MISSION 8
Door Sensor to Tell When Your Room Is Under Attack
Little brothers, big sisters, none of them belong in your room—unless, of course, you share it with them. If you want to keep your home safe and siblings out your room, then I’d recommend the cookie jar lock for your belongings. This door alarm can work on any door, so you could add it to a closet or wardrobe instead.
The door sensor works on electrical signals. When two wires are touching, they let electricity flow from one to the other. If that connection is broken, then we can sense that electrically.
Back in Mission 1, you created a touch sensor to test whether a family member is a zombie. This worked because humans conduct electricity. Now we can’t stay in our room all day waiting ...
Get Save the World with Code: 20 Fun Projects for All Ages Using Raspberry Pi, micro:bit, and Circuit Playground Express now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
