| 2. | Chapter two addresses in details systematic design and related modules of stand - alone door - lock system . the modules include mcu , recognition module , power , lcd , guide voice , i / o decoding circuit , rtc , unlock circuit , power save and anti - interference design 第二部分着重介绍了指纹门禁单机系统的系统总体设计以及系统中涉及到的各模块的基础知识、设计思路和具体实现。 |