Environmental monitoring
Jonathan Dill
jonathan at nerds.net
Mon Apr 21 17:29:45 CEST 2008
On Apr 21, 2008, at 10:33 AM, Jay R. Ashworth wrote:
> On Sun, Apr 20, 2008 at 11:37:10PM +0200, Thomas Althoff wrote:
>> 1-Wire is your friend http://en.wikipedia.org/wiki/1-Wire plus
>> http://www.owfs.org/
>>
>> I have 8 senors in my rack ~$150. One sensor + usb 1-wire ~$30-40
>
> Aha!
>
> Thanks. It ain't wireless, but at the price, I also don't care. :-)
Also, it's all cabled together with inexpensive satin cable and RJ11
plugs, probably more reliable to use a powered hub though if you have
more than a few sensors, but you can always try that later if you have
problems. You do have to be careful which pin goes to ground or + it
probably won't damage anything but the device will not be seen if you
cross the wires. Cheap "biscuit" phone jack can be useful for testing
and troubleshooting, that makes it easy to switch + and ground if you
think that may be the problem. Finally, a use for all of that Mac
PhoneNet / Gator / serial Terminal Server junk that you never quite
got around to throw away, lol.
Jonathan
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