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.

基于C51单片机的波形发生器设计波形发生器，该波形发生器能产生正弦波、方波、三角波，锯齿波，梯形波,频率范围一定，有完整的proteus文件和程序。 -Based on C51 microcontroller waveform generator design waveform generator, the waveform generator can produce sine wave, Fang Bo, triangle wave, saw tooth wave, trapezoidal

基于stc单片机的频率计设计程序，大家可以试试看看(Based on the MCU frequency chip design program, we can try to see)