HC-SR04 Sensor and Arduino Basics

This tutorial by Dejan Nedelkovski from HowToMechatronics.com explains how to use the HC-SR04 Ultrasonic Sensor to measure distances. The sensor can measure from 2 cm to 4 meters with an accuracy of 3 mm. It works by emitting ultrasound at 40,000 Hz, which bounces back upon hitting an object. The tutorial covers connecting the sensor to an Arduino board, generating ultrasound, and calculating distance using the travel time of the sound wave. It also provides example code for implementing the sensor with Arduino, and concludes with additional resources for further learning.

What is the maximum distance the HC-SR04 sensor can measure?

• 4 meters

• 2 meters

• 8 meters

• 6 meters

What is the frequency of the ultrasound emitted by the HC-SR04 sensor?

• 40,000 Hz

• 50,000 Hz

• 30,000 Hz

• 20,000 Hz

Which pin on the HC-SR04 is used to trigger the ultrasound wave?

• VCC

• Trig

• Ground

• Echo

Which pins on the HC-SR04 need to be connected to the Arduino's Ground and 5V?

• Trig and Echo

• Ground and VCC

• Echo and VCC

• Trig and Ground

How long should the Trig pin be set to HIGH to generate an ultrasound wave?

• 20 microseconds

• 15 microseconds

• 10 microseconds

• 5 microseconds

What does the Echo pin output?

• Time in microseconds

• Frequency in Hz

• Distance in centimeters

• Voltage in volts

What function is used in Arduino to read the travel time of the sound wave?

• pulseIn()

• delay()

• digitalRead()

• analogRead()

In the Arduino code, what type of variable is used to store the travel time?

• float

• long

• char

• int

What is the formula to calculate the distance using the travel time from the Echo pin?

• Multiply by 0.068 and divide by 4

• Multiply by 0.034 and divide by 4

• Multiply by 0.068 and divide by 2

• Multiply by 0.034 and divide by 2

Where can you find additional resources and example codes for the HC-SR04 sensor?

• In the video description

• In the Arduino library

• In the sensor's manual

• In the Arduino IDE