Inspiration
Approximately 15% of adults have some form of hearing loss. While this can be genetic, it can be induced by being exposed to loud noises for prolonged periods of time, particularly high frequency noise.
What it does
This is a portable device that determines when there is too much loud sound or too much high frequency noise (via Fourier analysis) and alerts the user via LEDs. It also stores the duration of how long these events occur so it can be accessed later for reference.
How we built it
This device has simple circuitry; it involved an Adafruit microphone (5V, Ground, A0), and two LEsS (5V, Ground, LEDs). The Pro Trinket we acquired already had the battery wired correctly, so the only additions involved were wiring those additional components.
Challenges we ran into
The real complexity came from the code. We had to find a library to perform Fourier analysis efficiently without using too much processing power and then use the library for our purposes.
Accomplishments that we're proud of
Incorporating the Fast Hartley Transform library
What we learned
What's next for Audiosafe
Finding a better microphone and processor such that we can get more accurate frequency data and use more frequency bins for a more nuanced analysis
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