手持示波器实现正弦波、方波、三角波的频率、脉宽、电压幅值的测量，通过蓝牙模块实现Android手机远程测量和数据存储。该部分为Android源码(The hand-held oscilloscope is used to measure the frequency, pulse width and voltage amplitude of the sine wave, square wave and triangle wave, and realize the remote measuremen