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 CommunicationWorks seamlessly with microcontrollers like Arduino, ESP32, STM32, and Raspberry Pi via UART communication. AT Command InterfaceEasily configure the name, baud rate, password, and mode using simple AT commands. Stable and Secure ConnectionProvides reliable and secure wireless connections with Bluetooth-enabled smartphones, laptops, or other embedded modules. Onboard Voltage RegulatorAccepts 3.6V–6V input safely via onboard 3.3V regulator, simplifying power supply requirements. Benefits Wireless FreedomEliminates the need for wired serial communication, perfect for remote control, data logging, or wireless debugging. Versatile IntegrationIdeal for various applications, from robotics and home automation to wireless sensor networks and DIY electronics. Low Power ConsumptionSuitable for battery-powered or energy-efficient projects, with sleep and idle modes for power management. User-Friendly SetupPlug-and-play compatibility with many development boards and easy-to-use configuration via serial terminal. Applications Wireless Data TransferSend and receive data wirelessly between Arduino or ESP32 and mobile phones, PCs, or other controllers. Home AutomationCreate Bluetooth-controlled smart home devices like switches, lights, or appliances. RoboticsControl robots or automation systems remotely using a smartphone app or PC. IoT ProjectsUse HC-05 to wirelessly connect embedded systems to Bluetooth gateways for local monitoring. Wireless DebuggingMonitor serial data and debug your microcontroller projects without being tethered by cables.
