I now have set up a Arduino in the garage with 2 temperature sensors available through Ethernet.

- SHT series which senses both temperature and humidity

- DS1820 digital (onewire) temperature sensor

They are available from the link below - and via a PHP script on our main webserver the webserver on the Arduino is queried - and the extra processing is done in the PHP script.

The output looks like this :

URL: http://192.168.0.177/
Temperature: 10.0
Humidity: 69 %
Temperature sensor 2: 8.87

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The 2 sensors are approximately 3 feet apart, and will have different temperatures.

The SHT series is soldered on to a Arduino shield (from nuelectronics) and it turned out this one gave a reading that was approximately 2 - 4 degrees wrong (due to the heat from the Arduino power supply etc) until i pointed a fan I had towards it. It is now quite accurate.

I will release the code to anyone that wants it - and on the website as soon as I can document it a bit more.