温度传感器ds18b20的使用，测量实时温度，可以更好的掌握实时温度-Temperature sensor ds18b20 use, real-time temperature measurements can better grasp the real-time temperature

利用8255，8253对直流电动机的转速进行测量，并设计算法控制占空比输出，绘制实时波形-DC motor speed measurement and control, VC use 8255,8253 realize the measurement of motor speed control algorithms with and set to draw waveforms