Pi 3 B+: Needs Cooling?

Celsius...

Apropos of whatver, silicon junction temperatures can go as high as

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Reply to
The Natural Philosopher
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No, it's a name and thus capitalised.

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Reply to
Axel Berger

If would seem that it's either a 'kelvin' or a 'degree Kelvin'

Just as amperes are not Amperes.

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Reply to
The Natural Philosopher

Yes, that's about the limit for it to destruct instantly. But anything above, say, 100 Cel will make the device degrade much faster. Unwanted diffusion is a slow process and temperature determines how slow.

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Reply to
Axel Berger

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).

Reply to
A. Dumas

On 12/01/2019 12:06, Jan Panteltje wrote: []

The value from my RPi is 46002, which is Celcius with a multipler of

1000. As I said.
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Reply to
David Taylor

This wretched spelling checker! Celsius, of course! No I must find how to remove the incorrect spelling from the dictionary!

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Reply to
David Taylor

On a sunny day (Sat, 12 Jan 2019 14:31:16 +0000) it happened David Taylor wrote in :

Yes, that is true, but my question was to display it in KELVIN ;-)

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?

Reply to
Jan Panteltje

formatting link
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?

Reply to
NY

I stand corrected.

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Reply to
Axel Berger

Pa(scal), (V)olt, (S)iemens, (T)esla etc.

Reply to
A. Dumas

On 12/01/2019 15:15, Jan Panteltje wrote: []

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:

formatting link

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Reply to
David Taylor

Nice. How do you assess cpu load? My solution:

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Reply to
A. Dumas

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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Reply to
David Taylor

Thanks :-)

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:

formatting link
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 temp=55.7'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 :-)

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...

Reply to
Jan Panteltje

On a sunny day (12 Jan 2019 17:05:17 GMT) it happened A. Dumas wrote in :

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

?
Reply to
Jan Panteltje

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

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Reply to
Alister

On Sat, 12 Jan 2019 16:04:31 -0000, "NY" declaimed the following:

You omitted "degrees Rankine"

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Reply to
Dennis Lee Bieber

It is a power law.

Below 100C frankly its forever

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Reply to
The Natural Philosopher

Hello druck!

Friday January 11 2019 22:37, you wrote to me:

Nope, that my primary linux system but I will do the same on the Pi if I get noise issues. Then it will be the issue of finding a very baby case that has suitable fan slots/holes etc but if that happens I will consider putting in a baby modular psu then I can increase the Pi board count with ease creating a real quad core system having changed the Linux job scheduler to multi box mode a la JES3.

How ever I hope that the need will not arise as my Pi uses heat conductors on both chips but it is still warm!

Must work out how to check the temps - assuming there is an internal chip componenet that does it.

There again it is a very mobo with a very low chip count and capability.

Vince

Reply to
Vince Coen

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