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NPN Proximity Sensor Arduino Board price and contaminants from electrical contactsAn NPN Proximity Sensor is a type of proximity sensor that operates based on the principle of detecting the presence of objects without any physical contact. It works by sensing changes in the electromagnetic field or by detecting other environmental changes such as capacitance or inductance. The sensor can detect objects made of various materials, including metal, plastic, or liquids, depending on the specific type. Key Features of an NPN Proximity