A. Proximity sensor प्रॉक्सिमिटी सेंसर
B. Humidity sensor ह्यूमिडिटी सेंसर
C. Touch sensor टच सेंसर
D. Pressure sensor प्रेशर सेंसर
A proximity sensor is a device that can detect or sense the approach or presence of nearby objects and for this it does not need physical contact.