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Christopher Stubbs

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1. VPN

vpn.rc.fas.harvard.edu 

stubbs@fasrc

Google authenticator code for FASRC


2. login

ssh stubbs@login.rc.fas.harvard.edu

cat4FARC!

google authenticator code. 

ssh stubbs@graph01.rc.fas.harvard.edu

raspberry PI direct access by 

ssh pi@10.245.20.16

lisefasrc-bang


cd to
/home/pi/Desktop/lise_magnet/data


there are individual circular buffer data files, timestamp is seconds after Unix epoch. Need a converter for that: for OSX:

date -r 123439819723 '+%m/%d/%Y:%H:%M:%S'

then 3 axes of B field data

3. data access


mapping of IP to physics locations at

https://hu.sharepoint.com/:x:/r/sites/DeanofScience/_layouts/15/Doc.aspx?sourcedoc=%7BE9F63980-D467-46BB-8C05-E9624622F0F7%7D&file=List%20of%20RPi%20Devices.xlsx&action=default&mobileredirect=true

Image Added


getting from Unix epoch to date on R Pi machines: 

pi@raspberrypi:~/Desktop/lise_magnet/data $ head -1 data.out.5

1669345229,34174,31034,30232

pi@raspberrypi:~/Desktop/lise_magnet/data $ date --date="@1669345229"

data xfer: 

scp pi@10.245.20.23:~/Desktop/lise_magnet/data/data* . 
but beware duplicate file names! 


Status on Dec 16 2022

deviceoldestnewestnotes
RIPIR1

Mon 21 Nov 2022 02:48:59 PM EST

Tue 13 Dec 2022 01:11:58 PM EST

data collection died on Dec 13
2022-12-13-13-11-18 socket write successfull
2022-12-13-13-11-48 socket write successfull
2022-12-13-14-46-19 Error: Arduino serial port is idle.
2022-12-13-16-20-40 Error: Arduino serial port is idle.
2022-12-13-17-55-01 Error: Arduino serial port is idle.

RPIR2

ssh: connect to host 10.245.20.26 port 22: Network is unreachable

RPIR3

ssh: connect to host 10.245.20.25 port 22: Network is unreachable

PRIR4

Thu 24 Nov 2022 10:00:29 PM EST

Fri 16 Dec 2022 09:09:15 PM EST

this one seems to be working. 
RPIR5

Fri 25 Nov 2022 12:04:35 PM EST

Fri 16 Dec 2022 09:18:51 PM EST

also working
RPIR6Dec 15

Fri 16 Dec 2022 09:31:44 PM EST

also working, but taking data at 1 Hz not 1/10 Hz. . Only a few days of data stored
RPIR7Nov 30 Dec 16 working OK
RPIR8Nov 30 Dec 15working OK
RPIR9Nov 30 Dec 16working OK
RPIR10

ssh: connect to host 10.245.20.18 port 22: Network is unreachable

RPIR11Nov 29 Dec 15

working OK

RPIR12Nov 29Dec 16working OK


data storage estimate. 

3 axes plus timestamp, over around 3 weeks, requires 5.3M

empty disk space is around 27G

So we could store 4500 times as much data. That's enough for two centuries. 


...


Tool for conversion of JSON to CSV files: dasel on MAC. brew install dasel

$ dasel -r json -w csv < sample.json 
color,id,value
red,1,#f00
green,2,#0f0
blue,3,#00f

Nope, didn't work. Evidently json2tsv works better?