As part of the final work, it is necessary to create a cheap and efficient circuit for measuring the frequency of the power system using the Raspberry PI platform. The corresponding program should convert the measured values from the sensor into corresponding physical values with eventual calibration. Computer support should enable the choice of different averaging intervals of the measured quantity. In addition, the developed solution should ensure periodic reading of the frequency along with the time stamp of the reading with the possibility of sending data to a "cloud" service that enables free storage and downloading of chronological measurement data. To examine the precision of various designs of circuits and algorithms for frequency measurement in relation to the available reference measurements.