I have recently been working on writing software for some very small tracking devices. I decided to take on an electronics engineer and start building some boards myself using a GPS/GPRS module. I ended up making a USB tracking device that streams the users' location back to our servers.
I now want to take this a step further and look at interfacing my electronics project with the car so that I can obtain more information, such as speed, RPM, throttle position etc. I'm currently conducting some basic research and am reading a lot about interfacing with the vehicle's OBD. This seems sensible as there is a lot of data available here and would allow for a simple quick installation.
I used to drive a Peugeot 206 which had an insurance telematics unit to reduce the monthly payments. Fortunately I still have the car and just nipped out to see if this is where the installed unit was taking information from. Initially, to my surprise, I couldn't see anything plugged into the OBD.
I am trying to understand why the telematics box my insurance company installed did not use the OBD. Is it because the OBD is too easy to access and can be tampered with? Or more importantly, is there a better interface within the car dashboard that I could use with my electronics project? I'm asking this question from a commercial perspective so I can understand the best option for building a telematics device and then selling it.
Just to make it clear, I have no interest in touching or tampering with the insurance telematics unit, I would just like to know for the sake of my electronics project the best place in the car to interface with in order for my device to read more data about the car.