I want to make a project roller. Once people go closer, the roller will rotate and generate paper roll. The shape of the box is inspired by 1st MacBook.

acrylic board

wood stick

2 powerful servo motors

1 circuit board

Arduino uno

1 ultrasonic distance sensor

Step 1: Make the File in Illustrator(AI)

I make my each side of my box in illustrator with careful measurement. Each line of board outline need to be default blue and 0.001 pt wide since I am going to laser cut them.

Step 2: Laser Cut

I used my school machine to laser cut my file in each piece and compose them with hot glue gun.

Step 3: Make Circuit and Code

I start to make circuit. This is the tinkercard version.

the code is like this:

const int trigPin = 9;
const int echoPin = 8; // defines variables long duration; int distance;

#include

Servo myservo1; // create servo object to control a servo Servo myservo2;

void setup() { myservo1.attach(11); myservo2.attach(10);

pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output pinMode(echoPin, INPUT); // Sets the echoPin as an Input Serial.begin(9600);

// myservo1.write(0);

}

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); // Reads the echoPin, returns the sound wave travel time in microseconds duration = pulseIn(echoPin, HIGH); // Calculating the distance distance= duration*0.034/2; // Prints the distance on the Serial Monitor Serial.print("Distance: "); Serial.println(distance);

if(distance<20){ myservo1.write(180); myservo2.write(180); }else if(distance>20){ myservo1.write(0); myservo2.write(0); } delay(15);

}