BLUETOOTH MODULE MODEL-HC-05

Specification: The HC-05 Bluetooth module is a low-cost wireless communication device used to establish serial communication between microcontrollers (such as Arduino, PIC, AVR, and 8051) and Bluetooth-enabled devices like smartphones, tablets, and computers. It uses the Bluetooth v2.0 + EDR (Enhanced Data Rate) standard and communicates through a UART (Universal Asynchronous Receiver/Transmitter) interface.

One of the key advantages of the HC-05 is that it can operate in both Master and Slave modes, making it suitable for a wide range of wireless embedded system applications such as robotics, home automation, wireless data logging, and remote-control systems. The module can also be configured using AT commands to change parameters such as baud rate, device name, password, and operating mode.

Technical Specifications

·         Bluetooth Version: Bluetooth v2.0 + EDR

·         Operating Frequency: 2.4 GHz ISM Band

·         Communication Interface: UART (Serial Communication)

·         Operating Voltage: 3 V to 6 V DC (breakout board)

·         Logic Level: 3.3 V TTL

·         Operating Current: 30–50 mA (typical)

·         Standby Current: < 2.5 mA

·         Communication Range: Approximately 10 m (Class 2)

·         Data Rate: Up to 2.1 Mbps (asynchronous)

·         Default Baud Rate: 9600 bps (Data Mode), 38400 bps (AT Command Mode)

·         Configurable Baud Rates: 1200 to 1382400 bps (firmware-dependent)

·         Operating Modes: Master and Slave

·         Security: Authentication and Encryption

·         Supported Profile: Serial Port Profile (SPP)

·         Operating Temperature: −20°C to +75°C

·         Dimensions (module): Approximately 27 × 13 × 2 mm

Pin Configuration

·         VCC: Power supply (3.3–6 V)

·         GND: Ground

·         TXD: Transmits serial data

·         RXD: Receives serial data

·         EN/KEY: Enables AT command mode

·         STATE: Indicates connection status