Rpi External Drive
https://www.raspberrypi-spy.co.uk/2014/05/how-to-mount-a-usb-flash-disk-on-the-raspberry-pi/
RPI VIDEO AUDIO
REPAIR SDCARD
“Structure needs cleaning”
sudo umount /dev/sda1
sudo fsck -y /dev/sda1
This second command might need to be run twice. You need to confirm the disk location could be sdc2, etc.
Overview
Follow the above guide for installing an OS, with the only exception you will be installing the version of Raspian with desktop.
Connect RPI to monitor, keyboard, and mouse.
Boot RPI
Add a powered speaker to the audio out port. I have not found that USB speakers work well.
Choose preferences/audio devices and configure your speaker
Navigate to a site that supports sound files and test audio out.
Add a USB camera with microphone.
Test the microphone by running the following:
arecord –device=hw:1,0 –format S16_LE –rate 44100 -c1 test.wav
This will record signed 16-bit (S16_LE) audio at 44100 Hz (–rate 44100) mono (-c1) audio to test.wav.
You can have a little VU meter show up if you add to the-V mono command line. Press control-C to quit
Test the wave file by running the command:
aplay test.wav
Enable the microphone in Chrome under Settings/Advanced/Content settings
Test the video and microphone using either Jitsi or Google Hangouts
EAGLE
Trace width
Drill: 40
Shape: Long
Diameter: Auto
Trace: 18
Before making a schematic you must power your board by your desired power supply.
All boards must have four mounting holes for 2.5M bolts
All boards must be based on a ATMega328 (not a Metro Mini or Arduino Uno)