robot guts

  
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The headlights and photo cells will face the ground, so I find it easiest to imagine that the whole circuit is upside down Why 3 LEDs per side As far as I can tell, because you can`t power three in series from a single 9V battery without a little help, and this way Cook could include transistors in the circuit. The robot`s thinking is simple. The lone IC is an NTE943M low power, low offset, dual voltage comparator.
robot guts - schematic

It identifies which set of photo resistors is running at a higher voltage (a function of increased resistance, meaning which set is receiving less light), and lights the set of LEDs corresponding with the other set ” the set receiving more light.



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