Build Instructions

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• 1

  Step 1

  I used some scrap wood to knock up a frame to hold the servos.

  There are three rows of three targets, and a space at the bottom for the controller. There's about 14cm between each servo, and about 20cm between each row. It doesn't really matter, as long as there is enough space between the servos for the targets to freely rotate.

• 2

  Step 2

  The targets are made from corrugated plastic rescued from my yard.

  I used a CD as a template, and added a little extra for a flat mate with the servo horn. The piezo sensor is taped in the middle, and the wires are run through a slit inside the plastic.

  I used bamboo skewers and hot glue to firmly attach the plastic target to the servo horn, and the horn should be screwed to the servo. This prevents them from just snapping off with a good hit.

  The cool pictures are just printouts, appropriately sized, cut out, and spray-glued on.

  http://www.iconarchive.com/show/starwars-longshadow-flat-icons-by-creativeflip.html
  

• 3

  Step 3

  Each piezo has a diode to rectify the signal, and a 5.1V zener to chop it down to size. I found a 470k resistor would bring it back down at about the right rate.

  I don't claim that this is the right or best way to deal with a piezo, but it worked and nothing blew up. Yet. I probably don't need both diodes.

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