🐷
Final Project

Penny Pal

A goal-based savings companion for kids

🎓 Penny Pal - Final Presentation Slide


🎓 Penny Pal - Final Presentation Video


✏️ Initial Ideas & Sketches

week 1. Principles and Practices, Project management
Smart Piggy Bank Concept Internal Mechanism View

Early explorations ranged from a goal-based savings box to a multisensory piggy bank experience.

A Smart Piggy Bank that teaches children how to save with purpose, not just store money.

This project explores a Smart Piggy Bank System that goes beyond traditional saving. While conventional piggy banks and school-led saving schemes encourage putting money aside, they rarely guide children on how to save strategically toward a goal. This project seeks to bridge that gap.

Designing for the Senses

The more senses involved in an action, the more intuitive it feels, the more it holds attention, and the more it is remembered. A single tap on a screen engages almost nothing. But dropping a coin into a slot, feeling its weight, hearing it fall, pressing a button, watching a light change, and hearing a voice respond creates multiple sensory moments from one small action.

Penny Pal is deliberately designed around this idea. Every coin deposit is intended to be a multisensory experience.

The Penny Pal Piggy Bank introduces goal-oriented saving, where a child sets a specific target (with parental guidance) and works toward it through consistent contributions and delayed access to funds. Saving becomes a structured and intentional process rather than simple accumulation.


🐷 Exploring the Form in Blender

week 2. Computer Aided design

Example
🐷 Final Form in Fusion 360

week 20. Project Development


Behind the Build

From early sketches and design decisions to system integration and the finished product, explore the complete journey of Penny Pal.

Preliminary Design Development

Preliminary Design Development Archive

Initial ideas, iterations, discarded concepts, and design decisions.

System Integration

System Integration

User flow diagrams, conceptual mockups, and proof of concept.

Applications and Implications

Applications & Implications

Inspirations, references, future possibilities, and planned applications.

Final Project Development

Final Project Development

Design progression, electronics integration, prototyping, and iterative development.



Project Highlights

🏗️ Building the System Skeleton


week 16: System Integration

🔩 Final Product Packaging

week 16: System Integration
📱 Mobile App and Cloud Connectivity

week 15: Interface and Application Programming

Bill of Materials (BOM)

No. Component Qty. Description Price (₹) Price (US$) Link Source
1 XIAO ESP32-C6 1 Main controller with built-in Wi-Fi ₹677 $7.87 View Fab Inventory
2 IR Sensor Module 1 Object/Coin detection ₹25 $0.29 View Fab Inventory
3 Tactile Push Buttons 4 Coin denomination buttons ₹52 $0.60 View Fab Inventory
4 NeoPixel LED Strip 1 Progress tracking and visual feedback ₹490 $5.70 View Fab Inventory
5 JQ6500 MP3 Module 1 Audio playback ₹190 $2.21 View Fab Inventory
6 0.5W 8Ω Speaker 1 Audio output ₹28 $0.33 View Fab Inventory
7 Micro Solenoid 2 Coin locking mechanism ₹499 $5.80 View Purchased
8 Decoupling Capacitors 2 Power stability View Fab Inventory
9 JST Connectors As required Module connections View Fab Inventory
10 Li-ion Battery 1 Rechargeable power source ₹107 $1.24 View Fab Inventory
11 Boost Converter 1 Voltage regulation View Fab Inventory
12 PLA Filament 1 3D printed enclosure and support structures View Fab Inventory
13 Acrylic Sheet 1 Laser-cut components View Fab Inventory
14 FR1 PCB Material 1 PCB fabrication View Fab Inventory

*USD prices are approximate, calculated using an exchange rate of ₹86 ≈ US$1. Prices are provided for reference only.



Design Files

  • Penny Pal Fusion File
  • 3D Print Files
  • Laser Cut Files
  • PCB Files

  • Main PCB KiCad Design Files
  • Main PCB Gerber Files
  • Breakout Board KiCad Design Files
  • Breakout PCB Gerber Files
  • Program Files

  • Penny Pal Program
  • Other Files

  • MP3 Files
  • Notion File with All Test Codes