Introduction: Lightning Paku-paku

About: AgIC is named after Silver Ink Circuit (Ag is the chemical symbol of silver). We develop products to make electric circuits more accessible and catalyze fusion of technology with design and crafts.

This instructable instructs how to make a lightning Paku-paku. Paku-paku is a traditional origami work which is known as "Paper Fortune Teller" in English. In Japanese, we call it "Paku-paku." This origami is very fun to play because it has the interaction that you can open and close the cells. In this instructables, we are making an interactive lightning Paku-paku that lights up when closed, and turns off when opened. Let's get started!

Step 1: Materials

You will need things below to make a lightning Paku-paku:
  • a piece of AgIC special photo glossy paper (A4)
  • an AgIC conductive ink marker
  • a button cell
  • surface mounted LED x 4
  • some copper tape
  • some scotch

Step 2: Construct Paper Fortune Teller

Construct Paper Fortune Teller from AgIC paper. Instructions are shown in the second figure. This figure is from Paper Fortune Teller page on Wikipedia.

Step 3: Design the Electric Circuit

Let's think about the electric circuit that we are going to draw on the Paku-paku. The simplified version of the circuit we are making is shown as in the first figure. Four switches in series, and four LEDs in parallel. By designing like this, the LEDs on the Paku-paku will light up only when all the corners closed.

OK, then, how we can actually draw this circuit on the Paku-paku? This part might be the most difficult part in this instructables, but the lines shown in the second figure will do a lot to help. The orange lines drawn vertically and horizontally represent the physical separations between the corners of Paku-paku, and those drawn diagonally represent the folds on each corner. The green lines are just the guides to help draw the circuit, and you can actually draw these green lines on the Paku-paku if you think it helps. Now, look at the third figure, which shows the transformed circuit which is the same electric circuit as that in the first figure. The point is the red circle, where you have to bridge the intersected lines. This bridge cannot be done with AgIC marker, so we have to leave here open for now. We are seeing the solution how to make the bridge later.

Step 4: Draw Circuit With AgIC Marker As Designed

Now, we have the design, so let's draw it on the Paku-paku with AgIC marker. The first image shows how you can draw the surfaces which will contact each other. The switches have to be unconnected, and have to be drawn broadly so that the contact occurs easier. The lines designed to be connected have to be connected. You can achieve it by using some copper tape like shown in the image. Also, you should make sure the folds to be covered with the copper tape because it is very likely to happen that the circuit is cut on the folds.

After drawing the lines, attach the LEDs in right directions as shown in the third image.

Step 5: Attach the Button Cell

We are using a special button cell which has metal arms like in the images. This kind of button cell is included in the AgIC starter kit, but if you do not have one, you can make them by yourself. As shown in the first and the second image, you have to wrap the cell with scotch. This insulation will avoid the unnecessary conducting between the body of the cell and the circuit drawn on the surface of Paku-paku. This is the trick we mentioned before for the bridge at the intersection part of the circuit.

Step 6: Done!

We are all done now. Let's play with the Paku-paku you just made !

The LEDs should light up when you close the corners. If not, make sure the connection of each line (maybe mostly at the folds). You can reinforce the connection by by drawing over and over on the same lines, or by adding more copper tape. Electric test meters would be a great help when you debug.

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