DIY Hidden Safe with Intrusion Detector
In the past few years, we have covered plenty of interesting safes here. Adafruit has shared a guide that shows you how to build your own safe to hide your things in plain sight. It also has an intrusion detector with a Circuit Playground Express.
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As the book is opened, the LEDs activate to show intrusion. The Detector can show you when intrusion attempts have been made or someone has tried to tamper with it.[Source]
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