Vestnik of Samara State Technical University. Technical Sciences SeriesVestnik of Samara State Technical University. Technical Sciences Series1991-85422712-8938Samara State Technical University2134410.14498/tech.2019.2.%uResearch ArticleAutomatic determination of viscosity by rotary viscosimeter vrtsKorganovaO. G.Info@eco-vector.comKuznetsovV. A.Info@eco-vector.comSamara State Technical University1506201927288980603202006032020Copyright © 2020, Samara State Technical University2020<p>If it is necessary to determine the viscosity at a given temperature, various viscometers of various types, mostly rotational ones can be used. These viscometers need to stabilize the frequency of rotation of the measuring rotor and the use of thermostats, since the viscosity is strongly dependent on temperature. A method for measuring viscosity without these disadvantages is proposed. A viscometer contains two channels: a viscosity measuring channel and a temperature measuring channel. Rotation of the measuring rotor is carried out by a drive through a calibrated spring, the angle of its twisting is proportional to the torque, which is converted into a pulse-width signal. The microcontroller measures and analyzes PWM signal and a stress proportional to temperature, converts them into a digital code and outputs the information on viscosity and temperature through the output port in a digital form. The algorithm proposed for processing measurement information eliminates the need to stabilize the frequency of rotation of the measuring rotor.</p>viscosityrotary method of measurementmicrocontrollerincrease in accuracy of measurementвязкостьротационный метод измерениямикроконтроллерповышение точности измерения