Hi James,

I haven't had any problems with the 4-channel relay board.  It seems very well made, and there really isn't much to it.  You can see the manual here, including a schematic, if you're interested:  http://www.picbasic.it/ETTe/ET-OPTO%20RELAY4%20Manual.pdf

I use owfs to read temperatures, control relays, an LCD screen (the DS2408 based LCD support is somewhat limited at this time, and might only be available in SVN), and a push-button (using a DS2406).  The screen and push button are still just set up on a breadboard, and haven't really been "deployed", but they are working.  I use the owperl interface to owfs, which makes it pretty simple to use with MH.

This is the first heating season I've used MH, and I really just have things set up to work, but not be real feature-rich yet.  I found owfs to be easier to use than the MH built-in 1-wire code, and it supports many more devices.  The potential blocking that Gregg mentioned hasn't been a problem for me so far.  Every minute I read 10 temperature sensors and get one pause of 750ms or less.  (Admittedly I haven't verified that timing since switching to simultaneous mode, but that's how it's supposed to work.)  There could be other applications of MH where that kind of pause would be detrimental, but so far I have nothing implemented that is that time critical.

-Ben


On 1/26/07, James Paek < jpaek111@gmail.com> wrote:

Hi Ben,

Thanks to you for your reply.

The 4-channel relay board will cost me about $12.90.

Is this 4-channel relay board reliable?

I have ordered a sample package, DS2405 to Maxim yesterday.

If you don't use 1 wire xAP, How you can control on the 4-channel relay
board with DS2405?


Thanks in advance,

James


Ben Griffith wrote:
>
> Hi James,
>
> What I did for a 1-wire relay board was buy the 4-channel opto-isolated
> relay board sold by www.futurlec.com and add four DS2405 1-wire devices to
> it.  The relay board is only about $13, and there is a small empty area
> with
> plated thru-holes to make it easy to add components.  I got the DS2405
> chips
> as samples from Maxim.  hobby-boards sells them too.
>
> I got my 1-wire serial adapter from hobby-boards.com.
>
> I used DS18S20 temperature sensors obtained as samples from Maxim, and
> some
> that I purchased from hobby-boards.  I just soldered and shrink wrapped
> them
> onto phone wire and then crimped that onto my main 1-wire cable wherever I
> needed to know the temperature.
>
> I don't use a hub, as I've managed to keep everything on one straight run
> (so far).
>
> I'm not using the 1-wire xAP yet though.
>
> -Ben
>
> On 1/25/07, James Paek < jpaek111@gmail.com> wrote:
>>
>>
>> Hi Gregg,
>>
>> There are so many hardwares available in the market, But I don't know
>> where
>> to start and I do have a lot of confusions.
>>
>> I don't know which 1 wire relay boards or temperature input kits are
>> better.
>>
>> I want to have the following hardwares for my air conditioning control.
>>
>> 1. 1 wire serial adapter
>>
>> 2. 1 wire hub
>>
>> 3. 4 channel relay
>>
>> 4. temperature input kit
>>
>> All of above these has to works with 1 wire xAP.
>>
>> I am going to use  a MisterHouse headless linux system.
>>
>> My headless linux computer has the 2(two) com ports are available
>>
>>
>> Thanks to you,
>>
>>
>> James
>>
>>
>>
>> Gregg Liming wrote:
>> >
>> > Hi James,
>> >
>> > Quoting James Paek (1/24/07 6:40 PM):
>> >
>> >> I need to get the relays(heating, cooling, fan) and temperature inputs
>> to
>> >> control over the Air Conditiong System by xAP.
>> >>
>> >> Could you help me to get a more details for the software and hardware
>> >> parts.
>> >
>> > I need to better understand the specific functions that you want as
>> well
>> > as what existing hardware you have in place before offering any
>> > suggestions.
>> >
>> > Gregg
>> >
>> >
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