PLEASE SEND ME THE MATERIAL FOR SOLAR TRACKER USING OP-AMP.

The circuit and the mechanism explained in this article may be considered as the easiest and perfect dual axis solar tracker system.The device is able to track the daytime motion of the sun precisely and shift in the vertical axis accordingly.The device also effectively tracks the seasonal displacement of the sun and moves the entire mechanism in the horizontal plane or in a lateral motion such that the orientation of the solar panel is always kept in a straight axis to the sun so that it complements the vertical actions of the tracker appropriately.

Working
The heart of the above circuit is two voltage comparators made using LM358 Dual Op-Amp. We all know that when the intensity of light falling on a LDR increases, its resistance decreases. Here LDR is connected with a series resistor (R3 & R4), hence when the intensity of light falling on a LDR increases, voltage across corresponding resistor (R3 or R4) increases.

The output of the voltage comparator will be high when the voltage at non-inverting terminal (+) is higher than the voltage at the inverting terminal (-). Inverting (-) terminals of both comparators are shorted and connected to a variable resistor (RV1), which is used to set the reference voltage. Thus the sensitivity of both LDRs can be adjusted by varying the 10K pot shown on the left side of the circuit diagram. When the light falls on a LDR increases, voltage at the non-inverting (+) terminal of corresponding comparator increases and its output goes HIGH.