Arduino Servo Motor and Photo Resistor Sensor

sketch.cpp

// http://www.bajdi.com/continuous-rotation-servos-and-arduino/
// Continuous Servo controls
// Counter clock-wise rotation is achieved using values from 45-89, fastest to slowest speed.
// Clock-wise rotation is achieved using values from 91-135, slowest to fastest speed.

// Servo Library
// https://www.arduino.cc/reference/en/libraries/servo/
#include <Servo.h>
Servo servo;

const int speedLow = 15;
const int speedMedium = 30;
const int speedHigh = 45;

const int lightSensorPin = 0;
const int servoPin = 9;

int lightValue;
int servoRotation;

void setup() {
  Serial.begin(115200);
  lightValue = analogRead(lightSensorPin);
}

// Rotate the servo clock
void clockwiseRotation(int speed){
  int servoSpeed;
  
  if ( speed > 45 ) {
    speed = 45;
  }

  // 90 is speed 0;
  servoSpeed = 90 + speed;
  
  servo.attach(servoPin);
  servo.write(servoSpeed);
  delay(5000);
  servo.write(90);
  servo.detach(); 
}

void counterclockwiseRotation(int speed){
  int servoSpeed;
  
  if ( speed > 45 ) {
    speed = 45;
  }

  // 90 is speed 0
  servoSpeed = 90 - speed;

  servo.attach(servoPin);
  servo.write(servoSpeed);
  delay(5000);
  servo.write(90);
  servo.detach();
}

void loop() {
  lightValue = analogRead(lightSensorPin);
  Serial.println(lightValue);
  if ( lightValue > 35 ) {
    Serial.println("Daytime");
    clockwiseRotation(speedHigh);
  } else {
    Serial.println("Nightime");
    counterclockwiseRotation(speedHigh);
  }
}