Page 304 - Making things move_ DIY mechanisms for inventors, hobbyists, and artists

Chapter 10 Projects 281

• Files, sandpaper, or (preferably) a Dremel tool

• Lazy Susan (McMaster 6031K17)
• Six #4 flat head wood screws 1 1/4 in long (McMaster 90031A117)
• Eight #4 flat head wood screws 1/2 in long (McMaster 90031A110)

• Phillips head screwdriver
• Drill (portable or drill press) and drill bits: 1/2 in, 1/4 in, 1/8 in, and 1/16 in
• Epoxy putty

• Electronics
• DC gearhead motor with about 12 in hook-up wire leads soldered to
terminals (an old Solarbotics GM9 used here)
• Corresponding battery (9V used here) and snap or holder with wire leads
(like RadioShack 270-324)
• Four AA batteries and holder (like SparkFun PRT-00552)
• Breadboard (like All Electronics PB-400)

• Jumper wires (like SparkFun PRT-00124) or hook-up wire to make your own
• Black electrical tape (McMaster or any hardware store)
• TIP120 Darlington transistor (Digi-Key TIP120-ND or Jameco 32993)

• Phototransistor (All Electronics PTR-1)
• IR LED (All Electronics ILED-8)
• On-off toggle switch (like SparkFun COM-09276) or other SPST switch with
about 4 in hook-up wires soldered to the legs
• Diode (SparkFun COM-08589)

• 22KΩ resistor (RadioShack 271-1339)
• 100KΩ resistor (RadioShack 271-1311)
Box Recipe:

1. Use a hacksaw, band saw, or table saw, or ask your local lumber or hardware
store to cut the wooden squares and side pieces. Sand, file, or Dremel any
rough or splintered edges.