Moteiv Corp., San Francisco, CA, offers its Tmote Invent wireless sensor system that lets you build and install custom wireless sensor applications more easily and cheaply. The system combines in one case the company's Tmote Sky sensor module for communication and computation, a rechargeable battery, an integrated suite of sensors, a microphone, and a speaker. Software uses the company's distribution of TinyOS. Common sensors include those for light, temperature, sound, and acceleration.
