the series sensors will produce continuous on-off contact closures when in motion. When at rest, it will either settle in an open or closed state. It is sensitive to both tilt (static acceleration) and vibration (dynamic acceleration). The sensor can be easily used to produce a series of CMOS or TTL level logic pulses using a single resistor to limit current. This signal can be used to interrupt (wake up) a microcontroller or can be counted to estimate the amount and duration of activity. The sensor is fully passive, requires no signal conditioning, and can be easily used in a microcontroller interrupt circuit that draws 0.25uA of continuous current.