The work is aimed at solving the problem of the technological process automation in the field of obtaining oxide coatings with specified properties by the microarc oxidation method. Software has been created to control the microarc oxidation process complex, which implements the following equipment operation modes: oxidation mode; process cell impedance measurement mode. The voltage pulse sequence is formed by the unit controller. Voltage pulse and current pulse parameters are measured using a digital oscilloscope. It is proposed to use an improved five-element model of a galvanic cell in order to extract components related to the parameters of the synthesized coating from the result of measuring the impedance of a galvanic cell. The model takes into account the electrolyte resistance between the anode and the cathode, the resistance and capacitance of the double electric layer, the resistance and capacitance of the coating. The results of obtaining an oxide coating on the example of aluminum alloy grade AD31 using the developed hardware and software complex are presented.