Abstract
Objective With the extensive application of vacuum sealing drainage (VSD),vacuum control mode needs to be developed and improved.The aim of this study was to develop ARM-based VSD system.Methods The system was composed of central processing unit,pressure sensing unit and pressure control units.32-bit LJD-e Win7000 was used as central processing unit.X-type silicon pressure sensor was used to sense the pressure.Real time feedback technology was applied to control the solenoid opening and closing in order to accurately control the negative pressure.Results VSD pressure control system was completed.Compared with the measured value,the system had relatively large error in low pressure.With the increase of pressure,the error decreased.Conclusion Through linear correction algorithm,the pressure control system can meet the requirements of VSD machine. Key words: Vacuum sealing drainage; ARM system; Pressure control
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