Hi Colin,
I wonder if OWFS can already do what you want. If not, I have some ideas.
OWFS has a simultaneous command to trigger temperature conversion.
1. It works on all the sensors on a bus, using the trick that there is a
command to select the single slave on a 1-slave bus (for efficiency)
Hi Paul,
Thanks for the detailed response.
Yes, the concern is power draw. We find that converting groups of
sensors simultaneously by ROM actually scales quite well. Using the TMEX
API, you can easily issue a Skip ROM (xCC) followed by a Convert Temp
(x44) to convert all devices
What interface do you you use for these reads? We could make owread (or the
owcapi interface) multithreaded.
On Fri, Jul 11, 2014 at 1:27 PM, Colin Reese colin.re...@gmail.com wrote:
Hi Paul,
Thanks for the detailed response.
Yes, the concern is power draw. We find that converting groups
Which physical interface? Typically DS2483s, sometimes DS9490, and also
the LinkUSB, although I've only so far used the LinkUSB on my Windows
boxes with LabVIEW and ibfs64.dll and the TMEX API.
If you meant which interface abstraction, I mount owfs to owserver.
Colin
On 7/11/2014 10:37, Paul
Paul,
I would like to +1 this ability. I have a couple buses that have more
sensors than I would like because of physical limitations. I have
regular stability problems with simultaneous reads. After reading this,
I suspect that I am at the limit of the power available on the these
buses for
Hello,
After talking with iButtonLink, it was brought to my attention that without
additional power, it is possible to have unsuccessful simultaneous read if
too many sensors are on the network, due to current draw during the
conversion.
Using the TMEX API, I can perform a match ROM and then
Colin,
Unless the devices are externally powered that won’t work reliably. For
instance a DS19S20 requires a strong pull-up during the entire conversion time
so if you are issuing more Match ROM commands during the conversion time the
bus activity may keep the DS18S20 from completing the
Understood, but that's fine. Pretend I included the provision that the
devices are not in parasite mode.
Colin
On Thu, Jul 10, 2014 at 11:50 AM, Eric Vickery eric...@hobby-boards.com
wrote:
Colin,
Unless the devices are externally powered that won’t work reliably. For
instance a DS19S20
Like I said, it works great using the TMEX API. I use LabVIEW with it.
Colin
On Thu, Jul 10, 2014 at 2:36 PM, Colin Reese colin.re...@gmail.com wrote:
Understood, but that's fine. Pretend I included the provision that the
devices are not in parasite mode.
Colin
On Thu, Jul 10, 2014 at
