#define MINL 500
#define MAXL 20

const int sensorPin = A0; // 光敏电阻接入的模拟引脚
const int ledPin = 9;     // LED灯接入的PWM引脚

void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  int lightLevel = analogRead(sensorPin); // 读取光敏电阻值
  Serial.println(lightLevel);

  // 根据差异值调整LED亮度
  int ledBrightness = map(lightLevel, MAXL, MINL , 0, 255);
  ledBrightness = constrain(ledBrightness, 0, 255); // 限制亮度在0到255之间
  analogWrite(ledPin, ledBrightness);

  // 输出当前的光敏电阻值和LED亮度值到串口监视器
  Serial.print("Light Level: ");
  Serial.print(lightLevel);
  Serial.print(" | LED Brightness: ");
  Serial.println(ledBrightness);
  
  delay(100); // 延时100毫秒
}