Supplies

  • a photoresistor, such as RadioShack part #276-1657

  • a 2N3904 transistor

  • a 4.7k ohm resistor (coded with yellow-purple-red stripes)

  • one vibrator motor (This can be scrounged from a cell phone or pager or purchased new at RadioShack—part #273-107.)

  • a 3-volt CR2032 button cell battery

  • a CR2032 battery clip, such as RadioShack part #270-009

  • 24-gauge insulated hook-up wire (unnecessary if your battery clip and motor have leads)

  • two 5/8″ ball bearings

Tools and supplies

Figure 22-2. Tools and supplies

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