# HC-05 Bluetooth Module TTL

- Link: https://robonixkart.com/product/hc-05-bluetooth-module-ttl/
- Published: 2026-10-02T08:54:37+00:00
- Author: admin

### **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.

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### **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 |

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### **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.

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### **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.

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### **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.