数字式电阻测试仪 摘要： 本系统根据要求设计了一可以数字显示的电阻测量仪，电阻值由四位段七位数码管显示，要求设计量程为100Ω~100KΩ，红绿灯显示单位。 -Digital Resistance Tester Abstract: In accordance with the requirements of the system can be designed a digital display meter resistance, resistance paragraph 7 b

红绿灯复杂的程序控制的编写及对照，方便大家日后练习-Traffic lights to control the preparation of complex procedures and controls to facilitate future exercises

十字路口红绿灯的转换，并且控制时间的长短。-Realize the intersection traffic lights