There is a table of chips and capabilities at
http://www.owfs.org/index.php?page=standard-devices
Note that a few of the candidate chips support "overdrive" which speeds the
communication 10-fold. There are clear issues with cable length at that
speed, and it may not be achievable.
There is also time needed for the actual A/D conversion. The time needed
varies with chip. We currently choose the most conservative time estimates,
but that could be tuned.
Do you need all these values sampled every 10msec, or can some of values be
less frequent? If you need them that frequently, you may need to use several
separate 1-wire busses.
Note, the filesystem is only one method of access, you can also use OWFS
directly from a program (in several languages), or over the network. In
fact, having an embedded machine on the tractor, and doing the monitoring
over the network (?wifi?) might be a very nice choice.
Paul Alfille
On 12/24/06, Stefan Eitel <[EMAIL PROTECTED]> wrote:
Hi Japie,
> Actualy my project is similar to a weather station, only the readings
are
> a bit higher but we need: rpm, temp, pressure and humidity only
"abnormal"
> thing would be a way to collect data from our trothle control (100K
> potentiometer)
It's just a thought, but maybe you can also add broadband lambda probes
(monitored through 1-Wire of course) to the system. This way you could
effectively see under which conditions the engine is running lean/rich and
optimize your injection system.
I'd be glad to see some results on your whole idea; a low-cost opensource
data logger for engines seems very promising!
Greets and good luck, Stefan
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