Build your own Harry Potter's Remembrall

One of most useless magic gadgets in Harry Potter saga. To be more precise Harry Potter never had a Remembrall, but his friend Neville Longbottom received that magic item from his grandmother.

Recently I’ve found an online project explaining how to build a Remembrall by yourself, exploiting a small Calliope device. But the description of the project was not complete, and the circuit appeared to not work similarly to the true Remembrall magic artifact.

Then I decided to build one by myself, but changing the main platform. I investigated for the first time the ATtiny85 microcontroller, and I found it perfect for the purpose of present project.

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