ABSTRACT Educators face significant challenges in delivering comprehensive instruction on Fast Fourier Transform (FFT) due to the scarcity of affordable, hands‐on learning materials that simultaneously integrate hardware components and software applications. This paper presents an inexpensive Arduino‐based real‐time audio spectrum analyzer that serves as an effective educational platform for teaching data acquisition, FFT analysis, and graphical display techniques. Our implementation employs minimal components: an Arduino Nano microcontroller, an OLED 128 × 64 (I 2 C) display, and a microphone input, creating an accessible standalone system for remote learning environments. Critically, we address the often‐overlooked issue of software version discrepancies in open‐source libraries, demonstrating how these inconsistencies quantifiably impact system functionality and real‐time performance. Our benchmarking reveals that using incompatible library versions resulted in a 50% reduction in processing speed (from 12 fps to 6 fps), introduced a lag of more than 100 ms, and produced significant display artifacts that affected measurement accuracy. These performance differences directly impact the educational utility of the system, particularly when teaching time‐critical applications. The paper provides practical guidance on calibration techniques for accurate measurement and strategies for navigating software compatibility challenges. This approach enables students and novice engineers to construct and experiment with functional spectrum analyzers outside traditional laboratory settings, while simultaneously developing crucial skills in troubleshooting the software version discrepancies that commonly affect real‐world engineering projects.
Yoshiyasu Takefuji (Sun,) studied this question.