ST-1

This is a lightseeking robot which
basically consists of two headstructures
mounted back to back.
So it has 2 motors and 4 eyes (LDR's).
It reacts to light-imbalance, when both
eyes of one side see an equal amount
of light, the motor on that side stops.
When one eye of a pair sees more light
than the other, the motor turns in the
direction of the light until the balance is
restored and then stops again.

Its controller consists of two identical
circuits which share a common
powersupply, 4 AAAbatteries.