A generator/sensor may include a pair of arcuate swing arms having
respective opposing ends pivotally carried by a base so that the arcuate
swing arms are transverse to one another and define a movable crossing
point therebetween. A body may be carried by the arcuate swing arms at
the crossing point therebetween. At least one electrical generator may be
driven by relative movement between the body and the base, such as to
generate electrical power or to sense movement, for example. The body may
be a pendulum mass or sail responsive to fluid flow.