A contact sensor is a device that detects objects, obstructions, or barriers by means of direct physical contact. Contact sensors can also be used to measure applied force or torque. In robotics, such devices include “whiskers” and pressure sensors.

Simplicity is the main asset of contact sensing when used to determine the presence or absence of an object. In order to measure force or torque accurately, especially when such force or torque must be regulated, a closed-loop system is required.

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