Abstract
This design uses AT89S52 microcontroller, strain gauge sensor for data acquisition so that intelligent human health electronic scale is designed.The design uses a LCD display for showing weight in digital form, and enter the height information through the keyboard, combines height with weight information to calculate the health index, to determine the degree of obesity.System also designed a main power controlled by the MCU control power, the main power is for the microcontroller and the display and keyboard module power,while the controlled power supply sensors, data amplification and conversion module. By setting a timer, the MCU is sleepingzero time to time to read and update, and by judging whether the people is in weighing to decide whether the controlled power to work in order to achieve battery saving and automatic balance features. Meanwhile, the electronic scale weighing range of 0～150KG, to make the system more comprehensive, also overload alarm function is added. This paper gives the hardware circuit diagram, flow chart of main program and some subroutines so that the design concept is clear, through hardware and software designing, human health scale has some intelligent features,be easy to use and affordable which has a definite use propects.
Key words: SCM sensor LCD
