BT-06 Bluetooth 2.1 UART Module — HC-06 Compatible, TTL Serial, 3.3V, Arduino

BT-06 Bluetooth 2.1 UART Module HC-06 Compatible, TTL Serial, 3.3V, Arduino

$7.40 USD

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BT-06 Bluetooth 2.1 UART Module — HC-06 Compatible, TTL Serial, Arduino

The BT-06 is a Bluetooth 2.1 Classic serial module compatible with the popular HC-06 — providing wireless UART serial communication between Arduino and smartphones, PCs, or other Bluetooth devices. It appears as a virtual serial port on the connected device, making it a transparent wireless replacement for a USB cable. Configure baud rate, device name, and PIN via AT commands. Works with Android Bluetooth terminal apps and Windows Bluetooth serial port.

Module Specifications

Model: BT-06 (HC-06 compatible)
Bluetooth Version: 2.1 + EDR
Mode: Slave only (waits for master device to connect)
Interface: TTL UART (TX, RX, VCC, GND)
Supply Voltage: 3.3V (use voltage divider on RX if connecting to 5V Arduino TX)
Default Baud Rate: 9600 baud (configurable via AT commands)
Default PIN: 1234
Package: SMD module with 4-pin header

Arduino Wiring

VCC → 3.3V | GND → GND
BT-06 RX → Arduino TX (via 1kΩ/2kΩ voltage divider if using 5V Arduino)
BT-06 TX → Arduino RX (direct — 3.3V is readable by 5V Arduino)
Use SoftwareSerial on Uno/Nano to free hardware UART for USB debugging

BT-06 / HC-06 vs HC-05

BT-06 / HC-06 (this module): Slave only — connects to phone/PC master device
HC-05: Master + slave — can initiate connections to other BT devices
Choose HC-06/BT-06 for phone-to-Arduino communication; HC-05 for Arduino-to-Arduino