Am 01.08.2017 um 20:09 schrieb Dr. Trigon:
>
> owserver-deamon that would be needed to run on the Raspi Zero W e.g.,
> means running 'owserver' binary, right?
>
Yes,sure.
> The reason why I wanted to avoid running another instance of owserver
> in the first place, was power consumption
>
Wifi is going to eat your battery. The CPU does mostly nothing and will
eat <1/10 of Wifi.
Also, if you want to save energy, you should use one of the "commercial"
Onewire host adapters, e.g. the DS2483. Bitbanging wakes up the CPU on
every bit sent and this will eat a lot of energy. (But still *nothing*
compared to Wifi.)
> and the fact that importing
> owfs instances from other machines might be a bit problematic (or
> connecting to other instances using the -s option). I read a few
> comments about this, don't know.
>
These most likely came from people who have problems setting their stuff
up correctly and mixing up things.
> Regarding power, I assumed the
> processors consumption (avr vs. arm, yun vs. raspi) and the number of
> processes running does matter, but if wifi dominates that might be
> wrong here. (And thus even an uno with wifi shield consumes the
> same.)
>
With only one core, there is only one process running. All the other
processes are waiting in the scheduler queue. What effects energy
consumption of the CPU in a non-number-crunching application is the
number of interrupts to service. That is because each interrupt means
waking up the CPU from sleep. All other effects are neglible.
You don't have to count processes, you have to count interrupts. Wifi
produces a lot. Timer produces an awful lot when the CPU has to bitbang
things.
Kind regards
Jan
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