Bluetooth HC-05 Wireless Module

The Bluetooth HC-05 is a wireless serial communication module (a small board that sends and receives data without wires). It uses the hc 05 bluetooth module standard Bluetooth 2.0 + EDR (Enhanced Data Rate) protocol, which means faster and more reliable data transfer than older Bluetooth versions. The module communicates over UART (a simple serial data line) at a default speed of 9600 bps. It broadcasts on the 2.4GHz ISM band, the same frequency used by most Bluetooth devices around you.

The HC-05 Wireless Module has a feature many beginners miss — it can act as both a Master (the device that starts the connection) and a Slave (the device that waits to be connected). You switch roles using AT commands (short text instructions sent over the serial line). The hc 05 bluetooth module range goes up to 10 meters in open space, though walls and interference can reduce that in practice. The honest trade-off is that Bluetooth 2.0 has lower range and speed compared to modern Bluetooth 5.0 modules, so it suits short-range projects well but is not the right pick for whole-house wireless setups.

The bluetooth hc 05 works with boards like the Arduino Uno, Nano, and Mega using the Arduino IDE. You connect it via UART serial pins and write simple code to send and receive text strings. Students building wireless projects, making robots, and  experimenters all use it regularly. StemVolt provides IoT modules with fast delivery across India.

• Check out the Bluetooth 3.0 Audio Receiver Module with Stereo Output

Features:

• Master and slave role selectable via AT commands over UART interface
• UART TTL interface works at 9600 bps default adjustable baud rate
• Bluetooth 2.0 EDR on 2.4GHz ISM band with up to 10m range
• 3.3V to 6V supply range suits Arduino breadboard and regulated builds
• AT command mode enables full pairing address and baud configuration

Technical specifications:

 Applications:

• Bluetooth HC-05 Module used for wireless Arduino robot phone control
• College project uses hc 05 bluetooth module for serial data transmission
• HC-05 Wireless Module used for two-board Bluetooth sensor data bridge
• Wireless relay control uses bluetooth hc 05 for smartphone switch build
• RC car build uses hc 05 bluetooth module range for 10m control

Package includes:

• 1 x Bluetooth HC-05 Wireless Module