The Bluetooth Module HC-05 is a powerful tool for wireless communication between microcontrollers and Bluetooth-enabled devices. Whether you’re automating your home, building a robot, or controlling a smart device — the HC-05 module helps you get there without messy wires or complicated setup.
What is the HC-05 Bluetooth Module?
The HC-05 module is a class 2 Bluetooth serial transceiver designed for wireless communication using the Serial Port Profile (SPP). It works in both Master and Slave modes, which makes it more versatile than the HC-06. From beginner-friendly projects to industrial prototypes, this module handles it all.
Key Features of Bluetooth Module HC-05
- Supports Master & Slave modes
- Built-in AT Command Mode for configuration
- Range: Up to 10 meters (line of sight)
- Fully compatible with Arduino, STM32, and more
- Easy pairing with Android and Windows
- Default Baud Rate: 9600 (can be configured)
- Compact, lightweight design with onboard LED indicators
Why Choose HC-05 for Wireless Communication?
- Flexible Use Cases: Control, monitor, or log data — all wirelessly
- Easy to Program: Seamless integration with Arduino IDE and serial tools
- Stable and Fast: Smooth two-way data transfer with minimal delay
- Perfect for DIY and Commercial Use: Robotics, home automation, smart lighting, wireless monitoring
- Highly Compatible: Works with laptops, PCs, and smartphones
Technical Specifications – HC-05 Datasheet Summary
| Specification | Details |
|---|---|
| Bluetooth Version | 2.0 + EDR |
| Operating Voltage | 3.3V to 6V |
| Communication Protocol | UART (9600 default baud) |
| Operating Mode | Master & Slave |
| Communication Range | Up to 10 meters |
| Interface Level | 3.3V TTL |
| Onboard LED | Shows status and connection |
| Dimensions | Approx. 27mm x 13mm |
HC-05 Bluetooth Module Applications
- Arduino Bluetooth Projects
- Wireless Sensor Networks
- Home and Industrial Automation
- Remote Control of Electronics
- Robot-to-Controller Communication
- Wireless Data Logging
Story: Why HC-05 Makes Projects Come Alive
Imagine you’re in your workspace in Islamabad, building a smart irrigation system. You don’t want to run wires across the garden or keep pulling out cables for programming. With the HC-05 Bluetooth module, your phone becomes your controller. Send commands, get feedback, update settings — all without touching the hardware.
That’s the freedom HC-05 delivers.
HC-05 Connections and Pinout
- VCC – 3.3V–6V supply
- GND – Ground
- TXD – Transmit Data (connect to RX of MCU)
- RXD – Receive Data (connect to TX of MCU)
- KEY / EN – Enters AT mode when pulled high before power-up
- STATE – Shows connection status
Quick to wire, quick to go live.
Setting Up the HC-05 Bluetooth Module
Using AT commands, you can configure your module’s role (Master/Slave), set baud rate, rename the device, and add password security. Many developers in Pakistan use this to connect multiple Arduino units or build multi-device networks with stable communication.
HC-05 vs HC-06 – Why HC-05 Wins for Versatility
If you want a module that works as both Master and Slave, then HC-05 is the right choice. It’s especially useful for two-way communication projects and supports greater control through AT commands than HC-06.
Why Buy Bluetooth HC-05 Module from Colgroad?
- Affordable pricing and fast delivery in Islamabad
- 100% genuine components tested before shipment
- Technical support for setup and tutorials
- Ideal for students, engineers, and hobbyists
Order the HC-05 Bluetooth Module Today
Bring wireless communication to your microcontroller. With the HC-05 Bluetooth module, control and monitor your electronics from your phone, laptop, or other smart devices. Order now and make your project smarter, simpler, and wireless.
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