Step 3Prepping the Project Box
If possible, try to fit the battery holder into the box, and see if you have enough room to mount your board(s), switch(es) and wires as well. Mine all just barely fit. If not, you will have to find another box for the batteries. The ubiquitous Altoids tin will work just dandy.
With all this in mind, drill holes for the wires you will be bringing in and out, and the switch(es). When you eventually start wiring things in, make sure to give the wire a good overhand knot just as it enters the box, so they aren't unexpectedly ripped out. Which would probably not be good.
Determine the size of the perfboard you will need and cut it. The bigger the better, as you'll have more room to futz with, but sometimes you're a little crammed for space. Glue down/attach your battery pack and mount your board(s) with the standoffs.
The red board in there is sparkfun's "skinny" version of the Arduino, which will eventually drive the aforementioned turning signals, which aren't wired up yet.
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