Re: Remote temp sensing help??

From: Rodney Josey (rjosDIESPAM_at_dodo.com.au)
Date: 01/10/05 

Date: Mon, 10 Jan 2005 20:13:03 +1000

On Sun, 09 Jan 2005 13:26:41 -0700, Jenny3kids@msn.net wrote:

>Hi people,
>
>I live on a small acreage and I have two wells and two pump rooms on
>the property. Winter temps frequently get below freezing so I have to
>keep a small heater in them to prevent pipes freezing overnight.
>
>Currently I use some cheap indoor/outdoor thermometers to monitor the
>temp inside the insulated enclosures but I have to walk to each one to
>check it.
>
>I need some temp senders so I can have a remote station in the house
>and each one can constantly indicate the inside temp so if the heater
>dies I can get down there and fix it. I can have a switch to cycle
>through them manually I do not need a 4-station setup but that would
>be a nice luxury, cost permitting.
>
>There is 110v in all places so batteries are not an issue. Can anyone
>suggest a CHEAP kit I can get? The farthest away sender would be about
>800 feet.
>
>Thanks in advance.

Hi Jenny,

Here in OZ back in July 2003 (would you believe it is now Jan 2005) - our local electronics magazine
- SILICON CHIP - featured an article on using an PICAXE chip for communications purposes AND even
had a small section referring to 'wireless' linking using prebuilt hybrid 433MHZ UHF radio modules
at each end - reasonably cheap & developed for licence-free radio links. Now with a simple
directional RF antenna it is suggested that such links could reach up to a few kilometers.

If you think this type of circuit arrangement may be useful, you might want to look at getting a kit
from one of our local suppliers - www.oatleyelectronics.com - they can supply both the RF modules as
well as the Picaxe chips - if you need any additional 'interface' circuitry then let me know and
I'll see what I can draw up for you.

Oz-Rod

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