#define LDR A0                               //LDR pada pin A0
#define MAX_ADC_READING 1023
#define ADC_REF_VOLTAGE 5.0
#define REF_RESISTANCE 10000
#define LUX_CALC_SCALAR 125235178.3654270
#define LUX_CALC_EXPONENT -1.604568157
const int led = 3;
int nilai = 0;
void setup() {
  Serial.begin(9600);
  pinMode(led, OUTPUT);
  digitalWrite(led, 0);

}

void loop() {
 int ldrRawData;
  float resistorVoltage, ldrVoltage;
  float ldrResistance;
  float ldrLux;

  ldrRawData = analogRead(LDR);   //Baca sensor

  //------------Konversi  dari data analog ke nilai lux------------//
  resistorVoltage = (float)ldrRawData / MAX_ADC_READING * ADC_REF_VOLTAGE;
  ldrVoltage = ADC_REF_VOLTAGE - resistorVoltage;
  ldrResistance = ldrVoltage / resistorVoltage * REF_RESISTANCE;
  ldrLux = LUX_CALC_SCALAR * pow(ldrResistance, LUX_CALC_EXPONENT) + 4;
 nilai = ldrRawData;
 nilai = map(nilai, 0, 1015, 255, 0);

 Serial.print("ADC :");
 Serial.println(ldrRawData);
 
 
 Serial.print("LUX :");
 Serial.println(ldrLux);
analogWrite(led, nilai);
if (nilai >=101){
  digitalWrite(led, 0);
}

 delay(100);

}