Homebrew: A green spin on the tumble dryer

For his entry into ZDNet.co.uk's Homebrew Challenge, Gren Mercer from Weymouth, Dorset, has built a prototype of an energy-saving device for tumble drying. The sensor switches the machine off when the clothes are dry. While expensive dryers have this feature, cheaper ones do not. Gren claims the device should help people who can afford only the c...