HC-SR04 Ultrasonic sensor

What type of signals does a HC-SR04 sensor use?

• ultrasonic waves

• microwave

• digital

• radio waves

What HC-SR04 pin is used to transmit signals?

• VCC

• GND

• Trig

• Echo

What pin is used to receive signals?

• VCC

• GND

• Trig

• Echo

What command is used to turn ON the HC-SR04 sensor?

• digitalWrite(trigPin, HIGH);

• analogWrite(trigPin, HIGH);

• digitalWrite(trigPin, LOW);

• analogWrite(trigPin, LOW);

What is the formula to compute for the duration of time travelled by the signal from the sensor to the object?

• distance = time * .034 / 2

• time = distance/ .034

• distance = speed * .034 /2

• time = 0.034 /distance

What is the command to initialize echoPin in void setup?

• pinMode(echoPin,INPUT);

• pinMode(echoPin,OUTPUT);

• const int echoPin;

• long echoPin;

In what pin do we connect VCC?

• GND

• 5V

• Digital pin

• Analog pin

What is the command to receive the signal from the HC-SR04 sensor?

• analogRead

• digitalRead

• pulseIn

• pulseOn

Where do we connect the trigPin?

• Digital pin

• Analog pin

• 5V

• GND

In what pin should we connect the echoPin?

• GND

• 5V

• digital pin

• analog pin