Research And Design Of Precise Pressure Control System Based On STM32 Microcontroller

With the rapid growth of electronic industry,mouse,keypad and touch pad are widely produced and used in electronic devices.In the process of these electronic devices using,they must be pressed by random or continuous pressure.In order to guarantee product quality,simulating different pressure in such user case is essential,so a precise and adjustable precise pressure control system is needed.This paper is to discuss the research and design of this kind of system.The precise pressure control system includes Windows software,PCBA,MCU firmware,pressure sensor,precise linear motor and motor driver,etc.The main goal of this project was to output a precise pressure within stipulated time which was set through Windows software and accomplished by adjusting motor parameters.Specific design content includes design of Windows software,design of electronic schematics,PCB layout,and design of MCU firmware,system fabrication,debugging and testing.Software was designed under Windows Visual Studio circumstance,using C# language;hardware was based on STM32F103 microcontroller and a 24-bit precise analog to digital converter;pressure sensor was using LSB200 from FUTEK company,its pressure accuracy is less than ±1g;Oriental motor's pulse sequence input type linear actuator DRL20 G and corresponding motor driver LRD503-K were used as execution unit,the stepping precision was up to 8nm.The parameters of the system like test pressure can be set through Windows software.The output pressure was implemented by the firmware using industrial positional PID close-loop algorithm.At last,the system was final tested.The test results showed that the system's pressure output curve comply with design requirements,with rising edge less than 150 ms,pressure accuracy and stability less than 2g and falling edge less than 80 ms.The system was certified to be stable,reliable,easy to use and suitable for industrial application.