With a Pi4 in the middle of Audrey III and 4 heavy-duty motors, things might get a bit hot so we have fitted a fan to the top layer. This will pull hot air out and the holes in the back and side will allow some airflow over the boards.
The Pi was running at around 68 degrees and with the fan about 55 depending on what it's doing so we should not have any overheating, the Pi starts to throttle at 80C so better safe than sorry. This is especially true when you are trying to eek out as many frames per second as you can for the line following.
Here's a couple of pictures with a cutaway of the internals.
You may be wondering about the crudely cut fan hole in the top; The top layer is now being reprinted after testing with the hacked version.
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