#include <ESP32Servo.h>
#define ldrPin 2
const int servoPin = 18;
const float gama = 0.7;
const float rl10 = 50;
Servo servo;
void setup() {
  
  Serial.begin(115200);
  Serial.println("Hello");
  servo.attach(servoPin, 500, 2400);
}
int pos = 0;
void loop() {
 
  delay(10); 
  int nilaiLDR = analogRead(ldrPin);
  nilaiLDR = map(nilaiLDR, 4095, 0, 1024, 0);
  float voltase = nilaiLDR / 1024.*5;
  float resistansi = 2000 * voltase / (1-voltase/5);
  float kecerahan = pow(rl10*1e3*pow(10,gama)/resistansi,(1/gama));
  Serial.print("Intensity of light= ");
  Serial.println(kecerahan);
  for (pos = 0; pos <= 180; pos += 1) {
    servo.write(pos);
    delay(15);
  }
  for (pos = 180; pos >= 0; pos -= 1) {
    servo.write(pos);
    delay(10);
  }
}