Bluetooth serial module is a compact wireless RF transceiver board built to provide a straightforward “wireless UART cable” for embedded systems. It is commonly used to add Bluetooth-based serial connectivity to microcontroller projects where a wired USB-to-TTL adapter would otherwise be required. The HC-06 is typically configured as a Slave device, making it well-suited for pairing with a phone, tablet, PC, or another Bluetooth master that initiates the connection. Once paired, the module bridges data between the Bluetooth link and the UART pins, enabling transparent serial communication for commands, telemetry, configuration menus, and simple data streaming.
The HC-06 Bluetooth serial module is a compact wireless RF transceiver board built to provide a straightforward “wireless UART cable” for embedded systems. It is commonly used to add Bluetooth-based serial connectivity to microcontroller projects where a wired USB-to-TTL adapter would otherwise be required. The HC-06 is typically configured as a Slave device, making it well-suited for pairing with a phone, tablet, PC, or another Bluetooth master that initiates the connection. Once paired, the module bridges data between the Bluetooth link and the UART pins, enabling transparent serial communication for commands, telemetry, configuration menus, and simple data streaming.
This module is designed around a Bluetooth SPP-style serial bridge implementation (exact Bluetooth version/profile behavior can vary by module revision and firmware). In practice, your host controller communicates with the module over UART (TX/RX), and the module handles Bluetooth pairing and link management. Data received over Bluetooth is output on the module’s TXD pin, and data sent into the module’s RXD pin is transmitted wirelessly to the paired device.
Power input is specified as 3.3V–6V for the module board, which typically indicates an onboard regulator on many common breakout versions. However, UART logic levels and pin tolerance can vary by board design. Many HC-06 boards expose 3.3V TTL-level UART signals; some include an RX input divider or partial level shifting, while others do not. For 5V microcontrollers, confirm whether your specific board revision is 5V-tolerant on RXD; when in doubt, use a resistor divider or a proper level shifter to protect the module’s RXD pin. For 3.3V systems (ESP32, many Raspberry Pi UART use cases), direct connection is usually appropriate, but always verify the pinout and logic-level requirements for your exact module.
Configuration is commonly performed using AT commands over UART when the module is not actively connected (exact command set, default baud rate, and supported parameters vary by firmware). Typical configuration tasks include setting the UART baud rate, changing the Bluetooth device name, and adjusting pairing parameters. Because the market includes multiple firmware variants sold under the “HC-06” label, it is recommended to check the datasheet or vendor documentation for your specific module revision.
1x HC-06 Bluetooth UART Module
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