The software measure our gas usage in the house is coming along slowly - I have attached a LDR to one of the Jeenodes and found out the light level when just the pilot light is on, and the light level when the burner is on.

so I can now detect the transitions when the boiler turns on and when it turns off, and from there calculate how long it was turned on for.

This all looks a bit strange at the moment :

(Click for larger)

The light sensor os on the right, attached with bluetac, the sensor on the left is a SHT11 temperature and humidity sensor.

The Jeenode is running a modified "Rooms" sketch - which will be documented later.