This is an audio spectrum VU meter using the LoL Shield
The LoL Shield is a 14 x 9 LED matrix which fits onto the Arduino as a shield and is controlled through an efficient method known as Charlieplexing
. It was designed by Jimmie P. Rodgers
This project uses a Fast Fourier Transform library for Arduino
to analyze an audio signal, break it up into frequency bands, and display that information on the LoL Shield.
The Arduino microcontroller is fast enough to calculate a fast Fourier transformation. It lives up to its name and is surprisingly fast and accurate.
Since all the work is done by the microcontroller, this project is completely portable if you use batteries.
The webpage for this project is located at http://andydoro.com/vulol/Parts required:
- LoL Shield
- Arduino (Diavolino recommended)
- audio jack (I used a male mono 1/8" phone plug)
- Arduino code
- power supply (DC power supply, USB cable, 9V battery, etc.)