Answer Happy

Introduction This project is concerned with modeling and controlling a light seeking servo system used to improve the yield of solar cell or track an object. A light seeking servo system is a mechanism that orients itself towards an illumination source (figure-1) so that the line from the center of the mechanism to the light source coincides with the line orthogonal to the mechanism D2 D1 D2 To D1 © = 0 S2 S1 S2 $1 Figure-1: Light intensity-based orientation The orientation principle is based on the difference between two light sensors readings. These sensors are located opposite to each other on the light servo platform, T-ve Di <D2 S1> S2 0(S,,S2)= 0 D1=D2 Si=S2 [+ ve DI>D2 S1<S2 where Si is the signal from the i’th sensor, Di is the distance of the i’th sensor to the illumination source and is the misalignment between the light servo orientation and the light source. The overall system is expected to consist of the following components (figure-2): a holder with the two sensors situated opposite to each other. The output of the sensor is fed to an electrical
circuit whose output is in turn fed to another circuit whose job is to produce the control signal needed to actuate the DC motor. The holder is connected to shaft of the DC motor. Electronic Control DC Motor Circuit Circuit Figure-2: Outline of the servo
Project tasks: Step-1: Select an appropriate model for each module of the system and clearly state your choice and the corresponding parameters you selected for that module. For the control circuit you may use the transfer function: (S+Z1 G.(S)=K S+P where K, Z, P are parameters of the controller and L is a positive integer Step-2: Clearly show how the position of the target relative to the platform may be specified Step-3: Obtain the transfer function of the system