3Di Fun

Project Number: 18

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

Assembly: Follow these assembly instructions, in order, using the photo on the box cover (and the cover of this booklet) as a guide:


 * 1) . Place base grid supports on the base grid labeled A in the drawing.
 * 2) Place parts on grid C, and install into base grid support on grid A. Note that part of a vertical snap wire (V1) is under the white LED (D6).
 * 3) Place parts on grid B (except the vertical snap wire that connects to grid C, and the 2-snap and 3-snap wires that attach to it), and install into base grid supports on grid A.
 * 4) Finish connection of the V1 connecting between grids B-C, add the snap wires that attach to it, and add the stabilizer between grids B & C.
 * 5) Install remaining parts on grid A.
 * 6) Add the projector, mirror, and Q4 attachment.

Description: Turn on the slide switch (S1). The projector projects an image across the room (it is best viewed in a dark room), turn its knob to select different images. To trigger an alarm, align the mirror so light from the color LED (D8) reaches the phototransistor (Q4); remove and re-install it in the spring if needed. The images from the projector are rotated.

Snappy: This circuit is shown on the cover of the Snap Circuits® 3D Illumination box and manual. Use that picture to help with building it.