摘要
可编程电阻网络具有数字化、可编程、电阻可任意组合等特点,是程控电阻的一种实用方案,广泛应用于汽车仪表的检验过程.可编程标准电阻发生器电路是针对产生一个可编程标准电阻而设计的。系统硬件电路主要采用单片机控制,电阻值按照8421编码方式输出,通过矩阵式键盘键入设定值,LCD显示电路显示设定值的大小.详细介绍了该系统的电路组成、工作原理和软件编程思想.
The programmable resistance network is digitiz be combined discretionarily. It is a kind of practical sch used to test automobile instruments. The signed to generate a programmable standa single-chip microcomputer, the output of by matrix keyboard, and the magnitude o circuit components, the operating principl ed and programmable, eme for programmable and the resistances can resistance being widely circuit of programmable standard resistance generator is derd resistance. The hardware circuit of the system mainly uses the resistance takes 8421 coding mode, the settings are keyed f the settings is displayed by LCD. The paper elaborates the e and the software programming of the system.
关键词
汽车仪表
可编程电阻
单片机
automobile instrument
programmable resistance
single-chip microcomputer
