Hydrophonitor

A software package to record audio and related metadata from a configuration of hydrophones.

Overview

Module	Description
audio-logger	Receive an audio signal from the DAC and write it on disk in .wav format.
gps-logger	Record position and time of the device in .csv format.
depth-logger	Record depth of the device and save it in .csv format.
*lcd-display	Provide information on the device's LCD screen
*device-controls	Provide device control using physical buttons.

Data Formats

Type | Output file format | Output file name | Output structure | Content ------------|--------------------|--------------------------------------|------------------| Audio Data | .wav | _audio.wav | Each recorded chunk will be written to its own file in audio folder | Wav audio data, configuration defined in XXX GPS Data | .csv | _gps.wav | All data written to a single file | Csv data with following fields: GPS time UTC, latitude, longitude, speed, satellites in view Depth data | .csv | _depth.wav | All data written to a single file | Csv data with following fields: date and time, voltage of depth sensor (V), depth (m) Log data | .txt | _log.txt | All data written to a single file | Text file where each entry contains the following: date and time, process that writes the entry, logged information

Output Locations

The base location/path for the output directories is defined by a configurable value BASE_DIR_PATH. If directories along this path do not exist, they will be created. If an error occurs or the location is not writable, output will be written to the default location () instead.

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A recording session starts when the Raspberry Pi is turned on or booted, and ends on shutdown. Each session will have its output written in its own directory that will be named _recordings.