3d print these 3d models using Onshape:https://osd.onshape.com/documents/bce763c140e0d1f4b60caca3/w/d3b92d8cee05361d7e29aa4c/e/132df27706402643b5f49f92

Plug in arduino to a windows computer via usb for coding in C++

Plug potentiometer and servo into Arduino(Servo:Gnd to black, 5v to red, ~3 to yellow) (Pot: Gnd to rightermost pin, A3 to middle pin, 3v to leftmost pin) using breadboard wires.

1. Download our code in c++: 
2.  #include <Servo.h>
3. Servo myServo;
4. int potPin = A4;
5. int potValue = 0;
6. void setup() {
7.   myServo.attach(3);
8.   pinMode(potPin, INPUT);
9.   myServo.write(0);
10.   Serial.begin(9600);
11. }
12. void loop() {
13.  
14.   potValue = analogRead(A4);
15.   Serial.println(potValue);
16.   if((potValue < 679) && (potValue > 452)){
17.     myServo.write(180);
18.   }
19.   else if((potValue < 452) && (potValue > 225)){
20.     myServo.writeMicroseconds(1500);
21.   }
22.   else if((potValue < 225) && (potValue > 0)){
23.     myServo.write(-180);
24.   }
25. }

Glue gears to servo

Glue the two 3d printed parts together

Apply (tape) spectrum to the 3d printed parts

Slide the back end of the servo onto the bracket

Slide bracket onto the lip of the spectrum