"AT89C51单片机低频信号发生器设计与实现"

The digital signal generator based on the AT89C51 microcontroller is designed to generate various low-frequency signals such as square, triangle, and sine waves. The system consists of a DAC0832 digital-to-analog converter, LM324 operational amplifier, buttons, and an 8-digit nixie tube display. Users can control the waveform generation and frequency through the buttons, with the corresponding frequency displayed on the nixie tube. The system is simple in design, high in performance, and practical for various applications requiring low-frequency signals. Signal generation is crucial in the field of communication, with sine, triangle, and square waves being common signals used in experiments and research. To facilitate experimentation and research, a flexible, fully functional, and easy-to-use signal source is necessary. This system, utilizing the AT89C51 microcontroller and DAC0832, allows for the generation of different low-frequency signals with controllable amplitude and frequency. The principles and usage of the DAC0832 and AT89C51 microcontroller are briefly explained in the document, along with details on related components in the circuit. The hardware circuit and software programming for controlling the D/A converter to generate the desired signals are elaborated upon. The system allows for adjustable signal frequency and amplitude as needed. The design scheme for the low-frequency signal source not only meets the requirements in theory and practice but also demonstrates feasibility. Key features of the signal source include its compact size, low cost, stable performance, easy implementation, and comprehensive functionality. Keywords: AT89C51, DAC0832, LM324, 8-digit nixie tube display