#include <Servo.h>

/*
Into Robotics
*/
 
int servoPin = 9;
int ldrPin = A0;
Servo servo;  
 
int servoAngle = 0;   // servo position in degrees
int currentAngle = 0;
int targetAngle = 0;
int ldrValue = 0; 
void setup()
{
  Serial.begin(9600);  
  servo.attach(servoPin);
  pinMode(ldrPin, INPUT);
}
 
 
void loop()
{
//control the servo's direction and the position of the motor

/*   servo.write(45);      // Turn SG90 servo Left to 45 degrees
   delay(1000);          // Wait 1 second
   servo.write(90);      // Turn SG90 servo back to 90 degrees (center position)
   delay(1000);          // Wait 1 second
   servo.write(135);     // Turn SG90 servo Right to 135 degrees
   delay(1000);          // Wait 1 second
   servo.write(90);      // Turn SG90 servo back to 90 degrees (center position)
   delay(1000);*/

//end control the servo's direction and the position of the motor
  ldrValue = analogRead(ldrPin);
  Serial.println(ldrValue);
  delay(1000);
  if (ldrValue < 450){
    targetAngle = 0;
    if (currentAngle >= targetAngle){
      for(servoAngle = currentAngle; servoAngle >= targetAngle; servoAngle--) {
        servo.write(servoAngle);
        delay(20);
        }
      } else {
      for(servoAngle = currentAngle; servoAngle <= targetAngle; servoAngle++) {
        servo.write(servoAngle);
        delay(20);
        }
      }
      currentAngle = targetAngle;

    } else if (ldrValue < 900 ) {
    targetAngle = 50;
    if (currentAngle >= targetAngle){
      for(servoAngle = currentAngle; servoAngle >= targetAngle; servoAngle--) {
        servo.write(servoAngle);
        delay(20);
        }
      } else {
      for(servoAngle = currentAngle; servoAngle <= targetAngle; servoAngle++) {
        servo.write(servoAngle);
        delay(20);
        }
      }
      currentAngle = targetAngle;
      } else {
    targetAngle = 140;
    if (currentAngle >= targetAngle){
      for(servoAngle = currentAngle; servoAngle >= targetAngle; servoAngle--) {
        servo.write(servoAngle);
        delay(20);
        }
      } else {
      for(servoAngle = currentAngle; servoAngle <= targetAngle; servoAngle++) {
        servo.write(servoAngle);
        delay(20);
        }
      }
      currentAngle = targetAngle;
  }
}