The paper presents a study of a device for measuring physiological human parameters by photometry. The purpose of this paper is to design a portable software and hardware complex for monitoring the human physiological condition based on the integrated heart rate sensor and microcontroller.
 In a process of the mathematical modeling of pulse signals, spectral analysis and filtering of the photoplethysmogram signal model with an additional pulse wave signal have been performed, which made it possible to determine both the range of values of pulse signal parameters and peak pulse signal detector parameters, that, in turn, provides avoiding calculation errors. Based on the obtained results of mathematical modeling, the computational algorithms of the physiological monitoring system have been optimized that have been implemented on the basis of a modern energy efficient and inexpensive microcontroller STM32F103C8.
 The development of a prototype system for the study of physiological parameters has been performed using a bread-board that allows fast testing and provides the ability to quickly replace/add the necessary components of the system. The implemented monitoring system has an additional function of connection to a PC on which it is possible to display data from the pulse oximeter in terminal mode, as well as further process them in the MATLAB environment for a detailed study of the human physiological condition.
 Thus, the need to create a portable software and hardware complex for monitoring the human condition, based on an integrated heart rate sensor and microcontroller, is relevant, and the designed system can be used in everyday conditions to monitor human physiological parameters such as heart rate, oxygen saturation and temperature.