关键词: 水位控制, AT89S52, ADHX711, 微弱信号

Abstract:

In order to realize accurate control of the water level in the container,we propose a system using AT89S52 as the main control chip and with the 24 high precision A/D conversion chip HX711 to process weak voltage signal variation of the weighing sensor output.The signal variations are converted into digital signal and then the corresponding water level value are displayed on the LCD screen 12864 using software.The test results show that the error value between the displayed water level and actual value is less than or equal to 0.2 mm,while the error value between setting value of water level and actual value is less than or equal to 0.4 mm.Results demonstrate that this system has good stability,high accuracy and certain application value within the scope of automatic water level control.

Key words: level control system;AT89S52;ADHX711;faint signal