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As you can see, the roof lifts off for adjusting the (East/West)sensitivity "pots". The "CDS" photocells are mounted up above on either side of the solar panel. Adjustable shaders are used for fine tuning the accuracy.
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The Control System uses an East and a West Cadmium Sulfide photoresistor (Sensors)to vary resistance to pin 2 of the corresponding 555 timer chip (East/West. The timer chips are wired for monostable "one shot" operation equal to approximately 1/10 of a second total output from pin 3 to the appropriate relay. The relays default to a positive voltage on either side of the motor (motor stopped). Light activates the appropriate timer/relay pair to momentarily ground one motor lead for motion.
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My Pantograph Machine