Design Of A Fully Automated Enzyme-free Analyzer Control System Based On STM32

With the continuous improvement of living standards,people pay more and more attention to health.,the attention of the disease has also been raised from the treatment to the prevention.In disease prevention,biochemical test has become an important mean and objective basis to detect and prevent the human diseases.Automatic ELISA processor is a kind of high efficient and convenient testing equipment which based on ELISA analysis system.And it is a necessary instrument for clinical diagnosis in large and medium-sized medical institutions.By testing the related substances content of patient's body fluids such as blood or urine,we can provide corresponding pathological indicators for the doctor quickly and accurately.And with this to prevent the diseases such as hepatitis,HIV,tumor,parasitic diseases,diabetes,and myocardial infarction.Through research on the current development of this kind of device,I have learned that the domestic ELISA analyzer development level is inferior to international level,which also leads to the foreign products in the market share is much higher than that of domestic products.But even foreign products few able to finish the whole experiment of ELISA.In this paper,through the investigation and research of various kinds of products in the market,we developed a new kind of automatic ELISA analysis system,and it has a set of real fully automated technical routes.According to the design requirements of the ELISA analyzer,select STM32 microprocessor as the control chip of the whole system.Around the STM32 microprocessor to select components and complete the corresponding control circuit design of the motor drive module,temperature control module,communication module,power module.In this system,I use the CAN bus and the serial port to realize the communication between the control board and the data transmission between the host computer and the control board.In order to improve the control precision and speed of system,I have demonstrated and optimized the control algorithm of actuator,and take the S curve after optimization control algorithm to control the rotation of stepper motor,based on this algorithm to complete the motion control of the entire system.Finally,for detect the control precision of system,the suction and discharge experiments were carried out on the sample feeding system which is the core module of the ELISA analyzer.Through the analysis of the experimental data and error,we can get the system error compensation curve and correction method.In order to improve the robustness of the system and reduce the system error,we better the control system with the way of error compensation and experiment results show that the accuracy of the improved system is improved.Using STM32 microprocessor to complete the control system,not only reduces the production cost but also shorten the development cycle.The ELISA analyzer designed in this paper can satisfy a wider range of demand,and it has guiding significance for the development of the follow-up medical devices.