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duplo-train 🚂

I decided to post an old project (from 2009) of mine which I made for my kids (and of cause to learn :).

The project is a PCB prototype for a LEGO DUPLO train which uses a 8-bit ATtiny85 microcontroller (still available!) to control the motor, buttons, sensor and produce different train sounds.

The idea was to change the sound to sound a bit more like a steam train than a more modern diesel train. Why? Because it could be done :)

Features

  • Starts and stops slowly as an old steam train 🚂
  • Have realistic sounds (sound from a real steam train) when the train starts and stops 🔉
  • When the train is running there is a sound from a bell and horn (again real steam train sounds) 📣
  • When the train is fuelled via the button the horn is heard
  • The motor stops if it hits e.g. a wall 💥
  • If the train has not been used within 5 seconds it goes into a power save mode 💤

Software

The code was written in Atmed Studio but also compiles with the older CrossPack on Mac OS X.

Schematics

PCB prototype

Happy hacking! :)