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 this module with fast delivery across India.

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

Features:

• Bluetooth 2.0 + EDR protocol delivers reliable wireless serial data up to 10 meters range.
• UART communication interface at 9600 bps default baud rate connects directly to microcontroller serial pins.
• Operating voltage of 3.3V to 6V makes it compatible with both 3.3V and 5V boards.

Technical specifications:

Applications:

• Phone-controlled LED project uses this wireless module to switch lights from a mobile app.
• Robot car receives forward and reverse commands sent over Bluetooth from a smartphone.
• Bluetooth HC-05 sends live temperature readings from a sensor to a laptop serial monitor.

Package includes:

• 1 x Bluetooth HC-05 Wireless Module

FAQ

1. What is the Bluetooth HC-05 module and what does it do?

The Bluetooth HC-05 is a wireless serial module (a board that sends data without wires). It connects to a microcontroller over UART and lets two devices communicate wirelessly up to 10 meters apart.

2. What voltage does the hc 05 bluetooth module need to work?

The hc 05 bluetooth module runs on 3.3V to 6V DC. This means it works directly with both 5V Arduino boards and 3.3V microcontrollers without needing a separate power converter between them.

3. How do I connect the Bluetooth HC-05 to an Arduino board?

The Bluetooth HC-05 connects using four wires — VCC, GND, TX, and RX. TX from the module goes to RX on the Arduino. Open the Arduino IDE serial monitor at 9600 bps to test communication quickly.

4. What is the difference between hc 05 bluetooth wireless module Master and Slave modes?

The hc 05 bluetooth wireless module works as a Master (starts connections) or Slave (waits for connections). You switch modes by sending AT commands over the serial line. Check hc 05 bluetooth module price on the StemVolt product page.

5. Can the Bluetooth HC-05 connect directly to a phone or laptop?

Yes. The Bluetooth HC-05 pairs with Android phones and laptops over standard Bluetooth. Use a Bluetooth serial terminal app on the phone side. The pairing PIN by default is 1234 on most HC-05 modules.