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Re: Pi 3 B+: Needs Cooling?
On 12 Jan 2019 11:09:16 GMT

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Indeed.   :-)


Re: Pi 3 B+: Needs Cooling?
"A. Dumas" wrote:
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No, it's a name and thus capitalised.

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Re: Pi 3 B+: Needs Cooling?
On 12/01/2019 12:57, Axel Berger wrote:
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If would seem that it's either a 'kelvin' or a 'degree Kelvin'

Just as amperes are not Amperes.


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Climate Change: Socialism wearing a lab coat.

Re: Pi 3 B+: Needs Cooling?
Axel Berger wrote:
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It might be in German, looks like it from Wikipedia (although they might be
wrong), but definitely not in English (or Dutch, the other language I know
well).


Re: Pi 3 B+: Needs Cooling?


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https://www.nist.gov/pml/weights-and-measures/writing-metric-units says that
all SI units start with a lower-case letter (except at the beginning of a
sentence) even though the symbol for some of them is a capital letter:

watt (abbreviated W)
kelvin (K)
amp(ere) (A)
farad (F)

For some reason, temperatures are expressed in "degrees Celsius", "degrees  
Fahrenheit" or "kelvin", even though all three are names of people.

I wonder if the units which are abbreviated to capital letters are those
which are named after people. Or is that "rule" too simplistic?  


Re: Pi 3 B+: Needs Cooling?
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Pa(scal), (V)olt, (S)iemens, (T)esla etc.


Re: Pi 3 B+: Needs Cooling?
following:


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    You omitted "degrees Rankine" <G>



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Re: Pi 3 B+: Needs Cooling?
Bieber wrote:
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Does anyone actually use that scale, and more than (say) Reaumur?

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Cheers,
 Daniel.
  


Re: Pi 3 B+: Needs Cooling?
"A. Dumas" wrote:
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I stand corrected.

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Re: Pi 3 B+: Needs Cooling?
On Sat, 12 Jan 2019 11:09:16 +0000, A. Dumas wrote:

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and temp is always quoted as XX kelvin not xx degrees kelvin



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Re: Pi 3 B+: Needs Cooling?
On 12/01/2019 10:37, Jan Panteltje wrote:
[]
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Celcius, with a power of 10 multiplier.

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Cheers,
David
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Re: Pi 3 B+: Needs Cooling?
On a sunny day (Sat, 12 Jan 2019 11:21:13 +0000) it happened David Taylor

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Wrong

Just add 273.15
But can he do that ;-)

Re: Pi 3 B+: Needs Cooling?
On 12/01/2019 12:06, Jan Panteltje wrote:
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The value from my RPi is 46002, which is Celcius with a multipler of  
1000.  As I said.

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David
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Re: Pi 3 B+: Needs Cooling?
On 12/01/2019 14:28, David Taylor wrote:
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This wretched spelling checker!  Celsius, of course!  No I must find how  
to remove the incorrect spelling from the dictionary!

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Cheers,
David
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Re: Pi 3 B+: Needs Cooling?
On a sunny day (Sat, 12 Jan 2019 14:31:16 +0000) it happened David Taylor

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Yes, that is true,
but my question was to display it in KELVIN ;-)
  
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I do not take English spelling serious all the time,
in fact like to make fun of it, see my posting in .. politics oh well, this text:
 Will the army take control
 and will the Precedent of the most powderful nazion in the world
 be held at quantanamo bay?

:-)
Will he?


Re: Pi 3 B+: Needs Cooling?
On 12/01/2019 15:15, Jan Panteltje wrote:
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So just add 273.15 (or 273150) to the retrieved value, as advised.

As a native English speaker I do try and keep to correct usage (plural's  
with apostrophe's being an exceptionally annoying misuse!), but I'm  
painfully aware that my command of other languages is typically much  
poorer than other's command of English, so I try to be as tolerant as  
possible!  Even to the extent of wishing that Delphi/Pascal was case  
sensitive!  I love your misspelling above!

