20 Makey Makey Projects for the Evil Genius by Aaron Graves

Author:Aaron Graves
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2017-04-09T04:00:00+00:00

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Figure 1-101 Nail basket.

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Figure 1-102 Wiring the V.

Step 19: Teeter-Totter Channel Switch

This switch uses a U-shaped channel made from sheet metal or posterboard that tilts on a straw. When the channel tilts, the metal channel or conductive tape touches a strip of conductive tape or fabric on the playing surface of the machine completing a circuit. Begin by making a channel out of thin cardboard or metal. If you are using sheet metal, be sure to add some tape to the sharp edges. If you use poster board later, you will coat the end with conductive tape where the channel will make contact with the playing surface. Cut a skewer ½ inch longer than the width of the channel. Use a hot-glue gun to place it almost on the center perpendicular to the channel with the skewer hanging about ¼ inch over each side. Due to the imbalance, one side will naturally rest on the playing surface; you will want that side to face the front of the machine. Speed is everything in the success of the switch, and you want the ball to be traveling at just enough speed to tilt the channel. Try moving the channel around to see where the best placement will be. When you have found the best place, mark the bottom edge and the position of the skewers. Drill a small hole just off to the side by the center of the channel and place some hookup wire through it. Strip the end of the wire, and attach it to the channel with conductive tape, as shown in Figure 1-103. If you are using poster board, run a line of tape over the wire and then to the end of the channel. Coat the end and edge with conductive tape. Put the channel back in place using the marks you made earlier, and tilt the far end down. Place some guide marks where the channel meets the playing surface when it is tilted. Just off to the side of these marks, drill a small hole and run hookup wire through it. Place conductive tape over the wire, and make a contact pad in this area (see Figure 1-104). Return the channel to position, slide a ¼-inch piece of straw over each end, and glue them in place, being careful to avoid getting glue on the skewer.

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