Joystick bluetooth Commander

maxneo · Joined: 07 Sep 2010 Posts: 35

Hi
I try to use an Android app to run a robot "Joystick bluetooth Commander"
but do not know how I should decoda input data flow.Android app
sends ASCII characters'

The data frame is send via BlueTooth to the arduino board and decoded.
'2' is Ascii 32 hex (decimal 50)
'0' is Ascii 30 hex (decimal 4 Cool

Data frame: <0x02 0x32 0x30 0x30 0x32 0x30 0x30 0x03>
Data is sent as ascii shall I handle it as a close and use the ASC ()

data flow in my terminal Hex

02 31 36 38 31 39 32 03 02 31 36 38 31 39 32 03
02 31 36 38 31 39 32 03 02 31 36 38 31 39 32 03
02 31 36 38 31 39 32 03 02 31 36 38 31 39 32 03

exampel for ardunio
void getJoystickState(byte data[8]) {
int joyX = (data[1]-4 Cool

*100 + (data[2]-4 Cool

*10 + (data[3]-4 Cool

; // obtain an Int from the ASCII representation
int joyY = (data[4]-4 Cool

*100 + (data[5]-4 Cool

*10 + (data[6]-4 Cool

;
joyX = joyX - 200; // Offset to avoid
joyY = joyY - 200; // transmitting negative numbers

link to Joystick bluetooth Commander
https://play.google.com/store/apps/details?id=org.projectproto.btjoystick&feature=search_result
Does anyone have any suggestions?
many greetings Maxneo

(BASCOM-AVR version : 2.0.7.8 )

maxneo · Joined: 07 Sep 2010 Posts: 35

Hi
I try to use an Android app to run a robot "Joystick bluetooth Commander"
but do not know how I should decoda input data flow.Android app
sends ASCII characters'

The data frame is send via BlueTooth to the arduino board and decoded.
'2' is Ascii 32 hex (decimal 50)
'0' is Ascii 30 hex (decimal 48)
Data frame: <0x02 0x32 0x30 0x30 0x32 0x30 0x30 0x03>
Data is sent as ascii shall I handle it as a close and use the ASC ()

data flow in my terminal

02 31 36 38 31 39 32 03 02 31 36 38 31 39 32 03
02 31 36 38 31 39 32 03 02 31 36 38 31 39 32 03
02 31 36 38 31 39 32 03 02 31 36 38 31 39 32 03

exampel for ardunio
void getJoystickState(byte data[8]) {
int joyX = (data[1]-48)*100 + (data[2]-48)*10 + (data[3]-48); // obtain an Int from the ASCII representation
int joyY = (data[4]-48)*100 + (data[5]-48)*10 + (data[6]-48);
joyX = joyX - 200; // Offset to avoid
joyY = joyY - 200; // transmitting negative numbers

link to Joystick bluetooth Commander
https://play.google.com/store/apps/details?id=org.projectproto.btjoystick&feature=search_result
Does anyone have any suggestions?
many greetings Maxneo

albertsm · Joined: 09 Apr 2004 Posts: 6197 Location: Holland

there are multiple ways to do it. you get : 02 31 36 38 31 39 32 03 02 31 36 38 31 39 32 03
which means 02 is the start of the frame and this is what you need to watch for.
the 03 seems to mark the end of a frame. I think you also get CR + LF ?
That would make it simple. Just use INPUT and store the data into a line. Then extract the data using mid()

maxneo · Joined: 07 Sep 2010 Posts: 35

Thanks for the reply Mark, I have tried to use the hex (), Val (), Chr () and it has not been good. It says in the text that should (data [X] -4 Cool

* 100 -48 is well because it is ASCII can not load byte for byte and decod directly? No, now I will test your proposal many thanks Maxneo