#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);
#include <Servo.h>
Servo myservo;

#define LEDpin 13 
#define LDRpin A0
#define POTpin A1
#define SWpin 8

const float GAMMA = 0.7;
const float RL10 = 50;

boolean State = LOW;

void setup() {
 Serial.begin(115200);
 lcd.init();
 lcd.backlight();
 myservo.attach(5);
 myservo.write(0); 
 pinMode(LEDpin, OUTPUT);
 pinMode(SWpin, INPUT);

}


void loop() {
 //--------------------------- Switch ----------------------------
 if (digitalRead(SWpin) == LOW) {
   State = !State;
 }


 //--------------------------- LDR ----------------------------
 int LDRval = analogRead(LDRpin);
 float voltage = LDRval / 1024. * 5;
 float resistance = 2000 * voltage / (1 - voltage / 5);
 float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
 
 //--------------------------- POT ----------------------------
 int POTval = map(analogRead(POTpin),0,1023,0,180);

 if (State == HIGH) {
 
 //--------------------------- Serial Monitor -----------------
 Serial.print("Light : ");
 Serial.print(long(lux));
 Serial.print("\t POT Value : ");
 Serial.println(POTval);
 Serial.print("SW state : ");
 Serial.println(State);

 //--------------------------- LED ----------------------------
 if (long(lux) <= 300) {
   digitalWrite(LEDpin, HIGH);
 }
 else {
   digitalWrite(LEDpin, LOW);
 }

 myservo.write(POTval); 

 //--------------------------- LCD ----------------------------
 lcd.clear();
 lcd.setCursor(2, 0);
 lcd.print("TEST SKILL START");
 lcd.setCursor(0, 1);
 lcd.print("Light : " + String(long(lux)) + " Lux");
 lcd.setCursor(0, 2);
 lcd.print("Servo : " + String(POTval) + " Degree");
 
 delay(2000);
 }
 else {
   lcd.clear();
   lcd.setCursor(2, 0);
   lcd.print("TEST SKILL STOP");
   delay(2000);
 }

}