I’ve started to build a prototype for testing purposes with a temperature sensor.
The temperature is measured and posted to a webservice once a Minute, 24 hours a day. In this diagram you can see the temperature in my living room:
To keep it a bit more interesting I’ve put the sensor close between the heater and a window to get higher and faster temperature changes due to Radiation (a simple red line would be boring ;-) )
The setup is very simple and total price is < 5 $ per device!