[SGVLUG] HAK group question: How to remote control a millivolt thermostat (circuit)

[Claude Felizardo]

Well if you are really set on DIY and you have a spare arduino, you an
pick up a couple of DS18S20 (or is it B now?) 1-wire temperature
sensors and string around with CAT-3 or CAT-5 cable.  I've got about 7
strung around the house and attic and if I ever find time I'll run a
few more.  You should be able to find them for between $2 and $5.
Parasitic power is usually fine for the first few as long as you have
a single run - don't do a star network unless you plan to add
switches!

Claude


On Mon, Dec 10, 2012 at 12:28 AM, Homan Chou <homanchou at gmail.com> wrote:
> Thanks for all the input.  It seems running wires to a new thermostat
> upstairs is the popular suggestion.   For now I've attached a $4 radio
> shack reed relay controlled by an arduino I have programmed for 20
> minutes of on time followed by 40 minutes of off time.  It seems to
> work very well as a home made timer.  I'm testing it out tonight.
>