The system is mainly controlled by the microcontroller AT89S52, the periphery is consist of the circuit of clock and calendar, the circuit of measure height and weight,the circuit of display, all of these comprise the circuit board of the intelligent apparatus of height and weight. It can achieve all function of the apparatus. To sensor thepressure signal sensitively and conveniently, a ZCL-2 strain sensor is used, which has such characteristics as high sensitivity, dynamic fast response, high accuracy, stability, wide temperature range, small and micro-easy, easy and convenient to use mass production. ADC0809 chip is used for A/D convert, and LCD 1602 for the Real-time display of pressure signal. As to the software design, the popular modular programming method is applied, and all programs have been designed with C language. Some of the main programs include: interrupt proceedings, A / D sampling subprogram, data processing subprogram, delay procedures, and LCD display subprogram.
