Links to Raspberry Pi projects!

[Jo Sugiura]

Here are where you can find more information on the Raspberry Pi projects I shared last night.

GPS-backed NTP server
=====================
http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html
https://www.adafruit.com/product/2324
Notes :
- The GPS module sends PPS on a GPIO pin and NMEA-formatted GPS data over UART.
- The ntpd compiled with Raspbian does not support Kernel PPS (pulse-per-second) needed for precise timekeeping.
- You will need to recompile ntpd from source (covered in the satsignal link).
- You will also need to wiggle some boot config settings.  Raspbian, out of the box, appears to have serial console set to UART and will get confused when it starts seeing GPS data.

Bandwidth and latency speed sign
=====================
Everything is detailed in depth here :
https://github.com/elgwhoppo/LANPartySign

ADS-B and MLAT ground station for watching planes
=====================
Instructions on how to use a PiAware image, or installing the PiAware software on an existing Raspbian installation:
https://flightaware.com/adsb/piaware/
You will also need an RTL-SDR with preferably the newer R820T2 tuner.  Hardware to buy is also covered at that website.

Power/reset button controller to remotely power up/down/reboot computers
=====================
There really isn't much to this one on the hardware side.  Follow any tutorial that covers actuating relays with GPIO pins.
The software used is unfortunately now discontinued called WebIOPi : http://webiopi.trouch.com/
A patch is required to make this function on the Raspberry Pi 2 and 3's GPIO controller : https://github.com/doublebind/raspi

Audio streaming server
=====================
I forgot to mention this one.  I have an FM radio that I'd like accessible to any computer, so I made a streaming MP3 server.
https://stmllr.net/blog/live-mp3-streaming-from-audio-in-with-darkice-and-icecast2-on-raspberry-pi/
A USB audio capture device was used for this.  https://www.amazon.com/EAS-Digital-Converter-Systems-Cassette/dp/B013E21TUK/
The only problem I remember was the sample rate of the device is fixed, but darkice lets you change it anyway to amusing results.  The hardware was fixed at at 44.1kHz, but played back at 48kHz (as was set in darkice).  Or maybe it was the other way around.  The stream played back fine, but it was off enough to notice that something wasn't right.

Possible future projects
=====================
Spotify, Pandora, SoundCloud music player : http://www.pimusicbox.com/
Home automation without the cloud : https://home-assistant.io/
An ad-blocking DNS server : https://pi-hole.net/

If anyone has questions, I'll be glad to answer them!