Description

This bluetooth module is a working alternative for HC-05 or HC-06 at affordable price!

This module utilizes UART serial interface protocol, so it can support SPP bluetooth serial protocol. It is designed to be low-cost, small, low power consumption but has high sensitivity in receiving signals.

Features

• Use Bluetooth version 2.1 + EDR
• Bluetooth Class 2
• Built-in PCB transceiving antenna
• Supports UART interface
• Operating at 3.3V

Specifications

Operating Frequency Band	2.4 – 2.48 GHz unlicensed ISM band
Bluetooth Specification	V2.1 + EDR
Output Power Class	Class 2
Operating Voltage	3.3V
Host Interface	UART
Operating Temperature	-40 to +150?C
Supply Voltage for VCC pin	5.6V (max)
Operating Baud Rate	38400/115200 bps

Notes

Only apply for RX pin on the bluetooth module, Arduino boards such as Uno, Nano and Mega board or other microcontrollers output 5V at their I/O pins. You need to use a voltage divider (1K + 2K resistor network) or logic level shifter to step down the 5V signal from microcontroller to 3.3V before feed it into RX pin on bluetooth module. TX pin on the bluetooth module outputs 3.3V signal and Arduino can perceive this voltage as HIGH, so stepping up this signal voltage is not required.

Additional Information

TXD : Transmitter pin, this pin must connect to RX pin of next device

RXD: Receiver pin, this pin must connect to TX pin of next device

There are 6 pins on this module, namely EN, VCC, GND, TXD, RXD, STATE. When the module is paired connection to a device (such as mobile phone), STATE pin will output HIGH, otherwise it will output LOW signal.

The built-in LED on the module indicates the bluetooth connection,

LED Blink Status	Meaning
Slowly	Waiting for connection…
Always on	Connected

Bluetooth signal strength can be significantly affected by the surrounding especially the conductivity of surfaces. Installing the bluetooth module within metal enclosures can severely affect the bluetooth signal. Avoid placing metallic object, surfaces or wire near the PCB antenna on the module. It can severely affect the module’s ability to receive signals.

Files & Information

• Datasheet
• Blog