Things used in this project

Hardware components:
A000066 iso both
Arduino Arduino UNO & Genuino UNO
Can be any 5V Arduino board such as the mega
12002 04
Breadboard (generic)
11026 02
Jumper wires (generic)
09939 01
Rotary potentiometer (generic)
Omron b3f 1000 image 75px
SparkFun Pushbutton switch 12mm
09590 01
LED (generic)
Mfr 25fbf52 221r sml
Resistor 221 ohm
Panasonic eca1hm2r2
Capacitor 10 µF
Optional; you don't need it if you don't have it
Servo (generic)
I recommend micro servos as they draw less power
Software apps and online services:
Ide web
Arduino Arduino IDE
Hand tools and fabrication machines:
Hy gluegun
Hot glue gun (generic)


Schematics for External Power for the Servos


Servo Arm CodeArduino
There are comments explaining everything in the code, but it is pretty inefficient, I challenge you to make it more efficient!
//Code written by Ryan Chan; it is pretty inefficient, but gets the job done, I challenge you to make it more efficient!

//*IMPORTANT CHANGES IN VERSION 2: LEDs 4 and 5 have been moved to pins 7 and 8 respectively; Buttons 1 and 2 have been moved to pins 12 and 13 respectively. This is to make wiring easier.

#include <Servo.h>

Servo servo1; //Servos
Servo servo2;
Servo servo3;

const int LED1 = 2; //LEDs
const int LED2 = 3;
const int LED3 = 4;
const int LED4 = 7;
const int LED5 = 8;

const int button1 = 12; //Buttons
const int button2 = 13;

int button1Presses = 0; //Button values
boolean button2Pressed = false;

const int pot1 = A0; //Potentimeters
const int pot2 = A1; 
const int pot3 = A2;

int pot1Val; //Potentimeter values
int pot2Val;
int pot3Val;
int pot1Angle;
int pot2Angle;
int pot3Angle;

int servo1PosSaves[] = {1,1,1,1,1}; //position saves
int servo2PosSaves[] = {1,1,1,1,1};
int servo3PosSaves[] = {1,1,1,1,1};

void setup() {
  servo1.attach(5); // Set up everything and will run once; attach servos and define the pin modes
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);
  pinMode(LED5, OUTPUT);
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);


void loop() {
  // put your main code here, to run repeatedly: 
  pot1Val = analogRead(pot1); // This will read the values from the potentimeters and store it...
  pot1Angle = map(pot1Val, 0, 1023, 0, 179); // ... and this will map the values from the potentiometers to values the servos can use and store it for later use
  pot2Val = analogRead(pot2); 
  pot2Angle = map(pot2Val, 0, 1023, 0, 179);
  pot3Val = analogRead(pot3);
  pot3Angle = map(pot3Val, 0, 1023, 0, 179);
  servo1.write(pot1Angle); // These will make the servos move to the mapped angles
  if(digitalRead(button1) == HIGH){ // This will check how many times button1 is pressed and save the positions to an array depending on how many times it is pressed; switch/case works like a if statement
      case 1:
        servo1PosSaves[0] = pot1Angle;
        servo2PosSaves[0] = pot2Angle;
        servo3PosSaves[0] = pot3Angle;
        digitalWrite(LED1, HIGH);
        Serial.println("Pos 1 Saved");
      case 2:
         servo1PosSaves[1] = pot1Angle;
         servo2PosSaves[1] = pot2Angle;
         servo3PosSaves[1] = pot3Angle;
         digitalWrite(LED2, HIGH);
         Serial.println("Pos 2 Saved");
      case 3:
         servo1PosSaves[2] = pot1Angle;
         servo2PosSaves[2] = pot2Angle;
         servo3PosSaves[2] = pot3Angle;
         digitalWrite(LED3, HIGH);
         Serial.println("Pos 3 Saved");
       case 4:
         servo1PosSaves[3] = pot1Angle;
         servo2PosSaves[3] = pot2Angle;
         servo3PosSaves[3] = pot3Angle;
         digitalWrite(LED4, HIGH);
         Serial.println("Pos 4 Saved");
       case 5:
         servo1PosSaves[4] = pot1Angle;
         servo2PosSaves[4] = pot2Angle;
         servo3PosSaves[4] = pot3Angle;
         digitalWrite(LED5, HIGH);
         Serial.println("Pos 5 Saved");

  if(digitalRead(button2) == HIGH){ // Pretty self-explnatory here
    button2Pressed = true;   
  if(button2Pressed){ // if the boolean button2Press is true, then the servos will run though all their saved positions
    for(int i = 0; i < 5; i++){
        Serial.println(" potentimeter Angles: ");


Ryan Chan

I like turtles. I also like robots



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