const int sliderPin = 34;  // 连接滑动变阻器的GPIO引脚
const int ledPin = 25;     // 连接LED的GPIO引脚

void setup() {
  pinMode(sliderPin, INPUT);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  int sliderValue = analogRead(sliderPin);
  int brightness = map(sliderValue, 0, 4095, 0, 255);
  analogWrite(ledPin, brightness);
}