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Arduino Bluetooth Shield Source Code and Tutorial

arduino bluetooth shield master to slave

arduino bluetooth shield master to slave

 

This is a tutorial on how to use Arduino Bluetooth shield.

To use this bluetooth shield, you have to plug it on the Arduino Uno board as shown in the image above.

This Bluetooth shield can be programmed to be a master or slave. If Bluetooth shield is programmed into the master, the bluetooth shield will make ‘a name’ for bluetooth connectivity.

In addition, it will set the baudrate and will be looking for signals bluetooth enabled. After finding an active bluetooth signal, This bluetooth shield will try to make the process of “pairing” and if the appropriate settings, then it will be connected.

Here is an example program “Master Bluetooth Shield”

#include <SoftwareSerial.h> // Software Serial Port

#define RxD 6
#define TxD 7
#define DEBUG_ENABLED 1

String retSymb = “+RTINQ=”; // start symble when there’s any return
String slaveName = “;SeeedBTSlave”; // caution that ‘;’must be included, and make sure the slave name is right.
int nameIndex = 0;
int addrIndex = 0;

String recvBuf;
String slaveAddr;

String connectCmd = “\r\n+CONN=”;

SoftwareSerial blueToothSerial(RxD,TxD);

void setup()
{
Serial.begin(9600);
pinMode(RxD, INPUT);
pinMode(TxD, OUTPUT);
setupBlueToothConnection();
//wait 1s and flush the serial buffer
delay(1000);
Serial.flush();
blueToothSerial.flush();
}

void loop()
{
char recvChar;
while(1)
{
if(blueToothSerial.available()) //check if there’s any data sent from the remote bluetooth shield
{
recvChar = blueToothSerial.read();
Serial.print(recvChar);
}
if(Serial.available()) //check if there’s any data sent from the local serial terminal, you can add the other applications here
{
recvChar = Serial.read();
blueToothSerial.print(recvChar);
}
}
}

void setupBlueToothConnection()
{
blueToothSerial.begin(38400); // Set BluetoothBee BaudRate to default baud rate 38400
blueToothSerial.print(“\r\n+STWMOD=1\r\n”); // set the bluetooth work in master mode
blueToothSerial.print(“\r\n+STNA=SeeedBTMaster\r\n”); // set the bluetooth name as “SeeedBTMaster”
blueToothSerial.print(“\r\n+STAUTO=0\r\n”); // Auto-connection is forbidden here
delay(2000); // This delay is required.
blueToothSerial.flush();
blueToothSerial.print(“\r\n+INQ=1\r\n”); //make the master inquire
Serial.println(“Master is inquiring!”);
delay(2000); // This delay is required.

//find the target slave
char recvChar;
while(1)
{
if(blueToothSerial.available())
{
recvChar = blueToothSerial.read();
recvBuf += recvChar;
nameIndex = recvBuf.indexOf(slaveName); //get the position of slave name

//nameIndex -= 1;
//decrease the ‘;’ in front of the slave name, to get the position of the end of the slave address
if ( nameIndex != -1 )
{
//Serial.print(recvBuf);
addrIndex = (recvBuf.indexOf(retSymb,(nameIndex – retSymb.length()- 18) ) + retSymb.length());//get the start position of slave address
slaveAddr = recvBuf.substring(addrIndex, nameIndex);//get the string of slave address
break;
}
}
}

//form the full connection command
connectCmd += slaveAddr;
connectCmd += “\r\n”;
int connectOK = 0;
Serial.print(“Connecting to slave:”);
Serial.print(slaveAddr);
Serial.println(slaveName);
//connecting the slave till they are connected
do
{
blueToothSerial.print(connectCmd);//send connection command
recvBuf = “”;
while(1)
{
if(blueToothSerial.available()){
recvChar = blueToothSerial.read();
recvBuf += recvChar;
if(recvBuf.indexOf(“CONNECT:OK”) != -1)
{
connectOK = 1;
Serial.println(“Connected!”);
blueToothSerial.print(“Connected!”);
break;
}
else if(recvBuf.indexOf(“CONNECT:FAIL”) != -1)
{
Serial.println(“Connect again!”);
break;
}
}
}
}while(0 == connectOK);
}

arduino bluetooth shield slave to computer master tutorial

arduino bluetooth shield slave to computer master tutorial

If you set it as a slave bluetooth shield, then this will be passive. This bluetooth shield will set the baudrate and put a name of bluetooth connectivity.

