Design of air pressure detection system based on sectionalized linear fitting

摘要

An improved air pressure detection system is proposed to solve th e problem in balancing linearity and operational speed of a regular air pressure detection system . O ur system utilizes an A tm egal6 m icrocontroller as th e controller, and a high-precision pressure sensor 10N1600A-T and 24-bit，AD chip HX711 to d etect the air pressure, to perform analog digital conversion and to process th e d a ta using an improved sectionalized linear fitting m ethod. D etection results can be displayed through the LED nixietube, and can be o u tp u t as a 0 to 5 V analog signal, an RS485 rem ote m ode, or a relay switch signal to m eet different control needs. O ur testin g proves th a t the system can accurately d etect th e pressure variation of 0 to 1600 k P a and the sectionalized term inal-based linear fitting m ethod can improve the system linearity and ensure the operational speed, so th a t th e subsequent control system can quickly and accurately respond to the pressure variation.