![]() A battery management system is controlling them and will store the data. So get the hardware and prepare the RPi for the CAN utils and start sniffing.īut for what are we looking? The high voltage battery of the Smart ED consist of 93 lithium ion cells. ![]() Also take a look at the site of Chad Gibbons. You will find a very useful tutorial about everything you need to know about CAN bus on a RPi from the CowFish team here. This is a socket CAN driver and utility package. Get a CAN bus shield like the PICAN and install the free CAN utils software. Most cars use a 500kbit/s data rate (or above) and with a bus load of 40% you will have to save about 1500 messages per second.įor this purpose a Raspberry Pi is a very capable platform. An Arduino based logger, saving the sniffed data to a SD-card, is often not fast enough for capturing the whole traffic. When sniffing and logging the complete CAN bus traffic, you need a fast processor. ![]() Beside the diagnostic information there is a lot of useful data about the status of the car. I wanted to know what information was gathered and began to analyze the CAN bus traffic of the car.ĭigging into the CAN bus protocol I managed to reverse engineer queries for the cell voltages and the cell capacities. The GSM modem in my smart electric drive EV was in this mode for a certain time. In connected cars manufacturers gather diagnostic data and transmit them for field studies or planed maintenance. ![]()
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