Android Question Can somebody HELP ?

SoyEli said:

Hello:





I'm working on a obd2 project and need some help:
With the "at ma"
I get:
8A EA 29 20 A7 00 30
AA EB 60 20 A7 00 E7
E8 FF 10 03 B3
88 25 29 07 00 97
68 49 10 10 56 90
E8 FF 60 03 98
88 3B 10 43 80 0D
48 FF 40 06 03 AC
8A EA 40 A0 9E 50 26
AA EB 60 A0 9E 50 2E
8A EA 10 A0 8C 00 65
8A EA 10 20 8C 00 A5
88 53 10 04 C4
8A EA 10 A0 8C 00 65
4A EA 40 20 91 00 6B
48 FF 40 06 03 AC

What I need to do is find out which is the pid, data etc.
I have been looking at the " en.wikipedia.org/wiki/OBD-II_PIDs‎"
Can't make heads or tails :-(

Can you please HELP ?

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terryn said:

SoyEli,
The ATMA command is "monitor all", meaning it will read all raw data on the bus. It relies on a lot of other parameters and I think you need to know which type of bus you are connected to to interpret it correctly.

I suggest you take a look at the ELM327 data sheet
http://elmelectronics.com/DSheets/ELM327DSH.pdf
This takes quite a lot of study. I hope you have enough time.

Terry

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terryn said:

SoyEli,
I insert the commands that I want to send, into a list and use a thread in a class to send from the list. The same thread has a "NewData" event sub which notifies the main thread of incoming data. When data is received on the main thread, it is interpreted in a long Select sub and displayed by the guages.
Each command must be sent one by one because it is only a serial connection but on most vehicles it is so fast that it looks continuous.
The maximum delay should only be 200ms.
I find this works OK with minimum delay to the UI.

Terry

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I have been on the computer for 3 days

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terryn said:

I sympathise with you because I was in the same position about a year ago.

Three days is a mear blink of the eye, I spent six months searching, studying and experimenting. I am on version 24 and still nowhere near finished.
I have included the full INCOMPLETE project. The code is very scatty and may be hard to follow but you could use the OBDService module without much modification.

I think you might have a busy weekend ahead!

Please compile and test the project before using any of the code because I have'nt worked on this for a while and may have inadvertantly changed something.

Terry

Click to expand...

terryn said:

I sympathise with you because I was in the same position about a year ago.

Three days is a mear blink of the eye, I spent six months searching, studying and experimenting. I am on version 24 and still nowhere near finished.
I have included the full INCOMPLETE project. The code is very scatty and may be hard to follow but you could use the OBDService module without much modification.

I think you might have a busy weekend ahead!

Please compile and test the project before using any of the code because I have'nt worked on this for a while and may have inadvertantly changed something.

Terry

Click to expand...

Dale Lin said:

Hi terryn,

I tested this program, it is work.
But I have a problem:
In OBDService:
BT.ConnectInsecure(Admin,Device,1), this code can connect a smart phone (4.4.2) and work, but can't connect Idea TabA1000-A tablet (4.1.2)
so, I change this code to BT.Connect(Device), and it is work.

Why?

Thank you.

Dale

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terryn said:

Hi Dale,
I think it is a bit hit and miss with either connect method but there is a good explanation here http://www.b4x.com/android/forum/threads/serial-bluetooth.37964/

The best way to connect would be :-
Try BT.Connect
If that fails
Try BT.ConnectInsecure and iterate through say the first five ports


Terry

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terryn said:

Hi Dale,
You could try something like this.

B4X:

Sub Process_Globals
Dim Admin As BluetoothAdmin
Dim BT As Serial
Dim Step As Int
Dim Device As String
End Sub

Sub Activity_Resume
Step = 0
BT.Connect(Device)
End Sub

Sub BT_Connected(Success As Boolean)
If Success Then
    'Start communication
Else
    Step = Step + 1
    If Step > 4 Then Return
    BT.ConnectInsecure(Admin,Device,Step)
End If
End Sub

Terry

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terryn said:

Dale,
I have read that there are up to 60 ports for use in RFCOMM.
The device will allocate the lowest port first so unless your device is using many ports in other coonections, it is unlikely to be more than four or five.
It would also be a very slow process to try more than a few ports.

Terry

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