#define LED 13
const float GAMMA =0.7;
const float RL10 =50;



 void setup() {
  // put your setup code here, to run once:
  // 串口
  Serial.begin(115200);
  pinMode(LED, OUTPUT);


}
// float get_lux(void)
// {
//   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));
//   return lux;
// }
void loop() {
  // put your main code here, to run repeatedly:
  // float lux = get_lux();
  // bool isnearby = lux<50;
  // Serial.print("The lux is:");
  // Serial.println(lux);


  int analogValue = analogRead(A0);
  Serial.print(analogValue);
  Serial.print("\n");
  bool isNearby = analogValue >500;
  digitalWrite(LED, isNearby);
  delay(100);

}