Timeline and Details

Recognition: Featured at PBZ Novathon, Zagreb

Overview

IoT-enabled piggy bank that auto-locks until savings goal is reached. Combines multiple microcontrollers and wireless communication for interactive financial education.

Technical Implementation

Hardware Components:

• 3x Micro:bit (parent controller + 2 child nodes)
• Arduino (lock control logic)
• 5V relay + 12V electronic lock
• Laser-cut enclosure (Solid Edge CAD, CNC machined)

Software Architecture:

• Parent Micro:bit: Main controller with radio communication, savings tracking, mode switching
• Child Micro:bit 1: Visual feedback (eye display based on progress)
• Child Micro:bit 2: Serial communication bridge to Arduino (9600 baud)
• Arduino: Lock control logic (releases when goal reached)

Communication:

• Radio mesh network (Micro:bit to Micro:bit)
• Serial UART (Micro:bit to Arduino)

Features

• Goal-based auto-lock mechanism
• Manual coin value input via Micro:bit buttons
• Shake-to-activate deposit mode
• Visual progress tracking on LED matrix
• Emotional feedback (displays sad face if inactive 4+ days)
• Emergency unlock override

Tech Stack

Hardware: Micro:bit, Arduino, relay, servo lock
CAD/Manufacturing: Solid Edge, CNC laser cutter
Programming: MicroPython, Arduino C/C++
Communication: Radio mesh (2.4GHz), serial UART

Skills

Embedded systems, multi-microcontroller architecture, wireless communication protocols, CAD design, CNC fabrication, hardware prototyping