[owen-oxo]

Hi

I made a small proof of concept over the last 4 days: had to learn python

If one has a "modern" car, then it has an obd-ii connector ( http://en.wikipedia.org/wiki/On-Board_Diagnostics )

If one has a Symbian phone and a bluetooth obdii device based on an ELM device (http://www.elmelectronics.com/), it is possible to write a python script: for example to see what the warning engine red light means.

Here is my first attempt

# Bluetooth ELM
# first attempt
# by Owen Brotherwood, DK

import appuifw
import socket
import e32
import time

initELM = [  "atz\r", "ate0\r", "atl0\r", "ats0\r" ]
cmds = [ "atrv\r", "0100\r", "0101\r", "03\r" ]

def bt_connect():
    sock=socket.socket(socket.AF_BT,socket.SOCK_STREAM)
    target=''
    if not target:
        address,services=socket.bt_discover()
        print "Discovered: %s, %s"%(address,services)
        if len(services)>1:
            choices=services.keys()
            choices.sort()
            choice=appuifw.popup_menu([unicode(services[x])+": "+x
                                        for x in choices],u'Choose port:')
            target=(address,services[choices[choice]])
        else:
            target=(address,services.values()[0])
    print "Connecting to "+str(target)
    sock.connect(target)
    return sock
      
def readbt(prompt = ">" , time = 5):
    global sock, data, running, timer
    line = d = ""
    timer.after(time, subtout)
    while running == 1:
        d = sock.recv(1)
        if timeout != 1:
            timer.cancel()
        else:
            return ""
        if d == 0:
            continue
        if d == "?":
            return ""
        if d == prompt:
            return line
        else:
            line += d
    
def subtout():
    global sock, timeout, timer, running
    timer.cancel()
    timeout = 1
    if running == 1:
        sock.send("atz\r")
  
def start():
    global timer, sock, timeout
    
    for init in initELM:
      sock.send( init )
      line = readbt()  # and throw away ...
      
    for cmd in cmds:
        if running == 1:
            sock.send( cmd )
        else: 
            return
        line = ""
        line = readbt()
        if timeout == 0:  
            print line,  # or put in a dictionary ...
        else:
            print "T-T-TIMEOUT"
            timeout = 0
            start()
            
def quit():
    global sock, running, script_lock
    running = 0
    script_lock.signal()
    #appuifw.app.set_exit()

# Symbian setup
script_lock = e32.Ao_lock()    
timer = e32.Ao_timer()
appuifw.app.exit_key_handler = quit
appuifw.app.title = u"BT ELM DTC Reader"

# some globals 
running = 1
timeout = sock = 0

sock = bt_connect()

if sock != 0:
    start()
    sock.close()

script_lock.wait()
#==========================================

This basically throws up the error's found in the engine.

I doubt the app will ever be really graphical with graphs etc.: just data to aid if one is driving on holiday and the light goes on.
Another branch would be that the app can send an sms when the wife is driving the car: then I can say "stop" if it is a bad error ...

If you "need this" and can python and want to help: post.

I'll probably make a sourceforge project if there is anybody intrested.


Referance to elm : http://www.elmelectronics.com/DSheets/ELM327DS.pdf

[owen-oxo]

https://sourceforge.net/projects/symbtelm/

[owen-oxo]

http://www.cs.unm.edu/~donour/cars/pyobd/ contains some nice work in python that only needs a small change from serial I/O to Bluetooth I/0

However ... my 4 days py60 experience is not enough in finding out how to use a module/file.

I copied some files over into the python script dir on my phone: obd_io.py wants to import obd_sensors but I get an error.
I think I need some library/module path but don't know how ...
I don't want to make one big script file: but if there is no other way ...

Any help would be aprieciated

import obd_sensors
from powertrain_codes import pcodes
from network_codes    import ucodes

Edit: reading http://docs.python.org/tutorial/modu...tandardmodules

Edit: solved @ http://www.johnny-lin.com/cdat_tips/...lang/path.html
import sys
sys.path.append("e:\python")

Edit:
pys60 doesn't seem to cwd to the dir of the script
- it is e:\private\<something>
=> sucks

http://www.webdotdev.com/nvd/article...n-867-204.html

[owen-oxo]

https://apps.sourceforge.net/mediawiki/symbtelm