Colin Reese colin.reese at gmail.com writes:
My experience with i2c (2483) on 2.8p15 was at first double and
intermittent probes and then no probes. I upgraded to 2.9 and everything
works.
Hi Colin,
Was it on a Raspberry Pi?
Did you compile on the Pi itself?
The 2.9p1 and 2.9p0 release
In order to explore simultaneous temperature readings I have set up two
DS1820 with VDD connected to +5V and executed the commands below. As can
be seen from the resulting output writing to
/ow/simultaneous/temperature takes only 40 ms instead of the expected
0.7 s and the two temperature readings
What you do here is that you initiate a simultaneous read, and force two
simple reads after as well. You should initiate the simultaneous read, wait
1-2 seconds, and read the cached values.
Attila
On Thu, Oct 10, 2013 at 1:11 PM, Håkan Elmqvist hak...@smeden.org wrote:
In order to explore
It is on an RPi. I'll have to check to see whether its 2.9p0 or 2.9p1. I'll
begin more complete testing this week and will get back to you.
I recompiled on the Pi after finding a google hit from this group on ds2483.
Colin
On Oct 10, 2013, at 0:29, Guy COLIN guy.co...@gmail.com wrote:
Thanks a lot Attila,
that did the trick:
echo 1 /ow/simultaneous/temperature; time (sleep 1; cat
/ow/10.*/temperature;)
22.9375 22.875
real0m1.292s
user0m0.000s
sys0m0.000s
--
October Webinars:
And here is the result for 12 DS1820:
root@hemx:~# echo 1 /ow/simultaneous/temperature; time (sleep 1; cat
/ow/10.*/temperature;)
23.5 23.3125 23.37523.5 23.2523.5
23.375 23.37523.523.5 23.5625 23.375
real0m1.944s
user
doesn't 'cat /ow/10.*/temperature' initiate a simple read?
Colin
On Thu, Oct 10, 2013 at 9:25 AM, Håkan Elmqvist hak...@smeden.org wrote:
And here is the result for 12 DS1820:
root@hemx:~# echo 1 /ow/simultaneous/temperature; time (sleep 1; cat
/ow/10.*/temperature;)
23.5
Hi,
Are these 18s20s? I am used to seeing higher resolution on the
temperature from 18B20s.
You can actually take the sleep out of there. The first read will stall
until the conversion completes and then the rest will happen at the bus
transaction speed.
I always used the uncached directory
One more thing. I also do uncached reads of a rom fixed value like
address to account for the actual bus transaction time. This gives a
lower bound on how fast things can go.
jerry
On 10/10/2013 10:08 AM, Jerry Scharf wrote:
Hi,
Are these 18s20s? I am used to seeing higher resolution on the
Yes, it does, a simple read of the temperature registers, that just have
been updated by the write to /ow/simultaneous/temperature if that was
your question otherwise the little * does the globbing for us.
2013-10-10 18:39, Colin Reese skrev:
doesn't 'cat /ow/10.*/temperature' initiate a simple
1) Yes they are:
cat /ow/10.*/type; gives me
DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20root@hemx:~#
cat /ow/10.*/type; echo
DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20
2) It doesn't seem to matter:
root@hemx:~#
To get a proper answer to that question you will have ask Paul Afille.
But my understanding is that owfs remembers that it recently has issued
a skip rom command.
H
2013-10-10 22:08, Colin Reese skrev:
That was my question. my understanding was that when I execute the
read of the file, the
Am 10.10.2013 22:17, schrieb Håkan Elmqvist:
To get a proper answer to that question you will have ask Paul Afille.
But my understanding is that owfs remembers that it recently has issued
a skip rom command.
If I understand the sources correctly: not Skip ROM in general, but
the time the
perfect. thank you.
On Thu, Oct 10, 2013 at 2:43 PM, Jan Kandziora j...@gmx.de wrote:
Am 10.10.2013 22:17, schrieb Håkan Elmqvist:
To get a proper answer to that question you will have ask Paul Afille.
But my understanding is that owfs remembers that it recently has issued
a skip rom
for me, this don't work with hubs at onewire, just the first bus
2013/10/10 Jan Kandziora j...@gmx.de
Am 10.10.2013 22:17, schrieb Håkan Elmqvist:
To get a proper answer to that question you will have ask Paul Afille.
But my understanding is that owfs remembers that it recently has issued
Yes that is what I see as well. I have a hobbyboards hub and
simultaneous doesn't work for me.
On 10/10/13 22:46, Roberto Spadim wrote:
for me, this don't work with hubs at onewire, just the first bus
2013/10/10 Jan Kandziora j...@gmx.de mailto:j...@gmx.de
Am 10.10.2013 22:17, schrieb
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