After that, it will wait until there is a device that finding and trying to ‘pairing itself’. If the settings are appropriate, then both bluetooth device will be connected.

Here is an example program “Slave Bluetooth Shield”

#include <SoftwareSerial.h> //Software Serial Port
#define RxD 6
#define TxD 7

#define DEBUG_ENABLED 1

SoftwareSerial blueToothSerial(RxD,TxD);

void setup()
{
Serial.begin(9600);
pinMode(RxD, INPUT);
pinMode(TxD, OUTPUT);
setupBlueToothConnection();

}

void loop()
{
char recvChar;
while(1)
{
if(blueToothSerial.available())
{//check if there’s any data sent from the remote bluetooth shield
recvChar = blueToothSerial.read();
Serial.print(recvChar);
}
if(Serial.available())
{//check if there’s any data sent from the local serial terminal, you can add the other applications here
recvChar = Serial.read();
blueToothSerial.print(recvChar);
}
}
}

void setupBlueToothConnection()
{
blueToothSerial.begin(38400); // Set BluetoothBee BaudRate to default baud rate 38400
blueToothSerial.print(“\r\n+STWMOD=0\r\n”); // set the bluetooth work in slave mode
blueToothSerial.print(“\r\n+STNA=SeeedBTSlave\r\n”); // set the bluetooth name as “SeeedBTSlave”
blueToothSerial.print(“\r\n+STOAUT=1\r\n”); // Permit Paired device to connect me
blueToothSerial.print(“\r\n+STAUTO=0\r\n”); // Auto-connection should be forbidden here
delay(2000); // This delay is required.
blueToothSerial.print(“\r\n+INQ=1\r\n”); // make the slave bluetooth inquirable
Serial.println(“The slave bluetooth is inquirable!”);
delay(2000); // This delay is required.
blueToothSerial.flush();
}

The Easiest Arduino Uno Bluetooth Shield

arduino bluetooth seeedstudio shield

arduino bluetooth seeedstudio shield

The easiest Arduino Uno Bluetooth shield for your Arduino Uno project is SeeedStudio Bluetooth Shield. Simply by plugging the Bluetooth Shield on your Arduino Uno and it has been ready for use. SeeedStudio bluetooth shield work using serial communication. You can choose two pins from Adruino Uno (from pin D0 to D7) to be used as Software Serial Port – Transmite Data (TX) and Receive Data (RX). You can choose RX and TX pins by sliding ‘jumper pin’ on the port that you want (D0 to D7).

arduino bluetooth seeedstudio shield tutorial

arduino bluetooth seeedstudio shield tutorial

 

Arduino Uno Bluetooth Shield ( SeeedStudio Bluetooth Shield ) Features :

  1. Input Voltage: 3.3V
  2. Baudrate: 9600, 19200, 38400, 57600, 115200, 230400, 460800
  3. Seeeduino/Arduino compatible
  4. Up to10m communication distance in house without obstacle
  5. UART interface (TTL) with programmable baud rate (SPP firmware installed)
  6. Default Baud rate: 38400, Data bits: 8, Stop bit: 1, Parity: No parity
  7. Default PINCODE:”0000”
  8. A full set of configuration commands
  9. On board PCB Antenna
  10. FCC Part 15 Certificated

 

Arduino uno bluetooth shield

Arduino uno bluetooth shield

You can still use all the Arduino pin bluetooth although this shield cover Arduino Uno board.  This Bluetooth shield provides 2 grove connectors (digital and analog) for you to install the grove module.

Pad TypeDescription
PIO1Status instruction port of Bluetooth module can be read by Arduino A1 port: low-disconnected, high-connected.
BT_RXUART Data input of Bluetooth module.
BT_TXUART Data output Bluetooth module.
Two Grove connectorsOne is Digital (D8 and D9), the other is I2C/Analog (A4 and A5).

 

arduino bluetooth shield master to slave

arduino bluetooth shield master to slave

You can set this shield bluetooth become a master or slave. For a tutorial and sample programs (source code program) you can also read on this blog.

arduino bluetooth shield slave to computer master tutorial

arduino bluetooth shield slave to computer master tutorial

You can connect this bluetooth shield with the other one (2 different bluetooth shield).

You can also connect a Bluetooth shield with a laptop or computer.

You can also connect a Bluetooth shield with the smartphone.

arduino bluetooth shield slave to master tutorial

arduino bluetooth shield slave to master tutorial