Difference between revisions of "Serial Blutooth Module & Bluetooth Bee"

Revision as of 05:42, 17 September 2012

Overview

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The Bluetooth module is an easy to use module for transparent wireless serial connection setup. Serial port Bluetooth module is fully qualified Bluetooth V2.1+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 AFH(Adaptive Frequency Hopping Feature). Hope it will simplify your overall design/development cycle.

Specifications:

• Bluetooth protocol: Bluetooth Specification v2.1 + EDR
• USB protocol: USB v1.1/2.0
• Frequency: 2.4GHz ISM band
• Modulation: GFSK (Gaussian Frequency Shift Keying)
• Transmit power: ≤ 4dBm, Class 2
• Sensitivity: ≤-84dBm at 0.1% BER
• Rate: 2.1Mbps(Max)/160 kbps(Asynchronous);1Mbps/1Mbps(Synchronous)
• security features: Authentication and encryption
• Support profiles: Bluetooth serial port (master & slave)
• Power Supply: +3.3 VDC 50mA
• Operating temperature: -20 ~ +55 Centigrade

Features

• Support bluetooth standard v2.1 + EDR.
• Supports soft/hardware for master/slave mode setting.
• Through the AT command, yon can set the control parameters of the module and issue orders to the module.
• Working state instructions.
• Suitable for embedded serial transmission wireless alternative.
• On-board efficient antenna.
• Support connecting seven slave equipment.

Application Circuit of Bluetooth module on-board

Master/slave mode setting and other configuration:

master/slave mode setting

The bluetooth module on-board supports setting the master/slave mode by soft or hardware. The method is as follows:

PIO(4)——soft/hardware setting: Low level(or impending) for hardware setting master-slave mode. High level（3.3V）for soft setting master-slave mode.
PIO(5)——master-slave mode setting interface by hardware. 3.3V high level for master mode, GND(or impending) for slave mode.

The PIO(4) on the Bluetooth module has been connected to High level (3.3V) for hardware setting. So toggling the switch on the board to ‘M’ end set the module to the master mode, ‘S’ is for slave mode.

The PIO(4) on the Bluetooth module is impening for software setting. Use the AT command AT+role for setting maste/slave mode.

===State instructions LED===

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Example

The Bluetooth module as the master is connected to a USB to ttl module, the Bluetooth bee as the slave module is stacked on the Bee socket on the V5 expansion shield. The computer send a character ‘a’ via usb to ttl module . After the Arduino have received it via wireless serial communication, it will flash the led on-board and send back a string ‘geeetech’.

int val;
int ledpin=13;
void setup()
{
 Serial.begin(9600);
 pinMode(ledpin,OUTPUT);
}
void loop()
{
 val=Serial.read();
 if(val=='a')
 {
   digitalWrite(ledpin,HIGH);
   delay(250);
   digitalWrite(ledpin,LOW);
   delay(250);
   Serial.println("geeetech");
 }
}

Document

[Bluetooth datasheet] [AT Command]

How to buy

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