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The purpose of this study is to design and make a prototype of a motorized vehicle speed data recorder by utilizing MMC (Multi Media Card) as a data recording media so that there will be factual evidence in the form of a motor vehicle track record as long as the vehicle is running. The research method uses the Research and Development (R &amp; D) approach, with stages: hardware design and firmware creation, hardware testing, GUI application creation, GUI application testing, data retrieval testing, and data analysis. The entire system of this tool is controlled by the ATmega328 microcontroller, the RTC module is used to generate timer signals in real time and Infrared Sensors (IR Sensors) as wheel rotation detectors that are used as car speed sensors when driving. Data is recorded in the form of real time speed, accelerator (acceleration) and the distance stored in a Secure Digital Card (SD Card) or MMC (multimedia card) within the specified time interval. The results of hardware testing show that the design works through all the test scenarios performed. GUI applications and firmware are tested by blackbox testing, and show that the system is running smoothly. In addition, testing is also focused on speed data recording segmentation algorithms, with the result that the algorithm can mark the phase of each speed change with 100% accuracy. Product testing with data retrieval is done in 10 (ten) data by comparing the actual distance indicated by the speedometer with the system measurement value. The test results show that the system can accurately estimate activity parameters for each change in speed, with an accuracy rate of 98.91%. In addition, the standard deviation value of 0.02625 km / h indicates that this system is considered consistent in measurement.

Design and development of multi media cards as a motorized vehicle speed data recorders