MiniBank: Smart Saving for Kids
This project explores a smart mini bank system that goes beyond traditional saving to teach children how to save with purpose. 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.
Inspired by how children learn arithmetic through everyday actions like adding coins or calculating change, this concept introduces structured, goal-based saving through interaction. The piggy bank functions as a mini banking system, internally organizing deposited coins to make savings visible and purposeful.
I am currently working with two conceptual approaches. The first is a goal-based model where a child sets a specific savings target and receives weekly guidance on how much to save. The second draws from the simplified 50–30–20 principle, where only a portion of the saved amount is accessible, encouraging discipline and delayed gratification. By combining saving with intention and planning, the piggy bank becomes an active learning tool rather than a passive container.
Concept & Rationale
Children are often told to save money, but rarely taught how to save wisely. Many accumulate coins without a clear purpose, leading to impulsive spending once the money is accessed. This pattern often continues into adulthood. I observed similar contrasts among colleagues on the same payroll—some struggled before month-end, while others managed comfortably. This raised a key question: why does saving feel intuitive for some, but not for others?
This reflection led to the idea of teaching children not just to save, but to save with intention.
The Smart Mini 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.
Through this process, the child learns:
- Restraint and patience
- Delayed gratification
- Foundational financial awareness
- An understanding of planning over impulsive spending
To reinforce positive saving behavior, the Smart Mini Bank rewards the child upon successful completion of a goal by adding a small amount of interest to the saved total, introducing simplified real-world financial principles in an age-appropriate manner. Parents act as facilitators rather than enforcers, guiding reflection and discussion instead of merely controlling access to money.
At its core, this project reimagines the traditional piggy bank as a Smart Mini Bank, an interactive system that encourages purposeful saving and helps children develop a healthy, intentional relationship with money from an early age.
Initial concept model on SketchUp
Preliminary Diameter and Material Study for Coin Identification System Design
Since my final project involves designing a coin identification system that detects denomination and updates a running total, it was necessary to analyze whether Indian coin denominations are dimensionally consistent across different series. Accurate value computation depends on reliable physical identification; therefore, I first examined variations in diameter and material among commonly circulated coins.
Comparison across models
₹1 Coin Series Comparison
| Series | Diameter | Material | Type |
|---|---|---|---|
| 1988 Stainless Series | 25 mm | Stainless Steel | Single |
| 2004 Unity | 25 mm | Stainless Steel | Single |
| 2007 Hasta Mudra | 25 mm | Stainless Steel | Single |
| 2011 Rupee Symbol | 21.93 mm | Stainless Steel | Single |
| 2019 Grain Series | 20 mm | Stainless Steel | Single |
₹2 Coin Series Comparison
| Series | Diameter | Material | Type |
|---|---|---|---|
| 1988 Series | 26 mm | Copper-Nickel | Single |
| 2004 Unity | 26.75 mm | Stainless Steel | Single |
| 2007 Hasta Mudra | 27 mm | Stainless Steel | Single |
| 2011 Rupee Symbol | 25 mm | Stainless Steel | Single |
| 2019 Grain Series | 23 mm | Stainless Steel | Single |
₹5 Coin Series Comparison
| Series | Diameter | Material | Type |
|---|---|---|---|
| 1988 Series | 23 mm | Copper-Nickel | Single |
| 2004 Unity | 23 mm | Stainless Steel | Single |
| 2007 Common (Steel) | 23 mm | Stainless Steel | Single |
| 2007 Common (Nickel-Brass) | 23 mm | Nickel-Brass | Single |
| 2011 Rupee Symbol | 23 mm | Nickel-Brass | Single |
| 2019 Grain Series | 25 mm | Nickel-Brass | Single |
₹10 Coin Series Comparison
| Series | Diameter | Material | Type |
|---|---|---|---|
| 2004 Unity | 27 mm |
Center: Copper-Nickel Ring: Aluminium-Bronze |
Bimetallic |
| 2007 Common | 27 mm |
Center: Copper-Nickel Ring: Aluminium-Bronze |
Bimetallic |
| 2011 Rupee Symbol | 27 mm |
Center: Copper-Nickel Ring: Aluminium-Bronze |
Bimetallic |
| 2019 Grain Series | 27 mm |
Center: Copper-Nickel Ring: Aluminium-Bronze |
Bimetallic |
₹20 Coin Series Comparison
| Series | Diameter | Material | Type |
|---|---|---|---|
| 2019 Grain Series | 27 mm |
Center: Nickel-Brass Ring: Nickel Silver |
Bimetallic |
Final Comparison Summary
| Denomination | No. of Varieties | Diameter Range | Materials Used |
|---|---|---|---|
| ₹1 | 5 | 20–25 mm | Stainless Steel |
| ₹2 | 5 | 23–27 mm | Copper-Nickel, Stainless Steel |
| ₹5 | 6 | 23–25 mm | Copper-Nickel, Stainless Steel, Nickel-Brass |
| ₹10 | 4 | 27 mm | Bimetallic (Cu-Ni + Al-Bronze) |
| ₹20 | 1 | 27 mm | Bimetallic (Ni-Brass + Ni-Silver) |
Design Implications for the Identification System
Overall, this study defines the diameter ranges and material variations that must be considered while designing the coin identification mechanism.
Materials
| Qty | Description | Price | Link |
|---|---|---|---|
| Material one | 22.00 $ | https://amazon.com/testoe | Order many |
| Material two | 22.00 $ | https://amazon.com/testoe | |
| Material three | 22.00 $ | https://amazon.com/testoe | |
| Material four | 22.00 $ | https://amazon.com/testoe |