RAR

RAR stands for Remote Acoustic Recording device. This repository holds all the code necessary...

• To run the hydrophone (underwater microphone)
• Schedule recording (based on a time range using 24h time)

This repo also contains a simple battery-testing script and a script to send the pi's ip address on boot for easy ssh access.

Getting Files/Folders off of the Pi

To get files/folders off of the Pi, I recommend using sftp (more info). Briefly,

1. On your local machine, cd into your Downloads folder (or into a folder that convient for you for holding the Pi files you want to download)
2. Type this command sftp pi@<ip address of Pi> (its just like the ssh command except replace ssh with sftp)
3. Now you can navigate the Pi like you can normally with ssh!
4. If you want to download...
   • a folder: navigate to the parent folder of the folder you want to download and type get -r <folder name> .
   • a file: navigate to the folder (cd inside it) that contains the file you want and type get <file name> .
5. When it is finished downloading, type exit
6. You should now have the folder/file on your local machine (in your Downloads folder or the folder you were in when you type the sftp command)!

File/Folder Tree Breakdown

scheduler

• record.py is the script that handles recording
• times.txt is the text file to input scheduling of recording
• recordings folder is an empty folder to hold recordings produced by the record.py script

Dependecies

The dependencies for the record.py script is as follows...

Python:

• Python3, pip3
• pyaudio (using pip (e.g. sudo pip3 install pyaudio) or package manager (e.g. sudo apt install python3-pyaudio))

Linux:

• portaudio19-dev (portaudio library developement package) (e.g. sudo apt install portaudio19-dev)
• python-all-dev (python development package)

refer to this pages for other OS: https://people.csail.mit.edu/hubert/pyaudio/

record (.py)

• pyaudio has this weird quirk where you need to pass exception_on_overflow = False to stream.read(CHUNK, exception_on_overflow = False) (its main audio recorder, more info here)

ip-finder

• ip.sh is the script that sends the local ip address of the ip for easy ssh access if it is connected to the Internet (Go to this website: dweet.io/follow/elegant-songs)
• crontab_instructions.txt are instructions for setting up the ip.sh script to run on boot
• logs folder is an empty folder to hold logs

battery-tester

• battery_test.py is a script that simply prints out the time every minute (the idea being that once the pi runs out of power, the script will be killed when the pi shuts down)