HC-SR04 Sensor Quiz

What does the Echo pin on the HC-SR04 do?

• Receive ultrasonic bursts

• Transmit ultrasonic bursts

• Start the ultrasonic burst

• Measure time between bursts

What voltage should the Trig pulse be set to?

• 5V

• 3.3V

• 2V

• 1V

What objects can interfere with ultrasonic sensor accuracy?

• Clear objects

• Shiny surfaces

• Small objects

• Irregular shapes

How is the distance calculated by the HC-SR04 sensor?

• By measuring the amplitude of the return signal

• By measuring frequency shift

• By measuring the time between sending and receiving the ultrasonic burst

• By counting the number of wavelengths

What does the Trig pin on the HC-SR04 do?

• Receive ultrasonic bursts

• Transmit ultrasonic bursts

• Stop the ultrasonic burst

• Calculate time between bursts

What components does the HC-SR04 sensor contain?

• Speaker and microphone

• LED and photoresistor

• Ultrasonic transmitter and receiver

• Resistor and capacitor

What does the HC-SR04 sensor allow you to calculate?

• Temperature

• Distance

• Speed

• Light intensity

How long should you wait after setting Trig high before reading the Echo pin?

• 10 μs

• 50 μs

• 100 μs

• 500 μs

What is one useful real-world application of ultrasonic distance sensors like the HC-SR04?

• Automatic light switches

• 3D motion control

• Smartphone drop detection

• Parking sensor in cars

What is the best way to detect transparent and irregular objects?

• Increase detections per second

• Use multiple sensors

• Reflect signal off the background

• Decrease sensor angle