基于单片机控制的电子秤，（包括12864液晶屏的显示，模数转换程序ad7705，SPI协议，i2c协议，外存储空间的扩展等）-Microcomputer-controlled electronic scales, (including 12 864 LCD display, analog-digital conversion process ad7705, SPI protocol, i2c protocol, external memory expansion, etc.)