HC-05 BLUETOOTH TRANSCEIVER MODULE

TRANSCEIVER MODULE
MODULE
Think it... Make it... Invent!
SKU: PROD0036

The HC-05 Bluetooth Module is a low cost widely available device for creating serial data connections.

HC-05 module is an easy to use Bluetooth SPP (Serial Port Protocol) module, designed for transparent wireless serial connection setup. Serial port Bluetooth module is fully qualified Bluetooth V2.0+EDR (Enhanced Data Rate) 3Mbps Modulation with complete 2.4GHz radio transceiver and baseband. It uses CSR Bluecore 04-External single chip Bluetooth system with CMOS technology and with AFH(Adaptive Frequency Hopping Feature). It has the footprint as small as 12.7mmx27mm. Hope it will simplify your overall design/development

This HC-05 Module is working at 3.3V, but it is fitted on a baseboard that provide voltage regulation for you to input Arduino 5V to Vcc pin of this module.

TECHNICAL DETAILS

Able to be set as a Master or as a Slave via AT commands.
Use the CSR mainstream bluetooth chip, bluetooth V2.0 protocol standards.
Onboard 3.3V regulator chip. Input to Vcc 5V and onboard regulator can regulate it to 3.3V for internal module functioning.
Default baud rate of 9600, the user can change speed via AT commands.
Provide 6 pin labeled as VCC, GND,TXD,RXD,KEY and LED.
Interface level is 3.3V for the TXD and RXD of this module, in fact also advised to use 3.3V logic for the KEY. I had verified KEY working well on 3.3V logic.
For 5V Arduino please use level shifter to shift from 5V TXD of Arduino to 3.3V RXD of this module. But you can direct connect 3.3V TXD of this module to RXD of Arduino because Arduino side can interpret the incoming 3.3V signal.
This module has the KEY pin, it is used for AT Command programming, please google“HC-05 AT Command” to find out more information from internet. I had verified and successfuly issue AT Command using the KEY pin at 3.3V logic level.
LED pin of this module is meant for driving a external LED for status indication purpose. LED pin defaults to high when bluetooth connected, and low when bluetooth disconnected. However you can reprogram it to the reverse way via AT commands. Some user reprogram it to reverse so that when bluetooth connected it is low and use it to act as DTR pin to reset Arduino for remote Arduino programming.
This module has no EN pin as in some other bluetooth module.
After pairing provides a full duplex serial port that support 8 data bits and 1 stop bits and no parity, this is the most common communication format.

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