Build Instructions

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• 1

  Setting Up Code

  Copy this Code into Arduino:

  const int trigPin = 12;
  const int echoPin = 13;
  const int ledPin = 16;

  int minDistance = 10;  // Minimum distance for LED on (cm)
  int maxDistance = 30;
  
  
  //define sound velocity in cm/uS
  #define SOUND_VELOCITY 0.034
  #define CM_TO_INCH 0.393701
  
  long duration;
  float distanceCm;
  float distanceInch;
  
  void setup() {
    Serial.begin(115200); // Starts the serial communication
    pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
    pinMode(echoPin, INPUT); // Sets the echoPin as an Input
    pinMode(ledPin, OUTPUT);
  }
  
  void loop() {
    // Clears the trigPin
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2);
    // Sets the trigPin on HIGH state for 10 micro seconds
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin, LOW);
  
    int distance;
  
  
  
      // Reads the echoPin, returns the sound wave travel time in microseconds
    duration = pulseIn(echoPin, HIGH);
      // Calculate the distance
    distanceCm = duration * SOUND_VELOCITY/2;
      // Convert to inches
    distanceInch = distanceCm * CM_TO_INCH;
      // Prints the distance on the Serial Monitor
    Serial.print("Distance (cm): ");
    Serial.println(distanceCm);
    Serial.print("Distance (inch): ");
    Serial.println(distanceInch);
    distance = duration * 0.034 / 2;
      if (distanceCm >= minDistance && distanceCm <= maxDistance) {
      digitalWrite(ledPin, HIGH); // Turn LED on
    } else {
      digitalWrite(ledPin, LOW);  // Turn LED off
    }
  
    delay(1000);
  }

• 2

  Create box to put machine in

  Download this file and 3D print it

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