>
>
> 1. VFD for small blower/pump (50-300W 220V). I plan to use one DC PSU and
> 10-20 1W "inverters", possibly based on DS2890 (one for voltage, one for
> frequency). Found no matching solutions, even no drivers, except the
> professional expensive controllers like Siemens with build-in PSU. I can
> make a board but have no experience with MC's and there is MAXIM restriction
> for 1W slave device's. Whether any decisions is done for 1W management of AC
> motor speed?
>
There are solenoid drivers and the like with 1-wire control. There are also
published designs for 1-wire SLAVES based on the PIC micro. Search the
developer's list archives.
http://www.mail-archive.com/[email protected]/msg00667.html
http://www.sq-1.com/sctoc.html
|
2. Multiple 1W buses for various tasks (one bus for HVAC, another for
heating and etc). 10-15 USB adapters for about 150 devices, 10-20 devices
per bus. Each adapter is connected to physical USB port (4-8 build-in and
4-10 on PCI controllers) and owfs runs as "owfs /dev/bus/usb0 /1wire/Line0;
owfs /dev/bus/usb1 /1wire/Line1...........". Found nothing in doc's about
routing and reliability. Need independent 1W buses - some in overdrive,
other not. Any reference to device in /1wire/Line0 must do nothing to other
lines and devices. If one adapter fails, nothing happens to other. Can be
difficulties? Could anything change after reboot or it goes stable?
|
OWFS handles multiple adapters seemlessly. There is no specified limit on
the number, but I haven't tried 10-15. You can also partition the master
among multiple machines, or multiple instances of owserver on the same
machine. The overhead is minimal.
It's up to you whether you want to use owfs and use the filesystem
interface, or owserver and use a programming language. I'd probably use
owserver for groups of adapters and then aggrgate them under owfs or
owserver. That way you can partition the system (perhaps putting some of the
more distant devices on a separate machine or embedded device and
communicating over the network).
USB has an issue with enumeration -- the same adapter will be assigned a
different slot. We try to search for the unique ID (family code 81) when
"reconnecting" but it's a fundemental limitation of the operating system.
Probably your code should search through all adapters for known slaves and
make assignments dynamically.
>
>
> 3. I want to use Linux-HA http://linux-ha.com/ for a 2 servers cluster and
> here comes serious trouble, that has never been discussed - a "splitbrain",
> http://linux-ha.com/SplitBrain. Partially solved by 1W eeprom's. How is
> possible to share 1W lines between 2 servers (2 USB)? I will make USB-1W
> adapters and could provide this. May be 2 adapters connected to one 1W net?
>
Two adapters can be connected to the same 1-wire net as long as only 1 is
active. Can you poll and switch over? Again, I haven't actually tried this.
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