#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
const int ledPin = 25;  // 16 corresponds to GPIO16

// setting PWM properties
const int freq = 1000;
const int ledChannel = 0;
const int resolution = 8;
int LDR_Val = 0;     
int sensor = 34;      
int led = 25;      

void keliphidup(){
  for(int dutyCycle = 0; dutyCycle <= 255; dutyCycle++){   
    // changing the LED brightness with PWM
    ledcWrite(ledChannel, dutyCycle);
    delay(10);
  }
}
void kelipmati(){
  // decrease the LED brightness
  for(int dutyCycle = 255; dutyCycle >= 0; dutyCycle--){
    // changing the LED brightness with PWM
    ledcWrite(ledChannel, dutyCycle);   
    delay(10);
  }
}
void setup() {
    lcd.init();               // initialize the lcd
    lcd.backlight(); 
      
    pinMode(led, OUTPUT);  
    ledcSetup(ledChannel, freq, resolution);
  
  // attach the channel to the GPIO to be controlled
  ledcAttachPin(ledPin, ledChannel);
}
void loop() {
    LDR_Val = analogRead(sensor);   
    Serial.print("LDR Output Value: ");
    Serial.println(LDR_Val);   
    if(LDR_Val > 100) {       
        lcd.clear();
        lcd.setCursor(0, 0); // start to print at the first row
        lcd.print("LDR: ");
        lcd.print(LDR_Val);
        lcd.setCursor(0, 1);
        lcd.print(" Intensiti Tinggi ");
        keliphidup(); 
        delay(15);
        kelipmati();
    }
    else {
        lcd.clear();
        lcd.setCursor(0, 0); // start to print at the first row
        lcd.print("LDR: ");
        lcd.print(LDR_Val);
        lcd.setCursor(0, 1);
        lcd.println("Intensiti Rendah ");
        kelipmati();  
    }
    delay(15);
}