arduino- bluetooth - relay


I would like to control my outputs with my android phone. @ this moment im building my own relay shield + an option for bluetooth module. The only big problem I have no knowledge about how to creat a code to get it work. Im new to arduino so i hope there is someone that can help me out.

The way how im going to connect the bluetooth module

Many thank,

you need to create your own 'protocol'

data will be send as a never ending byte array (stream) so you need to be able to find a beginning of a 'command' and it's end. for example if you want to send two bytes, you can make third byte 0x00 as a 'stop byte' if you are sure, that data bytes have no 0 value. more sophisticated protocols could look like this:

two bytes - unique signature
two bytes - length of a datablock
byte[] - data

if you want to steer a relay, so you dont want to send data whole the time, you can make 'commads' for example one byte - unique signature one byte - command one byte - data

so the command would look like this: 0xff 0x01 0x00 - means disable device 1 (your relay) 0xff 0x01 0x01 - means enable device 1 (your relay) 0xff 0x02 0x01 - means enable device 2 (next relay)

No needto create special protocol. You can use StandardFirmata sketch (Firmata protocol) and ArduinoCommander android application -

@4ntoine - Enough with the spamming. Once or twice is fine. You don't need to post this stuff in EVERY thread that mentions Android!

@4ntoine Too much noise about the app, but i must confess that it's cool :P