Materials needed:

• Arduino Nano
• HC-SR04 ultrasonic sensor
• Breadboard
• Jumper wires
• USB cable
• Computer with Arduino IDE installed

Steps:

1. Connect the HC-SR04 ultrasonic sensor to the breadboard.
2. Connect the VCC pin of the HC-SR04 to the 5V pin on the Arduino Nano.
3. Connect the GND pin of the HC-SR04 to the GND pin on the Arduino Nano.
4. Connect the Trig pin of the HC-SR04 to the D10 pin on the Arduino Nano.
5. Connect the Echo pin of the HC-SR04 to the D11 pin on the Arduino Nano.
6. Connect the Arduino Nano to your computer using the USB cable.
7. Open the Arduino IDE on your computer.
8. Select the correct board and port in the Tools menu.
9. Create a new sketch by clicking on File -> New.
10. Copy and paste the following code into the new sketch:

Code

#define trigPin 10
#define echoPin 11

void setup() {
Serial.begin(9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
}

void loop() {
long duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration / 2) / 29.1;
Serial.print("Distance: ");
Serial.println(distance);
delay(500);
}

11. Verify and upload the code to the Arduino Nano by clicking on the Verify and Upload buttons in the Arduino IDE.
12. Open the Serial Monitor by clicking on Tools -> Serial Monitor.
13. The distance measurement in centimeters should now be displayed in the Serial Monitor.
14. Test the sensor by placing an object in front of it and observe the distance measurement on the Serial Monitor.