zigbee精简协议栈代码，包括各层的源代码，并富有CC2420的节点原理图,simple the zigbee protocol stack code, including all levels of the source code, and the rich nodes CC2420 Schematic

一款3G手机电路图, 3G手机电路图-Schematic of A 3G mobile phone

3G智能电表，包含C++程序和原理图、PCB图，三相智能电表设计-3G smart meters, including C++ and schematic, PCB diagram, three-phase smart meter design