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invention

Domain Defender

by emily_littlebits

Published on August 2, 2016

Invent your own defense systems to guard your stuff. Warning: Keep out! Connect the Domain Defender to your drawers, and this loyal launcher will fling projectiles when someone tries to break in. Tweak it to amp up the accuracy, power, or camouflage ability.

Duration: 40 minutes (minimum)

How To Make It

STEP 1 :

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BUILD YOUR CIRCUIT.

STEP 2 :

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PRESS THE SERVO HUB ONTO THE SERVO AND ADJUST THE SERVO TO TURN MODE.

STEP 3 :

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PRESS SERVO INTO THE SERVO MOUNT FROM THE SIDE AND SCREW IN.

STEP 4 :

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PRESS YOUR CIRCUIT AND SERVO MOUNT ONTO THE MOUNTING BOARD. Check out mounting board tips & tricks here.

STEP 5 :

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WITH POWER ON, connect the mechanical arm to the servo hub, parallel to the mounting board, as shown.

STEP 6 :

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ON THE MAKEY MAKEY BIT, CLIP ONE OF THE ALLIGATOR CLIPS TO THE LEFT ARROW PAD AND THE OTHER TO THE EARTH PAD.

STEP 7 :

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TEST YOUR CIRCUIT! Touching the ends of both alligator clips should cause the servo to swing to the right.

STEP 8 :

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ATTACH YOUR CIRCUIT TO A BOOK

STEP 9 :

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TAPE TWO PIECES OF FOIL TO THE EDGE OF A DRAWER, AND ATTACH THE ALLIGATOR CLIPS TO THE FOIL AS INDICATED.

STEP 10 :

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MAKE THE BUCKET FOR THE LAUNCHER USING TEMPLATE B.

STEP 11 :

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SLIP THE BUCKET ONTO THE FREE END OF THE MECHANICAL ARM.

STEP 12 :

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CRUMPLE UP A HALF-SHEET OF NOTEBOOK PAPER OR A SMALL PIECE OF FOIL TO LAUNCH.

STEP 13 :

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LAUNCH TIME! Opening the drawer will make the pieces of foil touch and activate the servo.

STEP 14 : PLAY!

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PRETEND TO BE THE INTRUDER TRYING TO RUMMAGE THROUGH YOUR DRAWER. Is the launcher pointed in the right direction? What could you do to make your defense system more effective?

STEP 15 : HOW IT WORKS

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  • The POWER Bit provides electricity to the circuit.
  • The MAKEY MAKEY Bit sends an ON signal when the LEFT ARROW pad and EARTH pad are connected. This happens when the drawer opens and the two pieces of foil touch, allowing electricity to flow through the circuit.
  • When the SERVO receives the signal, it turns, rotating the arm and throwing the projectile.
  • MECHANICAL ARM: As the bucket gets farther from the hub, it also takes more force to move it. If your arm gets too long it will overpower the servo motor and will be hard to move. This relationship between distance and force is called torque.

STEP 16 : REMIX

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TRY SOME OF THESE IDEAS TO CUSTOMIZE YOUR INVENTION. THEN COME UP WITH YOUR OWN!

  • ADD AN ALARM. Try adding a buzzer to your defenses, and catch your intruders in the act!
  • IMPROVE THE LAUNCHING ARM. Try extending the arm, or swapping the bucket template for other materials, like a paper cup.
  • CAMOUFLAGE YOUR DEFENSES. Keep your intruders guessing by placing the DOMAIN DEFENDER in different places, or hiding it behind other objects.

STEP 17 : SHARE

MAKE A REACTION VIDEO OF YOUR WOULD-BE BURGLAR, THEN SHOW THE COMMUNITY HOW YOU PROTECTED YOUR SECRET STASH ON THE LITTLEBITS INVENT APP!

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