Keyestudio HC- 05 Bluetooth Transmission Module for Arduino Bottom Master slave

The Keyestudio HC-05 Bluetooth Transmission Module is a versatile wireless serial communication solution designed for Arduino and other microcontroller projects. It is ideal for students, educators, and makers looking to replace physical serial cables with a reliable wireless link of up to 10 metres. The module handles complex Bluetooth protocols automatically, allowing for straightforward integration into your builds.

Cable-free serial communication

This module allows you to eliminate physical serial cables and establish a wireless serial link over a range of up to 10 metres. It simplifies your projects by handling the complex underlying Bluetooth protocol automatically.

Simple AT command configuration

Configure the module easily using just four essential AT commands for communication testing, name changing, baud rate adjustment, and password pairing. These commands are sent directly via the physical TXD and RXD pins using any standard microcontroller or a PC serial connection.

Multi-platform microcontroller compatibility

The module integrates seamlessly with a wide range of hardware platforms, including 51, AVR, PIC, msp430, and ARM microcontrollers. You can also connect it to a computer using a USB-to-serial adapter or MAX232 interface.

Clear interface pinout and status

The board breaks out essential pins including VCC, GND, TXD, RXD, KEY, and the STATE pin. The STATE pin outputs a low signal when disconnected and switches to high once a successful Bluetooth connection is established.

Visual LED status feedback

An onboard LED provides immediate visual feedback on the module's connection state. A quick flash indicates no connection, a slow flash shows it has entered AT configuration mode, and a double flash confirms a successful Bluetooth connection.

Video demonstration and setup

Watch a practical demonstration of the Bluetooth module in action to help guide your initial setup and configuration. Refer to the manufacturer's video guide for step-by-step visual instructions.