On 07/22/2013 14:55, Jan Sennesael wrote:
> I have several DS18x20 sensors in my network, some DS18S20 (the first 12)
> and some DS18B20 (some more added later).
>
> Since i was unsure about some reading of some DS18S20 sensors i used a
> second DS18B20 on the same spot...
> That reading was about
every sensor must be calibrated
https://en.wikipedia.org/wiki/Calibration
in other words, get a sensor as "default", and make every others sensors
have same value for the same temperature (normally a 0 Celsius ice bath)
some ds18x20 have calibration inside rom, other must be done via external
prog
I have several DS18x20 sensors in my network, some DS18S20 (the first 12)
and some DS18B20 (some more added later).
Since i was unsure about some reading of some DS18S20 sensors i used a
second DS18B20 on the same spot...
That reading was about 2°C higher than the DS18S20... i moved it about and
i
Am 22.07.2013 10:49, schrieb Robert Budde:
>
> So my question:
>
> - What to look for? I2C or Onewire?
>
I'd look for I²C first. Hook up a scope and check if the rising signal
edges are edgy enough. I²C is picky about that. The transmission gates
in the PCA954x may round the edges addit
OWFS opens the i2c bus as a character device (like serial) and does all
communication over that. Each line is then handled independently.
So I agree with Jan, the electrical properties of the switch would be the
first place to look.
As for how to test, try a single DS2483, first directly connecte
Hi all,
I am experiencing some difficulties when using a PCA9546 i2c-switch in
conjunction with five DS2483 onewire-masters on a Beaglebone Black.
Owfs-Version is 2.9p1 (latest) and Kernel is 3.8.13 (Debian-distro).
The first DS2483 is directly connected to the "native" I2C line (/dev/i2c-1
