Build Instructions

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• 1

  Setting Up Code

  Copy this Code into Arduino:

  // constants won't change
  const int TRIG_PIN = 14;  // Arduino pin connected to Ultrasonic Sensor's TRIG pin
  const int ECHO_PIN = 13;  // Arduino pin connected to Ultrasonic Sensor's ECHO pin
  const int LED_PIN  = 16;  // Arduino pin connected to LED's pin
  const int BUZZER_PIN = 2; const int MIN_DISTANCE = 10;  // Minimum distance for LED on (cm)
  const int MAX_DISTANCE = 50;  // Maximum distance for LED on (cm)

  long duration;
  float duration_us, distance_cm;

  void setup() {
    Serial.begin(9600);  // Initialize serial port
    pinMode(TRIG_PIN, OUTPUT);  // Set TRIG_PIN as output
    pinMode(ECHO_PIN, INPUT);   // Set ECHO_PIN as input
    pinMode(LED_PIN, OUTPUT);   // Set LED_PIN as output
    pinMode(BUZZER_PIN, OUTPUT); // Set BUZZER_PIN as output
  }

  void loop() {
    // Send a 10-microsecond pulse to TRIG pin to start the measurement
    digitalWrite(TRIG_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN, LOW);

    // Measure the duration of the pulse received by ECHO pin
    duration_us = pulseIn(ECHO_PIN, HIGH);

    // Calculate the distance in cm (speed of sound is 0.034 cm/us)
    distance_cm = (duration_us * 0.034) / 2; // Divide by 2 because pulse travels to object and back

    // Check if the distance is within the defined range
    if (distance_cm >= MIN_DISTANCE && distance_cm <= MAX_DISTANCE) {
      digitalWrite(LED_PIN, HIGH);      // Turn on LED
      tone(BUZZER_PIN, 1000);           // Generate tone (1 kHz frequency for active buzzer)
    } else {
      digitalWrite(LED_PIN, LOW);       // Turn off LED
      noTone(BUZZER_PIN);               // Stop buzzer sound
    }

    // Print the distance to Serial Monitor
    Serial.print("Distance: ");
    Serial.print(distance_cm);
    Serial.println(" cm");

    delay(500);  // Wait for 500 ms before taking another measurement
  }

• 2

  Create box to put machine in

  Download this file and 3D print it

• 3

  Follow this tutorial to put all the parts together

  https://www.youtube.com/watch?v=HynLoCtUVtU

View all 4 instructions