Research On Frozen Cell Automat Control System Based On ARM

In the last twenty years, frozen cell technology has developed into a truly viable conservation, breeding techniques in biomedicine, human’s propagation, livestock husbandry breeding, etc.But the exchange of cell medium is mostly done by manual operation before cell is frozen, it results in high cost, low efficiency and poor reliability. Therefore, according to the characteristics and needs of the exchange of cell medium before frozen cell, this paper researches and designs a motion control system of STM32-based frozen cell automat, based on analyzing the current home and abroad motion control technology.Firstly, after analyzing the advantages and disadvantages of common acceleration and deceleration algorithms of stepper motor, this article adopt the S-curve speed algorithm based on trigonometric function and functional system requirements, and then designs the hardware circuit of motion control system based on STM32, compiles application programs for the control system based on the μC/OS-II operating system, and designs monitoring interface based on LabVIEW. By controlling the multi-axis motors, the frozen cell automat achieves replacing the cell culture medium automatically. Under the premise of the X-Y worktable’s speed lower than 20mm/s, control system meets the requirement of 1mm positioning accuracy.The main work and the research results of this thesis contain the following aspects:1. Through analyzing the working principle of the frozen cell automat, system uses multiple motors to drive mechanical components moving in a predetermined manner, to achieve to replace the culture medium for cell on the microfluidic chip automatically. Based on the in-depth study of speed control algorithm for stepper motor, this paper puts forward S-curve velocity modulation algorithm based on trigonometric function.2. After analyzing the characteristics of the automatic control system, the general design scheme of the control system is given, and main control chip models, operating systems, velocity modulation algorithms are introduced and selected.3. The thesis designs the general scheme of hardware circuit for the control system, including the STM32 minimum system module, the pulse amplitude switching circuit, 28 BYJ stepper motor driving circuit, serial communication module, temperature and humidity monitoring circuit module, analyzes the function of every circuit module, and designs each circuit design in detail.4. The system puts up software platform based on μC/OS-II, carves up different modules with modularized design idea. It designs PC interface on the foundation of LabVIEW, indoor temperature and humidity information, stepper motor speed could dynamically display on the PC interface.5. After completing the design of the control system, the system is tested and analyzed according to the performance requirements of the system. Simulation results show that the S-curve velocity modulation algorithm based on trigonometric is feasible and reliable, and the test results of control system’s positioning error show that the control system meets the performance requirements of the project.