Make: Volume 86

illuminate, and then extinguish as you move the

magnet away. Make sure all four assemblies are

illuminating the correct segments (and digits)

(Figure

I

).

That was (hopefully) quick and easy! Let’s get

all these assemblies mounted into their cases

and let the magic begin.

FINAL ASSEMBLY

Time to put it all together! Note the direction

arrow on the inside bottom of each case. For

the following steps, orient all the cases with the

arrow pointing up.

1. Mark the 6" (15cm) length of foam every 1½"

(3.8cm) and cut it with scissors into four equal

pieces (Figure

J

).

2. Select one of the PCB assemblies and center

the battery pack in the bottom of the case, ...