The system is divided into three separate sections, as shown in Figure3.1viz Black Box, IoT Device, and AWS Environment. A black box will always be present in the car. It is implemented using a CAN shield (PiCAN2) and a Raspberry pi 3b+. Raspberry pi does not have a CAN interface. So, a CAN shield is used as a gateway module to interface CAN protocol from OBD-ii port and the SPI protocol of the Raspberry pi 3b+. This is discussed in Subsection3.1.3. The Raspberry pi 3b+ is programmed to fetch the speed, timestamp, and accelerator pedal position data from OBD-ii port and store it in a log file. IoT devices can request this data from a black-box whenever necessary. A black box will read the data only when the car is in motion. The vehicle data is sampled at one sample per second. A black box will share only the latest 1200 samples of vehicle data with the IoT device i.e., past 20 minutes before the vehicle came to a standstill.
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Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!