Audio Spectrum Analyzer (made in IoToToy)

A real-time audio spectrum analyzer built using the IoToToy visual programming app for Android.

Overview

This project visualizes audio frequencies captured from the device microphone. It processes the signal through a Hann window and a Fast Fourier Transform (FFT) to display a frequency distribution from 0 Hz to 2 kHz.

Signal Chain

The logic is defined in audio spectrum analyzer.json and follows this flow:

1. Microphone: Configured to capture mono audio at 8000 Hz.
2. Hann Window: Smooths the input signal to improve FFT accuracy.
3. Buffer: Groups data into blocks of 512 samples.
4. FFT: Converts audio from the Time Domain to the Frequency Domain.
5. Square Sum: Calculates the power / magnitude of the frequencies.
6. Array Slice: Extracts the 0 - 2000 Hz range for visualization.
7. Progress Bar: Renders the spectrum visually on the screen.

How to Use

1. Install IoToToy on your Android device.
2. Download the audio spectrum analyzer.json file from this repository.
3. Open IoToToy then FILE -> OPEN the JSON file.
4. Run the diagram to see the real-time spectrum of your environment.

Requirements

• Android device with microphone access.
• IoToToy app (v1.0.5 or newer).