The development of pillbox-size computers called motes that combine microprocessors and memory with radio transceivers, onboard power supplies and a variety of sensors is discussed. Motes are inexpensive enough to deploy by the thousands in factories, farms or wilderness. Each mote can collect and analyze sensor readings independently and also link up with neighbouring motes in a meshlike perceptive network. Motes are already being manufactured by Crossbow, Intel and other companies.