Bluetooth HC-05

Bluetooth hc-05 module
the hc-05 is a bluetooth module designed for wireless communication between microcontrollers, computers, and mobile devices. it operates on the bluetooth 2.0 standard with edr (enhanced data rate) and supports both master and slave modes. the module is widely used in robotics, iot, and embedded systems to enable wireless serial communication over uart.

hc-05 is easy to interface with microcontrollers like arduino, raspberry pi, and esp8266, making it a popular choice for wireless projects. it has a built-in led indicator for status display and at command support for configuration.

specifications of bluetooth hc-05
general features
-bluetooth version: 2.0 + edr (enhanced data rate)
-operating modes: master and slave
-communication interface: uart (rx/tx)
-default baud rate: 9600 bps (can be configured using at commands)
-supported protocols: spp (serial port profile)
-range: up to 10 meters (in open space)
-frequency: 2.4 ghz ism band
power requirements
-operating voltage: 3.3v - 5v (logic level: 3.3v)
-operating current: 30 ma (approx.)
-power consumption: low-power operation
physical and pin configuration
-dimensions: 37mm × 15mm × 2.5mm
-pins:
-vcc: power supply (3.3v - 5v)
-gnd: ground
-txd: transmit data (uart)
-rxd: receive data (uart)
-en/key: mode selection (used for at command mode)
modes of operation
-master mode: can initiate connections with other bluetooth devices.
-slave mode: can only accept connections from master devices.
-at command mode: used for configuring the module (baud rate, name, password, etc.).
applications
-wireless communication with microcontrollers
-home automation systems
-robotics and iot projects
-bluetooth-based data transfer
-remote control applications