A Pocket Money Vending Machine for Kids
summary
A DIY pocket-money dispenser that takes a smart card, checks a PIN, and mechanically dispenses one coin at a time using a servomotor driving a crank (bielle‑manivelle). Electronics are built around an Arduino Nano with an LCD, matrix keypad and an I2C expander to save pins, plus a custom PCB replacing breadboards; enclosure and mechanism parts are 3D printed. The project required about two months of iterative design and prototyping and results in a reliable coin dispenser.
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chapters (11)
- 0:00Piggy bank idea
- 1:27Coin dispensing design
- 3:513D-printed coin parts
- 5:33Smart pocket money card
- 6:36Kids' screen and keypad
- 7:37Arduino Nano I/O
- 8:39Breadboard prototyping
- 10:03Electronic motherboard
- 11:48DIY PCB etching
- 12:493D-printed case
- 13:53Final demo
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