用单片机设计频率计，用诺基亚手机3310屏幕做显示部分，原理图、程序、实物图片。-Single-chip design using frequency meter, using the Nokia 3310 mobile phone display screen to do part of schematics, procedures, physical picture.

WIFI 无线 智能插座，手机APP控制与定时（原理图、PCB、APP及程序源码）(WIFI wireless smart socket, mobile APP control and timing (schematics, PCB, APP and program source code))