BTW: I do plot CPU temperature and other parameters for my flock of  
Raspberry Pi cards, for example:

   https://www.satsignal.eu/mrtg/performance_raspi-7.php

--  
Cheers,
David
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Re: Pi 3 B+: Needs Cooling?
David Taylor wrote:
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Nice. How do you assess cpu load? My solution:
https://github.com/ednl/shellscripts/blob/master/cpuload



Re: Pi 3 B+: Needs Cooling?
On 12/01/2019 17:05, A. Dumas wrote:
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The SNMP variable shows percent CPU free, so I subtract that from 100!  
MRTG target:

   100 - .1.3.6.1.4.1.2021.11.11.0

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Cheers,
David
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Re: Pi 3 B+: Needs Cooling?
On a sunny day (12 Jan 2019 17:05:17 GMT) it happened A. Dumas

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root@raspberrypi:~/compile/pantel/xgpspc# top | grep Cpu
%Cpu(s): 52.4 us, 46.8 sy,  0.0 ni,  0.5 id,  0.0 wa,  0.0 hi,  0.3 si,  0.0 st
%Cpu(s): 62.7 us, 37.3 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st

?

Re: Pi 3 B+: Needs Cooling?
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Thanks :-)

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That is very nice, I have dump1090 running on one raspi, not all the time though.
A yagi that is impressive! I just use the simple antenna that came with the DVB-T stick.
As height is relative to receiver, or covered distance is 4.( sqrt(height1) + sqrt(height2) )
my height at ground level has no effect on a plane that is at 30000 feet... eehh 10 km eh...
The stick is omni directional.
You then get this:
 
http://panteltje.com/pub/xgpspc_5_planes.gif
dump1090 with a bit of extra processing...



I was beamed down in the Netherlands, and they told me I was an earthling,
for the rest ?

I schools here they were quite active teaching languages
French, English, German, and Dutch, French started at kindergarten already.
I spend quite some time in the UK and US, so that makes English even easier for me.

root@raspberrypi:~/compile/pantel/xgpspc# uptime
 19:15:20 up 11 days,  7:37,  9 users,  load average: 2.53, 2.84, 2.88

root@raspberrypi:~/compile/pantel/xgpspc# temperature
temp55%.7'C

That raspi also has  GPS / GLONASS module on its serial port /dev/ttyAMA0
root@raspberrypi:~/compile/pantel/xgpspc# cat /dev/ttyAMA0
13,14,3519,18,043,12,22,04,338,,24,35,140,20*70
$GPGSV,4,3,13,25,67,266,30,29,24,197,25,31,08,304,17,32,40,275,18*79
$GPGSV,4,4,13,39,10,116,*46
$GPGLL,5315.07733,N,00535.97261,E,183315.00,A,A*6E
$GPRMC,183316.00,A,5315.07763,N,00535.97283,E,0.676,,120119,,,A*70
$GPVTG,,T,,M,0.676,N,1.253,K,A*21
$GPGGA,183316.00,5315.07735.97283,E,1,08,0.97,-4.8,M,45.7,M,,*70
$GPGSA,A,3,24,02,29,19,25,32,12,14,,,,,1.97,0.97,1.71*03
$GPGSV,4,1,13,02,26,106,19,03,04,357,,06,25,066,,12,74,067,16*76
$GPGSV,4,2,13,14,35,300,21,19,18,043,12,22,04,338,,24,35,140,20*70
$GPGSV,4,3,13,25,67,266,30,29,24,197,24,31,08,304,17,32,40,275,18*78
$GPGSV,4,4,13,39,10,116,*46
$GPGLL,5315.07763,N,00535.97283,E,183316.00,A,A*64
$GPRMC,183317.00,A,5315.07766,N,00535.97253,E,0.397,,120119,,,A*73
$GPVTG,,T,,M,0.397,N,0.735,K,A*2F
...
etc etc...
Wrote the decoding software for that too.

I also run a server for the image (as above) on this raspi,
and wrote an app for the PC that records with ffmpeg to H264 as movie all day long,
that is my main log now... all data included, just play back fast forward...
Some shipping AIS is also logged as text file on the raspberry though.

Old raspi, one of the first 'B', single processor, only 2 USB connectors.
It also logs CO level, and temperature + humidity, air pressure, all in the movie it makes.
Easy way out..... video log :-)

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As to 'sat signal' I am (radio ham license) working on receiving the Es'hail 2  geostationary satellite
ham radio transmitter, was just launched a few weeks ago by SpaceX, now moving to its final position.
Movable 87 cm motorized dish.

OK, posting gets long...
  

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