Out of sheer curiosity I decided to measure the temperature and humidity levels in the air being expelled from our tumbledryer.

So this little one was born :

(Click for larger)

I's a Jeeduino mounted on top of a batterypack (with 3 * AA batteries) and a SHT11 sensor on a set of wires to allow me to insert it into the exhaust tube. In the end I decided to put the whole assembly inside the tube, where it wirelessly sends its measurements into the rest of the house automation system