Where did you initialise serial data speed on Bluetooth device?
Cyclegadget is right - it's either when pairing or whenever connection is established
Even if baud rate was wrong you'd still receive something - if you don't then it has to be something else.
Verify if the module and the mobile works using a USB bluetooth dongle and a program like putty. Also check the datasheet of the module and the settings - is the module set as slave or master ? For apps I created it has to be set as master
Thanks for sharing your work. I tried it without voice detection. BT is paired with my phone but apperently no serial data is send. If I try to send "1" or "2" with my computer connected in bt, using putty the led switch on and off correctly so the hardware and arduino sketch is ok. my problem is coming from app inventor. what is button 1 set and number for? is the real value 1 and 2 are send or ascii value. I tried with mega 2560 with external power and connect rx and tx to serial 0
@sisyph
I recommend you share your code that you are using, just to eliminate the possibility of the code being the problem.
ohh I see now... the problem you are experiencing is caused by data types
The app sends bytes so it converts '1' into '49' and that's what's sent through bluetooth.
Ohh and you really should have connected the app to the bluetooth dongle - that would make everything clear for you.
Yeah !! it works.
I used in my sketch : case '1' : instead of case 1:
So many hours for ''...
The strange things is that it worked before when I used my bt connection with my computer...
Thanks for your help
Just found this app. Those who are interested can check out ArduinoCommander android app too:
https://play.google.com/store/apps/details?id=name.antonsmirnov.android.arduinocommander
hi kerimill,
i wanna buy a bluetooth for this project.so just went through ebay and found this link
this bluetooth module has a pairing code 1234. so to pair this module with ur app, should i modify ur project?? will it automatically ask for code??
plz tel me that can i use this module??
thnx
Jazly 
The app doesn't have to pair with the module - just pair with it from the phone and then run the app
It should work just fine - just make sure you check the datasheet of the module & make sure the baud rate is the same (if so then the arduino code has to be modified or the setting of the module)
hi , i am interested in such project .. i purchased arduino uno , bluetooth bee , and x bee sheild ..
i am having a problem in bluetoothfor arduino app.. i couldnt figure out on wat program it will run ...
thnk u for ur cooperation ..
I don't really understand the question... could you be more specific ? I know English is probably not your native language but I can't really tell what's the problem
I have a senior project , our instructor couldnt help me , because he siad that arduino and android isnt his domain, and said that it a new tech ,go ask some experts,, so i made plenty of searches but rarely i got info 
in my project i need to control ( turn on and off lights using arduino, android mobile phone , via bluetooth )
i bought an arduino uno , arduino shield (for Bbee ) , bluetoothbee, and relay...
i saw ur codes , but i need u to tell me where to use them .. plz help me if u can..
ive downloaded books but sooo many codes....
MY problem is that in our country we have no experts in arduino, neither android programs..
i tryed to download from speedy share as u suggested , but it was denied , they asked for premium......
can u help , and be an advisor for this project which i couldnt have , plzzz
You have to copy and paste arduino code into arduino IDE and then upload it to the board
You're right about speedyshare - you can no longer download the files for free
I'll try to upload them somewhere else
Here is a link to the files ->
https://docs.google.com/file/d/0B_PfPoEotOF8WEwyUVhkWnY3b00/edit?usp=drive_web&pli=1
or try this if it doesn't work
https://drive.google.com/folderview?id=0B_PfPoEotOF8N2JwT3RSX011SjQ&usp=sharing
thank u ive downloaded the files , but i couldnt copy them to arduino ide,, it didnt open ,, do u have a way to open those files ,, ar any program to open them ???
i have a bluetooth bee iteadstudio ,, but ive seen some codes from seeedstudio for my bluetooth, is it the same ???
i tryed but it didnt work !
http://tronixstuff.wordpress.com/2012/04/30/arduino-android-and-seeedstudio-bluetooth-bee
how can i try it ??
the code for arduino uve prviosly wrote in the first page about pin 7 coudnt be uploaded to arduino ,, problem is because of COM .. but only 3 COMs 4, 5, 7 also didnt work , access is denied ..
whats the problem?? i am using arduino 1.5.2
First of all you can't have the bluetooth module connected to RX and TX when you upload code - upload code and then connect them.
Secondly, the module you have might be set to different default baud rate - you either have to change it (using AT commands) or modify arduino code to use the module default baud rate.
What's more, make sure that the module is set as master. The datasheet should have some information on that.
Finally, use a USB bluetooth dongle and program such as Putty to try to establish connection with the module and android device. In this way you can manually send and receive commands and see if the module and/or android device works as expected.
i uploaded the code it worked ..
as for comunication with bluetooth it didnt happen , i tryed to comunicate with bluetooth by serial monitor .. it didnt work , as for Putty i tryed it it also didnt comunicate , i tryed AT and +++ ,, waiting for an OK .. also nothing happen ..
what baud rate , and com do ITEADSTUDIO bluetooth bee work ????..
kerimil am realy thankful for ur concern
Did you try to establish connection between the phone (app) and a computer to see if it works ?? it should work just fine.
i tryed to comunicate with bluetooth by serial monitor .. it didnt work , as for Putty i tryed it it also didnt comunicate
even if the baud rate is wrong you still get something on the other side - just a bunch of characters that make no sense
There must be some other problem - I assume it's either wiring or slave/master setting
i tryed AT and +++ ,, waiting for an OK .. also nothing happen
All bluetooth modules that I've seen require you to send AT commands through FTDI adapter not directly through bluetooth SPP.
Not sure if that's the module you have but I found this ->
ftp://imall.iteadstudio.com/IM120417010_BT_Shield_v2.2/DS_BluetoothHC05.pdf
Also I found this thread that you might find useful -> Arduino Forum
thnk u , i only need ur source code for the application on android phone plzz .. i gues i figured out the problem ,, in the xbee shield its not suppoting a connection betwwen bluetooth rx , and arduinos tx...
so now its responding .. so plz give me ur app source code