Arduino Live DFT is a real-time web application that connects directly to your Arduino with an ultrasonic sensor (HC-SR04) via Web Serial API. It streams live distance measurements, performs instant Discrete Fourier Transform (DFT) analysis, and visualizes both time-domain and frequency-domain data—all in your browser with zero installation.
How It's Useful to Users:
For Students & Educators
Learn DSP visually: See how physical motion (approaching/receding objects) translates to frequency components in real-time
Understand DFT/IDFT: Bridge the gap between textbook formulas and real sensor data
Interactive experiments: Test different motion patterns and immediately see their frequency spectra
For Makers & Hobbyists
Debug ultrasonic projects: Identify noise sources, vibrations, or irregular motion patterns
Optimize sensor placement: Analyze signal quality before finalizing designs
Build smarter robots: Detect not just distance but how objects are moving (vibrating, oscillating, etc.)
For Engineers & Researchers
Prototype signal processing algorithms: Test filtering concepts before hardware implementation
Data logging: Export CSV files for further analysis in MATLAB/Python
Non-contact vibration analysis: Detect machinery vibrations from a safe distance
Practical Applications
Vibration monitoring: Detect motor imbalances or loose components
Gesture recognition: Identify hand waves, pushes, or pulls
People counting: Analyze walking patterns through doorways
Liquid level monitoring: Detect surface wave frequencies in tanks
Security systems: Differentiate between animals, humans, and vehicles
Key Benefits
✅ Zero setup: No software installation, runs in Chrome/Edge
✅ Real-time feedback: See data as it happens
✅ Educational: Built-in Arduino code and explanations
✅ Exportable: Save data for further analysis
✅ Free & open: Complete learning tool for everyone
Bottom line: It transforms a $5 ultrasonic sensor into a powerful signal processing laboratory that fits in your pocket!