four LED是什么意思

The SN74HC239 decoder was adopted in the surface rough-meter based on fiber sensor, and the roughness value was displayed by four-LED.

基于光纤传感器的表面粗糙度测试仪，采用SN74HC239译码器，粗糙度值以四位LED数码管显示。

Demonstrates the real - time clock monolithic integrated circuit source program with four LED numerical code display tube , Asm.

用四位LED数码显示管显示实时时钟单片机源程序。

设计一个程序，输入四个一位十进制数，用4个LED显示出来。

四位LED数码显示驱动管动态扫描驱动单片机源程序，

four LED