Here you can see a better view of the circuitry for the extra line sensors.
I also added a couple of slide switches. You can see one of them just above
and to the right of the brown circuit board. One of the switches toggles
between Mini-Sumo and Line-Following modes, and one of them provides an
initial Left/Right hint for the initial direction to turn in Mini-Sumo. I've
never actually used this feature, but it's there.
Smaller...
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