Created: Sep 10, 2015
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In-vehicle cameras are one of the best ways to record vehicular accidents. It can be used as evidence of the incident that happened which offers a piece of mind to drivers. The device starts to record when it detects that the car is moving or when pressing the start button. It has a recording system that is flexible to choose between PIR activated timer, continuous and externally triggered recording modes. This device can also capture images as desired by the user.
The system supports a standard file system (FAT16 or FAT32), and image compression format (JPEG). The users can control the camera by means of an infrared remote. The camera module consists of a VGA (640x480) CMOS color sensor and a JPEG compression chip. The compression engine includes a serial interface at 3.3V levels that can be connected directly to a microcontroller’s UART. The files are directly compatible with PCs since it uses the AVR-DOS file system. It is a library for driving mass storage devices such as SD, CompactFlash and even hard disks. In addition, the PIR movement sensor can sense up to 5 meters. This device triggers a software block, which is in charge of deciding how many pictures to take according to its trigger inputs and operating mode. The recorder controls the camera driver in order to get the JPEG byte stream. The real-time clock is a hardware feature of the AVR controller, and the recorder uses it both for time-stamping the JPEG files with current date and time, and as an interval timer if time-lapse photography mode is selected. After time stamping, the recorder hands over the picture data to the file system, which stores it permanently on the SD-card.
The design has various alternative applications such as for home surveillance system, or can be an automated barrier system that is capable of registering plate numbers and drivers in a parking lot. The data recorded will serve as evidence for thefts and accidents occurred.