#define LDR_PIN 15

// LDR Characteristics
const float GAMMA = 0.7;
const float RL10 = 50;


void setup() {
  Serial.begin(9600);
  pinMode(LDR_PIN, INPUT);  
}

void loop() {
  int analogValue = analogRead(LDR_PIN);
  
  // float voltage = analogValue / 1024. * 5;
  // float resistance = 2000 * voltage / (1 - voltage / 5);
  // float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  
  // float voltage = analogValue * (3.3 / 4095);  // 将模拟值转换为电压值
  // float illuminance = 500 / voltage;  // 根据光敏电阻的特性计算光照度

  float  illuminance = 39810 * pow(2.71828, -0.01534 * analogValue)+ 3467*pow(2.71828,-0.002379 * analogValue);

  Serial.print("光照度: ");
  Serial.print(illuminance);
  Serial.println(" lux");

  delay(1000);
}