波形种类：三角波、正弦波、方波、锯齿波 具有频率、波形种类显示和设置功能，即能通过按键设置指定频率，指定种类的波形输出，并在数码管上显示频率值及波形种类。输出电压：0V~+5V 通过单片机的程序控制输出的波形。在数码管显示出频率的大小。通过三个按键来控制波形的转换和频率的增减。从单片机出来之后经过D/A转换。将数字信号转换成模拟信号，结果在示波器上面观察。-Waveform types: triangular wave, sine wave, square wave, sawtooth wave has a frequency, waveform display and set the type of function, that is, through the button settings specified frequency, the specified types of waveform output, and digital tube display frequency value and the waveform type. Output voltage: 0V ~+ 5V MCU controlled through the output waveform. Shown in the digital frequency control size. Through three buttons to control the waveform and frequency increase or decrease in the conversion. After came out from the single-chip D/A conversion. Digital signals into analog signals, resulting in the above observation of oscilloscope.