HC-05 Bluetooth Wireless Communication Module for Arduino
Description:
HC-05 is a Bluetooth module which is designed for wireless communication. This module can be used in a master or slave configuration.
It is used for many applications like wireless headset, game controllers, wireless mouse, wireless keyboard and many more consumer applications.
It has range up to <100m which depends upon transmitter and receiver, atmosphere, geographic & urban conditions.
It is IEEE 802.15.1 standardized protocol, through which one can build wireless Personal Area Network (PAN). It uses frequency-hopping spread spectrum (FHSS) radio technology to send data over air.
It uses serial communication to communicate with devices. It communicates with microcontroller using serial port (USART).
Pin Configuration
Pin Number
Pin Name
Description
1
Enable / Key
This pin is used to toggle between Data Mode (set low) and AT command mode (set high). By default it is in Data mode
2
Vcc
Powers the module. Connect to +5V Supply voltage
3
Ground
Ground pin of module, connect to system ground.
4
TX – Transmitter
Transmits Serial Data. Everything received via Bluetooth will be given out by this pin as serial data.
5
RX – Receiver
Receive Serial Data. Every serial data given to this pin will be broadcasted via Bluetooth
6
State
The state pin is connected to on board LED, it can be used as a feedback to check if Bluetooth is working properly.
7
LED
Indicates the status of Module
Blink once in 2 sec: Module has entered Command Mode
Repeated Blinking: Waiting for connection in Data Mode
Blink twice in 1 sec: Connection successful in Data Mode
8
Button
Used to control the Key/Enable pin to toggle between Data and command Mode
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