HC-05 Bluetooth Module for Wireless Communication ProjectsSKU 2030

Sensors & Modules

HC-05 Bluetooth Module for Wireless Communication Projects

₹299

01 — About

What it does

The HC-05 Bluetooth Module for Wireless Communication Projects enables serial wireless communication between microcontrollers and Bluetooth-enabled devices. It supports both master and slave modes for flexible connectivity in IoT, robotics, and automation projects.

Key features

  • Bluetooth 2.0 + EDR for reliable wireless serial communication
  • Master and slave mode configurable via AT commands
  • UART TTL interface at 9600 baud (default)
  • 3.3V-5V operation with onboard voltage regulator
  • Built-in antenna with ~10 meter range
  • Easy pairing with smartphones and computers
  • AT command support for configuration

Good to know

  • HC-05 uses 3.3V logic on RX pin – use voltage divider from 5V Arduino
  • Default pairing password is typically ‘1234’ or ‘0000’
  • Enter AT mode by holding KEY pin HIGH during power-on
  • Use SoftwareSerial on Arduino to free hardware serial for debugging
  • HC-06 is slave-only; HC-05 can be both master and slave

02 — Datasheet

Specifications

09
Model
HC-05 (ZS-040)
Bluetooth Version
2.0 + EDR
Interface
UART TTL
Default Baud Rate
9600
Operating Voltage
3.3V – 5V (module regulated)
Logic Level
3.3V (5V tolerant on RX)
Range
~10 meters (class 2)
Profiles
SPP (Serial Port Profile)
Dimensions
28mm x 15mm