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 data3. data access
mapping of IP to physics locations at
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
| device | oldest | newest | notes |
|---|---|---|---|
| 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 |
| 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 |
| RPIR6 | Dec 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 |
| RPIR7 | Nov 30 | Dec 16 | working OK |
| RPIR8 | Nov 30 | Dec 15 | working OK |
| RPIR9 | Nov 30 | Dec 16 | working OK |
| RPIR10 | ssh: connect to host 10.245.20.18 port 22: Network is unreachable | ||
| RPIR11 | Nov 29 | Dec 15 | working OK |
| RPIR12 | Nov 29 | Dec 16 | working 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?