Cover by David Erik Nelson

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Building It

  1. If you’ve elected to scrounge a motor from a broken cell phone or pager, start by making sure that your broken phone or pager has a vibrate function; if so, there will be a tiny, sprightly motor inside with a small weight mounted eccentrically on its shaft (see Figure 22-3 for examples). No vibrate means no motor. Having established that your phone or pager can vibrate, remove the lithium battery, and take out as many screws as you can find. Then use a screwdriver to pry open the plastic housing (there will usually be a single long seam running around the phone’s edge).

    Two scrounged vibrating motors (left) and a store-bought vibrator motor (right)

    Figure 22-3. Two scrounged vibrating motors (left) and a store-bought ...

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