robot guts

Posted on Feb 5, 2014

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
Click here to download the full size of the above Circuit.

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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