Simple Design Of Analogue Signals Frequency Meter

During the first decade of the twenty-first century, significant advancements were made in machine measurement engineering, design, and control. Signal processing and the study of its characteristics serve as fundamental pillars in numerous scientific disciplines, particularly in applied sciences such as engineering, science, computer science, and space science etc. Frequency is a crucial factor influencing the characteristics and shape of signals. Frequency plays a crucial role in determining the characteristics and shape of signals, making its measurement essential in numerous industrial and research contexts. This paper aims to design and simulate a frequency measurement system for analogue signals. The frequency measurement range extends from 1Hz to 65khz, with an error rate of approximately 0.1% for frequencies exceeding 60KHz Based on developed board IDE, of the PIC16F84 microcontroller, the control function and frequency calculation of the input signal are designed and implemented. The analogue signal to be measured is converted into a pulsed signal with the same frequency across two circuits, respectively. The first filter circuit isolates and removes all DC components of the signal, while the second circuit is a zero-crossing circuit (ZCD) for generating a pulsed signal with the same frequency as the original signal. The output of the second circuit serves as an input to the microcontroller. The C programming language is utilized for the development panel of the controller. Results are displayed on an LCD screen connected to the control panel, demonstrating the system's efficacy in accurately measuring frequency. The findings indicate that the proposed frequency measurement system is reliable and effective for a wide range of applications in both industrial and scientific research.