Motorized Zaku Head

This is a motorized Zaku head with LED mono-eye inspired by Zaku II from Mobile Suit Gundam.  The idea for this project was inspired by the YouTube channel つとむニキ / TsutomuNiki(www.youtube.com/@TsutomuNiki), whose builds gave me the motivation to try making my own motorized version.  The head rotates using a small servo motor, and the mono-eye lights up with an LED for a cool display effect. It’s a fun mix of 3D printing and beginner-friendly electronics, and makes a great desk or shelf display.  The model is designed to be easy to print and assemble with basic hobby electronics. If you build one, I’d love to see your makes—feel free to share photos or suggestions for improvements! 

Servo motor (SG90):

• Red → 5V
• Brown/Black → GND
• Yellow/Orange (signal) → Pin 9

Button 1 (Move Forward)

• One side → Pin 2
• Other side → GND

Button 2 (Move Backward)

• One side → Pin 3
• Other side → GND

Arduino Code:

#include <Servo.h>

Servo myServo;

const int servoPin = 9;
const int btnForward = 2;
const int btnBackward = 3;

int angle = 90;   // Start at middle position

void setup() {
 myServo.attach(servoPin);

 pinMode(btnForward, INPUT_PULLUP);
 pinMode(btnBackward, INPUT_PULLUP);

 myServo.write(angle);
}

void loop() {
 if (digitalRead(btnForward) == LOW) {   // Button pressed
   angle += 2;                            // Move forward
 }

 if (digitalRead(btnBackward) == LOW) {  // Button pressed
   angle -= 2;                            // Move backward
 }

 angle = constrain(angle, 0, 180);        // Keep safe range
 myServo.write(angle);

 delay(20);  // Speed control (smaller = faster movement)
}