Published on February 11, 2015
Surprise your loved one with an electronic Valentine. :) When your special someone comes home and turns on the light, the heart will spin and the buzzer will sound at different rates. As the heart casts its shadow over the light sensor, the DC motor will spin slower and the buzzer will change pitch.
This project uses red legos and 3 brick adapters. Redesign yours with cardboard if you don't have legos.
Here is the video link: http://youtu.be/W5LgbGme758