You can build a working combination dial safe using the Circuit Playground Express, a servo motor, a box, and a few magnets, wires, and batteries!

The Circuit Playground Express has everything we'll need to act as a dial that measures rotation, can give feedback through colored lights and sounds, and even control the lock!

You'll be able to code it all in CircuitPython, including reading the built-in accelerator, setting a custom combinations, and more! Plus, you don't need any compilers or IDEs, just a text editor and a USB cable to connect.

This guide was first published on Dec 11, 2017. It was last updated on Dec 24, 2017.

This page (Combo Dial Safe) was last updated on Dec 10, 2017.

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