- Ingredient: Laser, Day Night Sensor, Alarm/Ring, non-transparent paper or sticker
- How to do:
– Make a non-transparent paper or sticker as a tube, and put on the Day-Night Sensor Light to make it night time.
– Point The Laser into the tube to make it daytime. Make sure that they are all at the fixed positions.
- How it works:
– When the laser point to the Tube of Sensor It switch to day time. And when someone or something crosses the light of a laser, the Tube of Sensor it switches to night time, by the way, it switches the alarm to alert.
From: The Nightmare
