I decided to go for this 1200W, two setting, £5.00 hair dryer, from UK WalMart / Asda, to act as the air heater for the Gro-Bot it comes with a thermal cutout so it should cut out before melting. It’s going to be housed in the freezer compartment of the fridge so will not be affected by the humidity levels in the grow chamber.
Below you can just see the thermal cutouts in this close-up of the air intake of the dryer as well as the heater coils.
In the image below you can see the original cover for the fridge light and temperature control. The bit sticking out on the right is a switch for the light which is actuated when the door is opened and shut thus switching the light on and off.This will be connected as the door open/shut sensor.As you also see I have mounted a USB camera in the space which used to house the temperature control switch. It is a Playstation 3 USB camera costing £2.00 at the local games exchange shop. I have conected this to the version 2 software and it functions OK some of the parameters will need tweeking to get the best image though.