HC-05 Bluetooth Module – Wireless Serial Communication for Embedded and IoT Projects
The HC-05 Bluetooth Module is a widely used and reliable Bluetooth SPP (Serial Port Protocol) module designed for wireless serial communication between microcontrollers and Bluetooth-enabled devices. Whether you’re building a wireless robot, IoT system, or remote monitoring solution, the HC-05 enables simple, fast, and secure Bluetooth connectivity.
Product Specifications
Feature
Specification
Bluetooth Version
Bluetooth 2.0 + EDR
Communication Protocol
Serial (UART)
Operating Voltage
3.3V (Accepts 3.6V–6V via onboard regulator)
Logic Level
3.3V (use voltage divider for 5V systems)
Baud Rate
Default 9600 (Configurable: 9600 to 138240)
Range
Up to 10 meters
Roles Supported
Master & Slave
AT Command Support
Yes (Enter AT mode for configuration)
Dimensions
38mm x 15mm x 2.5mm
Antenna
Integrated PCB Antenna
Key Features
Dual Mode Support (Master/Slave) Configure the module as either a master to initiate connections, or as a slave to accept connections—offering flexibility in communication setup.
Easy Serial Communication Works seamlessly with microcontrollers like Arduino, ESP32, STM32, and Raspberry Pi via UART communication.
AT Command Interface Easily configure the name, baud rate, password, and mode using simple AT commands.
Stable and Secure Connection Provides reliable and secure wireless connections with Bluetooth-enabled smartphones, laptops, or other embedded modules.
Onboard Voltage Regulator Accepts 3.6V–6V input safely via onboard 3.3V regulator, simplifying power supply requirements.
Benefits
Wireless Freedom Eliminates the need for wired serial communication, perfect for remote control, data logging, or wireless debugging.
Versatile Integration Ideal for various applications, from robotics and home automation to wireless sensor networks and DIY electronics.
Low Power Consumption Suitable for battery-powered or energy-efficient projects, with sleep and idle modes for power management.
User-Friendly Setup Plug-and-play compatibility with many development boards and easy-to-use configuration via serial terminal.
Applications
Wireless Data Transfer Send and receive data wirelessly between Arduino or ESP32 and mobile phones, PCs, or other controllers.
Home Automation Create Bluetooth-controlled smart home devices like switches, lights, or appliances.
Robotics Control robots or automation systems remotely using a smartphone app or PC.
IoT Projects Use HC-05 to wirelessly connect embedded systems to Bluetooth gateways for local monitoring.
Wireless Debugging Monitor serial data and debug your microcontroller projects without being tethered by cables.
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