// LCD1602 to Arduino Uno connection example
#include <Servo.h>
#include <LiquidCrystal.h>
#define SPEAKER_PIN 5
const float BETA = 3950;
int pos=180;
bool isFin=false;
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
Servo myservo;  
void setup() {
  lcd.begin(16, 2);
  myservo.attach(6);   
  Serial.begin(9600);
  pinMode(SPEAKER_PIN, OUTPUT);
}

void loop() {
  const float GAMMA = 0.7;
  const float RL10 = 50;
  int analogValue = analogRead(A0);
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  lcd.setCursor(0, 0);
  lcd.print("Status:");
  if(lux>=50){
    lcd.print("Lighting");

  }else{
    lcd.print("Dark");

  }
  lcd.setCursor(0, 1);
  lcd.print("Lux:");
  lcd.print(lux);
  
  if(pos>0&&lux>=50){
    isFin=false;
    for(pos = 180; pos >= 0; pos -=1){
      myservo.write(pos);
      if(pos%20==0){
      tone(SPEAKER_PIN, 2000);}
      delay(15);
      noTone(SPEAKER_PIN);
    }
    isFin=true;
  }
  else if(pos<=0&&lux<50){
    isFin=false;
    
    for(pos = 0; pos <= 180; pos +=1){
      myservo.write(pos);
      if(pos%20==0){
      tone(SPEAKER_PIN, 2000);}
      delay(15);
      noTone(SPEAKER_PIN);
    }
    isFin=true;
  }
  delay(500);
  lcd.clear();
}