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40d:Repeater
A repeater is a device which creates a never-ending cyclic on/off signal. Several designs are possible, and they can be made to operate at varying rates. They (usually) use fluid or creatures to trigger pressure plates to create a cycle, continually trigger the plates, which can then also be linked to trigger external systems.
Fluid uses the natural flow and varying depths to trigger plates. Creatures use pathing, opening and closing doors to attract the creature to step on the plates.
One example fluid logic repeater (described on the forum by AncientEnemy) is as follows:
≈≈≈≈≈ - river or brook ═╗≈╔═ - wall to channel out after construction ╠╬╣ - fortification (to filter out any creatures inhabiting your river) ╠X╣ - shutoff floodgate (linked to convenient lever) ║#║ - 1-tile raising bridge (linked to pressure plate) ║^┼ - pressure plate (set to 7-7 water) and access door ╠X╣ - floodgate (linked to pressure plate) ╚═╝
This repeater toggles fairly slowly, about once every 300 steps, making it suitable for operating bridges, floodgates, and upright spikes. As an added bonus, the bottom wall (immediately beyond the floodgate) can be removed and connected to a cistern whose water level will be automatically maintained at a level between 3 and 4 deep.