Simultaneous doesn't actually test for power -- it is assumed you know what
your have.
Each DS18X20 has a "power" property that can be quried to see of the sensors
are powered.
Paul Alfille
On 7/28/07, Mark Cheeseman <[EMAIL PROTECTED]> wrote:
>
> Paul Alfille wrote:
> > The sensors must be in t
Paul Alfille wrote:
> The sensors must be in the same 'directory', (branch) since that's the
> only way they can get selected simutaneously.
I'm curious (mainly because I wasted almost a day trying to work out why
I couldn't get power to a couple of AAG sensors, only to find out they
had actuall
On 7/28/07, Matthias Urlichs <[EMAIL PROTECTED]> wrote:
> > Actually, that's what that "simultaneous" entry is for.
> > echo "1" > /1wire/simultaneous/temperature
> >
> Does that work if the sensors are behind hubs?
> How does that feature interact with the cache?
>
The sensors must be in the same
Hi,
Paul Alfille:
> Actually, that's what that "simultaneous" entry is for.
> echo "1" > /1wire/simultaneous/temperature
>
Does that work if the sensors are behind hubs?
How does that feature interact with the cache?
--
Matthias Urlichs | {M:U} IT Design @ m-u-it.de | [EMAIL PROTECTED]
D
On 7/22/07, Andrew Burgess <[EMAIL PROTECTED]> wrote:
I misremembered the 300 msec number. This is what my old code does:
switch(o->type) {
case TEMPERATURE_1820:
o->conversion_time = 350; // cold sensors really need this
much
break;
>> hmmm. I seem to recall seeing it done elsewhere (not owfs) as:
>>
>> tell all the temperature sensors to start a conversion
>> wait 300ms
>> read all the sensors
>Actually, that's what that "simultaneous" entry is for.
>echo "1" > /1wire/simultaneous/temperature
Cool!
>The delay will s
On 7/18/07, Andrew Burgess <[EMAIL PROTECTED]> wrote:
>> B: would +5V external rather than parasitic powered DS help?
hmmm. I seem to recall seeing it done elsewhere (not owfs) as:
tell all the temperature sensors to start a conversion
wait 300ms
read all the sensors
Actually, that's
>> B: would +5V external rather than parasitic powered DS help?
>Well, somewhat. The point is that if you use external power the
>converter will tell the host when it's done. Otherwise you have to
>wait however long a pessimistic estimate of the conversion time is.
>My own measurements were measu
On 6/20/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
I've only been playing with owfs for about two days: I hadn't yet found
'uncached' in the documentation. That sounds like it'll do what I need.
You're right! I quickly looked through the documentation, thinking "that
can't be right...
>> A: is there a way to force new acquisition with each request?
>
> if you do a "ls /mnt/1wire" you see a couple of special directories. One
> is named "uncached". That should be evocative enough ...
I've only been playing with owfs for about two days: I hadn't yet found
'uncached' in the docume
On 6/20/07, Matthias Urlichs <[EMAIL PROTECTED]> wrote:
... except that it's uncached/10.(blah)/temperature...
Oops. Oh well, the concept is clear.
> [ full quote without any changes ]
Please don't do that.
Sorry.
-
Hi,
Doug Collinge:
> "mnt/1wire/10.(blah)/uncached/temperature" then you force a device read on
... except that it's uncached/10.(blah)/temperature...
> On 6/20/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> > [ full quote without any changes ]
Please don't do that.
--
Matthias Urlichs
Hi,
[EMAIL PROTECTED]:
> The problem is that sequential samples of the DS indicate to me that I'm
> not actually getting updated information, just the same thing I got last
> time.
That's by design.
> A: is there a way to force new acquisition with each request?
if you do a "ls /mnt/1wire" you
Sounds like you are rereading the cached data, which makes the whole thing
seem faster if there are multiple clients for the same data. If you read
"mnt/1wire/10.(blah)/uncached/temperature" then you force a device read on
each access.
On 6/20/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
I
I've done some searching on google and within this newsgroup itself to try
and answer this question but haven't yet found anything so I figured I'd
ask in the hopes it's an easy answer.
I'm using a DS18S20 and a parallel-port-driven relay to model a furnace
control system: the DS is taped to a lig
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