IARC 207 Wiki - User contributions [en]

High precision computer logger

2016-01-24T20:15:42Z

24.237.158.13:

Replace '''ntpd''' with '''chronyd''':
* http://chrony.tuxfamily.org/
Then, also add '''gpsd''':
* http://www.catb.org/gpsd/gpsd-time-service-howto.html
* In addition to gpsd you will need to modify the default configuration so that the gpsd daemon starts looking for the gps at start up:

<pre>
root@turkey:/etc/default# cat /etc/default/gpsd
# Default settings for the gpsd init script and the hotplug wrapper.

# Start the gpsd daemon automatically at boot time
START_DAEMON="true"

# Use USB hotplugging to add new USB devices automatically to the daemon
USBAUTO="true"

# Devices gpsd should collect to at boot time.
# They need to be read/writeable, either by user gpsd or the group dialout.
DEVICES="/dev/ttyUSB0"

# Other options you want to pass to gpsd
GPSD_OPTIONS="-G -n"
</pre>

Doing those two things will get you a computer that will keep time with good precision when connected to a gps & unable to access network time for extended periods. NTP works best in always connected environments.

High precision computer logger

2016-01-24T20:14:21Z

24.237.158.13: Created page with " Replace '''ntpd''' with '''chronyd''': * http://chrony.tuxfamily.org/ Then, also add '''gpsd''': * http://www.catb.org/gpsd/gpsd-time-service-howto.html * In addition to gps..."

Computers

2016-01-24T20:12:00Z

24.237.158.13:

Stub here to act as a table of contents sorts to our important computers / servers / related information.
===Loggernet Systems===
[https://docs.google.com/a/alaska.edu/spreadsheets/d/1CFV-2dh7pPBvACJbi8AFLTF7aF6Bf3JSwRjbcY5aBMY/edit?usp=sharing LoggerNet configuration] (Partial GIPL & IARC) 

===Serial Server Systems===
What is a [[Serial Server]]? 
[https://docs.google.com/a/alaska.edu/document/d/1rRO1Ess8hwZkxBgZB5HRP-FZ8u2NcKENp2TvAYmtYTE/edit?usp=sharing Fairbanks IARC Base Station server (Ralph) Configuration] 

[https://docs.google.com/a/alaska.edu/document/d/1cvtqjE0w6MpFALUuruchsc71XF1WgvOJFbtLxnAWBQo/edit?usp=sharing Barrow Base Station server (Trout) Configuration] 

[https://docs.google.com/a/alaska.edu/document/d/108gA9FC5sTJvvMaQ039XtKBFk9DH31bilRKUuF3_hq4/edit?usp=sharing Barrow BARC bandwidth tester (Grayling)Configuration ] 

Barrow Raspberry Pi 1 ''Lost in the mail *Sad Emoji*'' 
Barrow Raspberry Pi 2 ''Lost in the mail *Sad Emoji*'' 
Barrow Dreamplug -- Kind of decommissioned at this point. It is old and still up in Barrow in the control shed. Still works but I sent the raspberry pis up to replace it. My plan is to replace it with a small server with a different computer architecture this winter. The reason for that over these small ARM processors is that I'm still trying to work around this weak telemetry problem. Thinking that if it is an x86 (well 64 bit but that style of CPU) that we can leave a copy of loggernet running up there so that when the network goes down as long as the unit is on we are still in business.

===Virtual Machines===
What is a [[Virtual Machine]]? 
[[LogNet]] -- Primary LoggerNet server 
[[NGEEDATA]] -- Primary Data processing server & data sharing web server 

===Other===
[[High precision computer logger]]

===Other Important Information===
[[Initial Debian Server Setup]] 
[[Baud Rate Backgrounder]] - (I know...)

Datalogger programming

2015-10-16T19:42:30Z

24.237.158.13: /* Datalogger programming */

== Datalogger programming ==

Notes on programming details for various sensors and loggers.
===CR Basic Programmed Loggers===
* [[SR50 programming notes for CR1000]]
* [[Data Interval]]
* [[CR1000 Program Overwrite]]
===Program Instruction Loggers===

* [[Radio on - off example]]