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Lego Valentine

by JackANDJude

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

How To Make It

STEP 1 : Assemble circuit

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Assemble this circuit on brick adapters: power + wire + light sensor (light mode)+ wire + DC motor + buzzer

STEP 2 : Build a heart

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Build a lego heart as shown in the pictures, or substitute your own paper/cardboard heart.

STEP 3 : Build a tower with shelves

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Build a lego tower with 2x6 bricks or a combination of 2x4 and 2x2 bricks. Make shelves with 4x6 base plates. This is where your brick adapters will rest. I made 3 shelves: 1) The bottom shelf holds an upside down brick adapter underneath it for the power + wire. 2) The middle shelf holds an additional 4x6 base plate at a 90 degree angle. This is where I situated the wire + light sensor + wire on a brick adapter. 3) The motor sits on the top/center of the tower on a brick adapter with a buzzer next to it.

STEP 4 : Test & adjust

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Rearrange the shelves and adjust the light sensitivity so that the heart can cast a shadow on the light sensor only some of the time. That way the motor will go slower sometimes, and the buzzer will go on and off. It takes patience to make this electronic valentine turn on when someone turns on the light, but it is possible.

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