Security House

Project Number: 21

Parts Needed: Regular Base Grid (Grid A), 4 Mini Base Grids (B, C, D & E), 4 Base Grid Supports, 6 Stabilizers, Battery Holder (B3), 3 1-Snap Wires, 6 2-Snap Wires, 2 3-Snap Wires, 4 Vertical Snap Wires (V1), 5.1K-Ohm Resistor (R3), 2 Blue Jumper Wires, Horn (W1), Red Jumper Wire, NPN Transistor (Q2), Phototransistor (Q4), Q4 Attachment, 1 5-Snap Wire, Color LED (D8), Black Jumper Wire, Light Tunnel (U30), White LED (D6), 1 4-Snap Wire, Slide Switch (S1).

Assembly (adult supervision highly recommended):

1. Place base grid supports on base grid A.

2. Place parts (except for the jumper wires) on base grids B & C, and install into base grid supports on grid A. The pegs should be facing inward.

3. Place remaining parts on grid A.

4. Place parts (except jumper wires) on grid D.

5. Mount grids D & E, at 45 degree angles and with pegs oriented as shown (down for grid D, up for grid E), on top of grids B & C using 6 stabilizers. Adjust the positions of the stabilizers as needed.

6. Gently place the light tunnel (U30) on grid E.

7. Add the Q4 attachment and jumper wires (2 blue, 1 red, and 1 black).

Description: Turn on the slide switch (S1); the white LED (D6) and light tunnel should be on, but there should not be any sound. Now place your hand between the white LED and the phototransistor (Q4); an alarm sounds and the color LED (D8) turns on.

Snappy: You can place an object inside this house, If an intruder tries to reach in and grab it, then the alarm sounds and color LED flashes to scare the intruder away.