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Inexpensive incremental encoders are used in [[computer mouse#Mechanical mice|mechanical computer mice]]. Typically, two encoders are used: one to sense left-right motion and another to sense forward-backward motion.
===Rotary (Angle) Pulse Encoder===
[[File:Rotary Pulse Encoder Operation & Teardown.jpg|thumb|Rotary (Angle) Pulse Encoder Operation & Teardown]]
A Rotary (Angle) Pulse Encoder has a SPDT switch for each direction, with each one only operating in the direction of travel. Each turn indent in one direction causes the SPDT switch associated with that direction only to toggle.
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