April 2020
Intermediate to advanced
224 pages
6h 2m
English
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 ...