基于51单片机电子秤的设计，步骤详细制作明了，可很好的参照-51 MCU-based design of electronic scales, steps detail constructive and clear, can be a good reference

基于51单片机的十字路口交通灯设计，有keil工程文件，proteus仿真，c语言程序，原理图及pcb图纸。-Based on 51 single-chip crossroads traffic lights design, keil project files, proteus simulation, c language program, schematics and pcb drawings.