A novel, adaptable and inexpensive computerized activity meter.

A number of activity meters ranging from fully manual to fully automated have been described. A computerized activity meter, used primarily as a rotational activity chamber, is described. This inexpensive system is built around a Commodore 64 computer interfaced through a circuit board to the meters. Each computer can run four chambers and, as a rotometer, can distinguish quarter and full turns in either direction. The system is easily adapted to record data from various behavioral chambers, including an open field with photocell beams.