一、　　实验目的

1、进一步了解DAC0832的性能及编程方法。

2、了解直流电机控制的基本方法。



二、　　实验内容

1、按图55线路接线。DAC0832的CS接290H～297H，Ub接DJ插孔。8255 CS接288H～28FH。

３、　　编程利用DAC0832输出一串脉冲，经放大后驱动小直流电机，利用开关K0～K5控制改变输出脉冲的电平及持续时间，达到使电机加速，减速之目的。

三、　　实验原理简述

小直流电机的转速是由Ub输出脉冲的占空比来决定的，正向占空比越大转速越快，反之越慢。见下面图例：

在本实验中，模拟量输出Ub为双极性，当输入数字量小于80H时输出为负，输入等于80H时为0V，输入大于80H时输出为正。因而本实验中，DAC0832输入数字量只有2个（80H和FFH），通过不同的延迟时间达到改变小电机转速的目的-A,Test a purpose

1, the function and plait distance method of further understanding DAC0832.

2, understand the basic method of direct current electrical engineering control.



Two,Test a contents

1, press the figure 55 circuits to connect line.The CS of DAC0832 connects a 290 Hs~297 Hs, the Ub connects a DJ socket.8255The CS connects a 288 Hs~28 FHs.

3,Weave a distance to make use of DAC0832 to output a string of pulse, after enlarging, drive small direct current electrical engineering, make use of 0~ K5s of switch Ks control change output pulse of the electricity is even and keep on time, attain to make the electrical engineering accelerated, decelerate of purpose.

Three,Test principle Jian Shu

Small direct current electrical engineering s turning soon to output sharing of pulse from the Ub is empty ratio to decide, just to share empty compare more and greatly become soon more quick, whereas more slow.See the underneath diagram example:

In this experiment, imitate quantity exp