Today mobile applications are practically everywhere, they are used in every step and on more and more areas. But when we are talking about cars, vehicles and other machines that use combustion engine for their drive or doing work, there are not so many applications for mobile devices. The goal of this thesis was to develop an application witch by using a microphone of mobile devices will be able to calculate and determine as exact as possible number of rotations of engine per minute. In this document, we present technologies, devices, and tools which were used in our thesis, we also present different tools and devices which were used or are still used for determining engine rotations per minute. We also show different methods of frequency analysis. And in the end, we show how tested our application in real life situation compare with professional equipment.
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