Lesson 47--Microduino Audio Spectrum & Video Output
This course will show you how to use Microduino to get sound signal and display audio spectrum via FFT(Fast Fourier Transform) on your TV.
First, we need an electric microphone to build a device that can receive sound signal, as follows:
Connect the output terminal to Microduino's A0 port, you can use A0 output value to judge the circuit buildup.
Make RCA line, connect it to Microduino. For details, please refer to Microduino video output tutorial:
Here is the well-built circuit:
Step 3: Download the code and run. Program functions in:
1. Read data off A0 port.
2. Cut data for some time and process it with FFT.
3. Display the well-processed data in the way of scetches and lines.
4. That cycle repeats
It is displayed as follows:
You’ll see audio spectrum on displayer.