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To pick up a fragile egg without crushing it, a robot hand needs to sense how hard it is gripping.
Tactile sensors give robots something like a sense of touch, detecting force, pressure, and even texture at the point of contact so a robotic hand can judge exactly how hard it's squeezing and adjust its grip in real time, essential for handling something as delicate as an egg without either dropping or crushing it.
Smoke detectors sense airborne particles from fire and compasses sense magnetic direction, neither measures force or contact pressure, so neither could tell a robot anything about how firmly it's gripping an object.
This kind of "electronic skin" research is one of the trickiest problems in robotics, since human fingertips pack an astonishing density of touch receptors, and replicating even a fraction of that sensitivity is a major reason today's humanoid robot hands still struggle with fine dexterity.
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