Stack Player – Automatic Stack Game Playing Machine

Introduction

Stack Player is a simple yet creative automation project that plays the popular Stack mobile game automatically using an Arduino and a servo motor.

The idea is straightforward:

The Stack game works on a single tap mechanism.If we automate the tapping action at the correct interval, the game can be played without human interaction.

What started as a small servo experiment evolved into a product-style hardware build — complete with a custom-designed enclosure manufactured using professional 3D printing services like JUSTWAY.

This project demonstrates:

• Servo motor control
• Timing-based automation
• Mechanical design integration
• Product-level presentation thinking

Supplies

Electronics

• Arduino (Uno / Nano)
• SG90 Servo Motor
• Stylus / Capacitive Pen
• Jumper wires
• USB cable

Mechanical

• Custom 3D printed enclosure
• Servo mounting bracket
• Screws / Adhesive
• Tablet or Mobile device

Step 1: Understanding the Working Principle

The Stack game requires one tap to drop each block.

To automate this:

• The servo rotates downward (tap position).
• The stylus touches the screen.
• The servo returns to its original position.
• The process repeats continuously.

Two key angles are used:

• 125° → Stylus Up
• 90° → Tap Position

By controlling delay timing, we control stacking rhythm.

Step 2: Circuit Connections

• Servo Red → 5V
• Servo Brown/Black → GND
• Servo Orange → Digital Pin 3
• Connect Arduino via USB

Ensure stable power for smooth servo operation.

Step 3: Upload the Code

#include <Servo.h>

Servo servo1;

void setup()
{
  servo1.attach(3);
  servo1.write(125);
  delay(5000);
  servo1.write(90);
  delay(200);
  servo1.write(125);
  delay(750);
}

void loop()
{
  servo1.write(90);
  delay(200);
  servo1.write(125);
  delay(600);
}

Code Explanation

• servo1.attach(3); → Connect servo to pin 3
• servo1.write(90); → Tap screen
• servo1.write(125); → Release tap
• delay() → Controls tap duration and speed

Adjust delays to improve stacking performance.

Step 4: Mechanical Setup

• Fix servo securely near the screen
• Attach stylus to servo arm
• Align stylus tip with tapping zone
• Ensure light but consistent contact

Stability is critical. Even small vibrations affect accuracy.

Step 5: From Prototype to Product – Designing the Cloud Enclosure

A bare PCB with exposed wires works perfectly for testing.

But when you want to:

• Present at exhibitions
• Showcase at demo days
• Build a portfolio project
• Make your hardware look product-ready

Presentation becomes critical.

So instead of leaving it as an open circuit, I designed a custom cloud-shaped enclosure.

Design Goals

• Perfect display alignment
• Hidden internal wiring
• Secure mounting structure
• Smooth, rounded aesthetic
• Desk-friendly compact size

The objective was simple:Transform a working prototype into a product-grade build.

Step 7: Professional Manufacturing with JUSTWAY

To achieve a clean and refined finish, the enclosure can be manufactured using professional services like JUSTWAY.

JUSTWAY provides:

• Rapid prototyping
• High-detail resin 3D printing
• Nylon printing for durability
• CNC machining for metal parts
• Injection molding for scaling production
• Urethane casting for small batches

For projects like Stack Player, professional fabrication ensures:

• Better surface finish
• Accurate tolerances
• Stronger structure
• Clean, premium appearance

These services don’t change how your circuit works —they change how your project is perceived.

And in hardware design, perception matters.

A clean enclosure builds:

• Credibility
• Confidence
• Professional appeal

Learning Outcomes

Through this project, you learn

• Servo motor control
• Arduino programming
• Timing optimization
• Mechanical alignment
• CAD design fundamentals
• Product prototyping workflow

Conclusion

Stack Player started as a simple servo experiment.

But by integrating mechanical design and professional manufacturing, it evolved into something that feels intentional and product-ready.

Great hardware is not just about electronics.It is about engineering + design + presentation.

And when those elements combine —even a simple Arduino project can look startup-ready.