db_panel

This repository contains the source code for the db_pannel project. The goal is to display multiple noise level indications.

It uses CircuitPython on a Adafruit Matrix-portal M4 board, with a 32 x 32 square RGB LED matrix panel.

Panel assembly

Installation

• Follow the steps from https://learn.adafruit.com/adafruit-matrixportal-m4
• Copy the lib, bmp and code.py files on the CIRCUITPY drive.

Repository layout

• The code.py contains the application code for the project.
• bmp folder contains the Emoji image used by the main application to indicate the average noise level.
• circuitpython folder contains the CircuitPython installation binary for the Adafruit Matrix-portal M4
• lib folder contains the python libraries used by code.py.

User Manual

The db_pannel comes with 4 modes:

• Current noise level mode: Indicate the current noise level with a 2 digits number.
  
• Noise level histogram mode: Display the noise level in a histogram with the last 32 measurements.

- `Noise spectrogram` mode: Display a live spectrum graph, computed with a Fast Fourier Transform operation. This graph is difficult to interpret by itself, and it’s more here for educational purposes.

- `Noise level selection` menu: Display the current limit *Level* of noise before the graph and numbers turn red in the previous modes. Value range is from 1 to 32.

- `Emoji selection` menu: Select if an green, orange, red Emoji is displayed every 30 secs, based on the previous measurements. Possible range is `True` (enable) or `False` (disable).

The DOWN button is used to switch between modes. The UP button is used to interact with the current mode: Increase the Noise level in every mode, except on the Emoji selection menu where it is used to enable/disable the Emoji.