Abstract:The design is based on the microcontroller AT89S52 system, has reliably actualized the meterage of weigh from 10g to 10Kg , and has the part of sampling circuit composed of ICL7135 、 a differential measuring amplifier .Our system can accurately measure weigh, and calculate the price .The data collected are processed by the microcontroller and then displayed in the LCD. In addition, to make the display more visual and convenient, our system can easily display the bill of every buyers.
Key word: microcontroller, meterage, sampling circuit, differential measuring amplifier LCD, weight , bill