Using a 9/64 drill, make three holes.
Remove the template using hot
water. Place the lens over the
smoothed end of the PVC pipe and
mark the pipe where the holes are.
Using a #36 drill, make the three
holes 1/2” deep. Tap each hole with
a 6-32 tap.
Using three 1” screws, add a
drop of “super glue” to each hole
and drive each screw into the PVC
pipe. Use a cut-off tool and remove
the heads. Glue a second piece of
Plexiglas on the bottom. The top
lens is secured using three knurled nuts.
Cut a piece of .06” x .125” Styrene plastic strip to
7. 75 inches. Bend the strip and
place it 3/4” from the top edge of
the PVC pipe. Again, using super
glue, attach the strip in place. This
will act as a support for the board.
If you don’t want to build the
holder, the available kit comes with
a tin container which the battery
holder and the PCBs fit into. Just
add your own foam insulation.
Using the Unit
Plug in the accelerometer that
you are going to use. Plug in the SD card holder to the
10 pins. It will rest on the accelerometer board (Figure 6).
November 2014 37
■ FIGURE 6.