Hi!
if you do these things, then please make a blog similar to mine, so that other
people can easly reuse it.
otherwise it would be wasted effort, if everybody has to do it from scratch
again.
cheers,
Zoff.
Nathan Hurst wrote:
> On Tue, Dec 13, 2011 at 06:53:29PM +0000, Mick Sulley wrote:
>> Yes that is pretty much the circuit I have used. The thing that feels
>> wrong to me is that the relay is energised until you turn the DS2406
>> output on.
>
> Yes, use a pnp transistor instead, emitter to v+, base to ds2406 via a
> suitable resistor, collector to the existing relay portion with diodes
> etc. That would also result in much less power dissipation when the
> device is off. Something like figure 3 here:
> http://www.rason.org/Projects/transwit/transwit.htm
> (but I wouldn't bother with the biasing 47k resistor)
>
> njh
>
>>
>> Mick
>>
>> On 13/12/11 16:49, Zoff wrote:
>>> Hi!
>>>
>>> you can take a look at my 1wire relay. maybe its of some use to you:
>>>
>>> http://1wire.zoff.cc/2010/09/18/31
>>>
>>> it uses a DS2406 and a normal relay to switch high power loads
>>> it can easly switch 220V loads, but i take no responsibility if you
>>> house burns down!
>>>
>>> i have 2 of those in use 24/7 since Sept. 2010, but only with low Watt
>>> loads for now.
>>>
>>>
>>> cheers,
>>> Zoff.
>>>
>>> Mick Sulley wrote:
>>>> Hi Jerry,
>>>>
>>>> Your system sounds interesting. I also have a control system based upon
>>>> 1-wire and Python which controls a solar (hot water) heating system
>>>> heating the domestic hot water and a swimming pool. My plan is to
>>>> extend it to control the whole of the central heating system as well.
>>>>
>>>> Reliability is key to this sort of project and each time I have had a
>>>> failure (there have been a few!) I have tried to identify the root cause
>>>> and prevent it happening again, but this is an ongoing task.
>>>>
>>>> I use a mix of home brew outputs based on DS2406, and X-10 to drive
>>>> valves and pumps. X-10 seemed the easy way to go but has not proved to
>>>> be very reliable and so I am moving to the DS2406 solution. What do you
>>>> use for driving outputs? It seems to be quite difficult to get
>>>> something that is fail safe, i.e. fails to off rather than on.
>>>>
>>>> In terms of timing, my system reads all the temperatures, currently 26
>>>> sensors, then sets the outputs according to the logic and logs all the
>>>> data to a MySQL database. This takes around 20 seconds and it then
>>>> loops round again.
>>>>
>>>> User interaction is by a local web page in PHP which reads and writes to
>>>> the database.
>>>>
>>>> It runs on a server built from an old PC, located in the loft. I have
>>>> also built a second similar server, so that I can easily swap the plugs
>>>> over if the first server fails.
>>>>
>>>> I have notices that many people use hubs to split their 1-wire networks,
>>>> currently mine is a single network with everything on it. I would be
>>>> interested to hear views on the use of hubs, do they improve reliability
>>>> or speed? Are there other advantages?
>>>>
>>>> Cheers
>>>> Mick
>>>>
>>>> On 12/12/11 22:19, Jerry Scharf wrote:
>>>>> Hi,
>>>>>
>>>>> I'm finally finding some time to write the next generation of my home
>>>>> control system. I have had a number on control ideas I have wanted to
>>>>> try out, and it is time to give them a try. The control and sensor
>>>>> plant
>>>>> in my house is close to ridiculously complex.
>>>>>
>>>>> One fun thing is that I am getting rid of the ability for users to set
>>>>> the room target temperature. Instead, there will be buttons that say
>>>>> "I'm cold" and and "I'm hot". Push once if you are a little so, push
>>>>> more than once if you are really so. The rest is figured out by the
>>>>> control system.
>>>>>
>>>>> This comes from my belief that 72F is a random control knob that has no
>>>>> real meaning to a person in a room. If you want to prove this, go to
>>>>> the
>>>>> supermarket, pick up a room thermometer from the housewares aisle, then
>>>>> go and stand in the section where the frozen food is. How cold do you
>>>>> feel, what's the temperature say. Odds are you feel colder and the
>>>>> temperature says it's higher...
>>>>>
>>>>>
>>>>> I am building this in python/django (ruby on rails for python) an a
>>>>> linux box. There is a database at the center of things and I want to
>>>>> make the various parts to be independent processes. I want this so I
>>>>> can
>>>>> do things like replace the heating controls without impacting the
>>>>> ventilation and cooling code at all.
>>>>>
>>>>> The 1 wire reading is pretty easy, I create a process for each bus and
>>>>> each process pulls the list to read, finds which ones are on its bus,
>>>>> reads them and stores them into the database. Each process is self
>>>>> scheduling (easy pieces built into python for this.)
>>>>>
>>>>> I am having more trouble deciding on partitioning the controller and
>>>>> driver parts. Part of this comes from how to make things stable and
>>>>> simple, part comes from needing to decide where different functions
>>>>> should be done.
>>>>>
>>>>> I don't think each process should be accessing the control points
>>>>> directly, these are mostly done via a mport box interfacing RS485 nudam
>>>>> controller pods. Having each one setting up telnet sessions and writing
>>>>> whenever they think it's reasonable does not seem like the path to
>>>>> reliability.
>>>>>
>>>>> I also want to be able to do things like:
>>>>> Almost all controls are variable, and I want to use this. So when a
>>>>> zone
>>>>> calls for heat, it wants to open the water valves in a particular
>>>>> stepped pattern, go to an higher than final flow rate for a period of
>>>>> time (based on the lag of the zone) and then return to the final flow
>>>>> rate until the temperature reaches the target.
>>>>>
>>>>> This means that a single valve may be getting new position commands
>>>>> every 10 seconds or so during the startup phase. I have plenty of
>>>>> signalling bandwidth and there is plent of slow in the control
>>>>> system, I
>>>>> just don't want to swamp either the database or the cpu by having lots
>>>>> of processes polling every second. I also don't want t be waiting 15s
>>>>> for something to happen that was only supposed to be there for 10s.
>>>>>
>>>>>
>>>>> I would like opinions on two things:
>>>>> Do you think that things like start-up patterns should go in the
>>>>> heating controller or the driver?
>>>>>
>>>>> What method makes a reasonable balance of simplicity,
>>>>> efficiency and
>>>>> response for passing actions between the controllers and drivers?
>>>>>
>>>>> All other kibitzing is also welcome.
>>>>>
>>>>> jerry
>>>>>
>>>>>
>>>>> ------------------------------------------------------------------------------
>>>>>
>>>>> Learn Windows Azure Live! Tuesday, Dec 13, 2011
>>>>> Microsoft is holding a special Learn Windows Azure training event for
>>>>> developers. It will provide a great way to learn Windows Azure and
>>>>> what it
>>>>> provides. You can attend the event by watching it streamed LIVE online.
>>>>> Learn more at http://p.sf.net/sfu/ms-windowsazure
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>>>>> Owfs-developers@lists.sourceforge.net
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