Bluetooth Shield + Arduino Uno not discoverable!

[ramaekers.pieter]

Thanks a lot strigoi !!

After searching the net for more than 2 hours your code plus explanation did the trick I now am able to connect my Smartphone (Sony Xperia Z) to the Arduino UNO R3 using the Seeedstudio BT Shield.

I am having another question now about it though,… now the problem with the double blinking of LED D1 (green) I have AFTER disconnecting an APP on my Smartphone. Let me describe it in steps:

• Disconnect the Arduino UNO from the power supply (in my case the connection with the PC)
• Upload the code (the one down here from strigoi) to the Arduino UNO R3
• After the upload process, LED D1 on the BT Shield makes a double blink 2 times. After that LED D1 and D2 (red) start to blink alternately.
• On the Smartphone open the APP with which you want to connect the shield. In my case I used: Bluetooth SPP Pro. Scan for new devices → the SeeedBT shield will pop up. Connect to it using the standard code 0000.
• Now only D1 will blink every second 1 time. Also when you connect a LED to port A1 it will now be ON.
• In the “Byte Stream Mode” of the APP I now can send a 0 or a 1 to the shield which will put OFF or ON LED 13 on the Arduino UNO.
  === Up till here everything works perfectly!
• Next thing I do is closing the APP on my Smartphone → LED connected to A1 goes OFF, which it should because there is no connection anymore between the Shield and another device. BUT now D1 (green) on the Shield makes the double blink again every second, and there is NO chance anymore to reconnect to the shield again → It is not visible anymore on my Smartphone.

How can I solve this that after the Shield gets disconnected it can be reconnected at another moment in time? I would expect the behavior as follows: when disconnecting the APP from the Shield, LEDs D1 and D2 would start alternating again.

Many thanks in advance!

Pieter

@strigoi8183

For those that are having problems getting BTShield to work properly This is what I have done to get it to function as wanted…

#include <SoftwareSerial.h>   //Software Serial Port
#define RxD 6
#define TxD 7
#define DEBUG_ENABLED  1
SoftwareSerial blueToothSerial(RxD,TxD);
int led = 13;
void setup() 
{ 
  Serial.begin(9600);
  pinMode(led, OUTPUT); // led onboard arduino uno pin 13
  pinMode(RxD, INPUT);
  pinMode(TxD, OUTPUT);
  setupBlueToothConnection();  
} 

void loop() 
{ 
  char recvChar;  
  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);
  }  
  // ADD Code HERE:
  if (recvChar == '0' ) // if input from serial is = 0
  {
    digitalWrite(led, LOW); // turn off led on arduino uno pin 13
    delay(45);
  }
  if (recvChar == '1') // if input from serial is = 1
  {
    digitalWrite(led, HIGH); // turn on led on arduino uno pin 13
    delay(45);
  }
}  
void setupBlueToothConnection()
{
  blueToothSerial.begin(38400); //Set BluetoothBee BaudRate to 38400 ..default baud rate 38400 (btShield plays nicely at default baud rate)
  blueToothSerial.print("\r\n+STWMOD=0\r\n"); //set the bluetooth work in slave mode
  blueToothSerial.print("\r\n+STNA=SeeedBT\r\n"); //set the bluetooth name as "SeeedBT"
  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
  blueToothSerial.print("\r\n+STPIN=0000\r\n");//set pin to 0000
  blueToothSerial.print("\r\n+RTPIN=0000\r\n");// ask to input pin
  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();
}

All I did was attach BT shield to arduino then upload code unplug arduino wait 5 seconds replug the arduino and wait for red and green led to blink alternatively…Normally takes 3-5 secs to initiate… Once leds are blinking then you should b able to connect with other device to seeedBT… for (windows 7) i found that once you upload code unplug arduino and replug arduino back in that if you open the serial monitor in arduino ide windows will pop up a alert box saying (A bluetooth device is trying to connect click here to allow) once you click the alert it will ask for pincode, which is 0000 . Once entered all should be well in BT land and you should be able to enter 0 or 1 in serial monitor and watch led onboard arduino turn on/off…enjoy