Question

How many pins are present in the Ultrasonic Sensor?

(a) 1

(b) 3

(c) 2

(d) 4

This question was posed to me in an interview for internship.

This intriguing question originated from Ultrasonic Sensor topic in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino

Answer 1

Correct answer is (d) 4

For explanation: The pins that are present on the Ultrasonic Sensor include, the Ground, the Vcc and the Signal pins. The role of the Ground and the Vcc is to power the sensor. The Vcc accepts a maximum voltage of approximately 5V. The signal pins; Trigger and Echo are present to detect the obstacle and convey the data from the sensor to the microcontroller or the microprocessor.