There is OBD-II device like this device provider does not have its web page or documentation source. We have short 'quick start' in box and assurance that it support OBD-II PIDs. Recently I used to follow The question is, if there are any general pattern how to communicate with this icar device. Before I've used to connect with (freematics)dongle that has send the stream of data which I've parsed on fly. Current one send only one value after one request we send to it (it is synchronous and can't handle more than one request per time). I would like to get up-to-date OBD-II params to display them(frequently). If your device is compatible with the ELM327 you can use multiple PID requests but only if adapter is connected to the vehicle with CAN protocol.

So it would work only with a subset of vehicles because not all vehicles support CAN. Popular scan tools simply sends sequential requests. Maximum throughput you can gain with this approach is about 30-40 rps. I don't know how freematics dongle works but I can see it has some SD card mounted - maybe it gives only emulation of parallelism and internally every request is sent sequentially? If you are searching for reliable Java library for connecting to OBD II device I would recommend you. You can also take a look at my library.

Since the mid '90, virtually all manufacturers conform to the On-Board Diagnostic (OBD) regulations enforced by the U.S. Government and thus make it easier for. That take care of communication and message management are implemented as well as the basic user interface (close to 3000 lines of Java code so far).

I have always loved to 'tinker' with things. Once I got my first car, I was no longer bored in my free time. When I stumbled across this project, I knew I had to do it.

I was well aware that once finished with this project, my future was destined to be one without a social life. But that doesn't matter, because now I'm able to monitor every little thing that goes on in my car! The scripts used for this project were derived from a project called pyobd from a genius named Peter Harris. His original code can be found from. A lot of variables had to be modified in the original code to better fit my application. Was very helpful when it came to finding conversions and units for the bytes coming through the OBD-II port.

In the 'Sort sensor data' script, I also wanted to convert the PID data from the OBD-II port to imperial units, because America. In order to be able to access the terminal in the Raspberry Pi (Raspbian OS), I decided to use SSH to it with my spare laptop running a Debian Linux distro. I used my cell phone as a wifi tether to connect my laptop and the Raspberry Pi.

Getting live OBD-II data on a regular drive Recording Data to a.log File Another script took all the sensor data and logged the data that I felt was important. The logging function in the 'Record data' script saves the sensor outputs that you predefine in the script as a.log file. This can be called in the terminal by typing: >>cd pyobd >>python obd_recorder I updated many of the calculations in this script to accurately print the gear ratio information in the terminal. Cm23e Usb Receiver Driver Download on this page.

I decided to log the time, engine rpm, speed (in MPH), and the fuel trim information. If you want to modify any of the logged parameters, you could do so in the 'Record data' script. Log data was taken in 'Mexico', of course I only logged the first four gears because speeding is dangerous. F1 Challenge 99 02 Setups Gaming.

The plot that came out of the logged data looked so beautiful to me, that I posted it on Instagram. I was very surprised about how well defined and linear the slopes are for each set! While this project took a bit of time, I would absolutely recommend it to anybody that has an interest in cars. The scripts for this project were used to log and capture data, but they are also able to read malfunction codes.