#include <Servo.h>

Servo solarMover;
int leftPhotoResistPin = A1;//pins in left and right resistors
int rightPhotoResistPin = A0;
int leftPhotoResistValue = 0; //Variables for the photoresistor values 
int rightPhotoResistValue = 0;
int photoDiff = 0; //the difference in left and right photoresistors
int solarMoverPos = 90; //Varaible for the base position of the servo motor ONLY WORKS IF THE SETUP IS EXACTLY THE SAME AS MINE WAS

Servo solarMoverHor;
int topPhotoResistPin = A2;//pins in left and right resistors
int bottomPhotoResistPin = A3;
int topPhotoResistValue = 0; //Variables for the photoresistor values 
int bottomPhotoResistValue = 0;
int photoDiff2 = 0; //the difference in left and right photoresistors
int solarMoverPos2 = 90; //Varaible for the base position of the servo motor ONLY WORKS IF THE SETUP IS EXACTLY THE SAME AS MINE WAS


void setup() {
  Serial.begin(9600);//sets the bits per second for serial data transmission
  solarMover.attach(11);//the pin the servo was attached to
  solarMoverHor.attach(9);
}

void loop() {
  rightPhotoResistValue = analogRead(rightPhotoResistPin);// reads values from the right photoresistor
  leftPhotoResistValue = analogRead(leftPhotoResistPin);// reads values from the left photoresistor

  topPhotoResistValue = analogRead(topPhotoResistPin);// reads values from the right photoresistor
  bottomPhotoResistValue = analogRead(bottomPhotoResistPin);// reads values from the left photoresistor

  /*
  Serial.print("rightphotoresistValue:  ");
  Serial.println(rightPhotoResistValue); //prints the value of the rightPhotoResistValue
  Serial.print("leftphotoresistValue:  ");
  Serial.println(leftPhotoResistValue); // prints the value of the leftPhotoResistValue
  */
  if(rightPhotoResistValue<50 && leftPhotoResistValue<50){ //checks if both of photoresistors are not getting much light
     while(solarMoverPos < 90 ){// if the photoresistors are both not getting light it will move the solar panel back to a base position 
        solarMoverPos++;//incriments angle
        solarMover.write(solarMoverPos);//updates the angle
        delay(10);//delays for 10 ms
     }
     while(solarMoverPos >90){
        solarMoverPos--;//decriments angle
        solarMover.write(solarMoverPos);//updates the angle
        delay(10);//delays for 10 ms
     }
  }
  photoDiff = rightPhotoResistValue - leftPhotoResistValue; //calculates the difference in the values of the photoresistors
  Serial.println(photoDiff);//prints the value of the difference for debugging
  if(photoDiff>25){ // checks if the difference is too much and the Right LDR is reading much higher than the left
    if(solarMoverPos>40){ // checks if the motor is already at the end of one side // this value for rotation comes specifically from the bounds of my setup
      solarMoverPos--; //decreases the rotation by 1
      solarMover.write(solarMoverPos); // sets the new rotation value.
    }
  }
  if(photoDiff<-25){ // checks if the difference is too much and the left LDR is reading much higher than the right 
    if(solarMoverPos<140){ // checks if the motor is at the highest value for safe rotation // this value for rotation comes specifically from the bounds of my setup
      solarMoverPos++; //increases the rotation by one
      solarMover.write(solarMoverPos); // sets the rotation
    }
  }
  delay(15);//delays 20 ms to make sure the machine is not rotating too fast
   
   if(topPhotoResistValue<50 &&  bottomPhotoResistValue<50){ //checks if both of photoresistors are not getting much light
     while(solarMoverPos2 < 90 ){// if the photoresistors are both not getting light it will move the solar panel back to a base position 
        solarMoverPos2++;//incriments angle
        solarMoverHor.write(solarMoverPos2);//updates the angle
        delay(10);//delays for 10 ms
     }
     while(solarMoverPos2 >90){
        solarMoverPos2--;//decriments angle
        solarMoverHor.write(solarMoverPos2);//updates the angle
        delay(10);//delays for 10 ms
     }
  }
      photoDiff2 = topPhotoResistValue - bottomPhotoResistValue;
        Serial.println(photoDiff2);
      if (photoDiff2 > 25) {
         solarMoverPos2--;
         solarMoverHor.write(solarMoverPos2);
      }
       if (photoDiff2 < -25) {
         solarMoverPos2++;
         solarMoverHor.write(solarMoverPos2);
      }
      delay(15);
}