#define POT         26
#define LED         13
#define CHANNEL     0
#define RESOLUTION  12
#define FREQ        1000

int pot_value;

void setup() {
  // 设置ADC分辨率
  analogReadResolution(RESOLUTION);
  // 配置输入衰减
  analogSetAttenuation(ADC_11db);
  // 建立LEDC通道，配置LEDC分辨率
  ledcSetup(CHANNEL,FREQ,RESOLUTION);
  // 关联GPIO与LEDC通道
  ledcAttachPin(LED,CHANNEL);

}

void loop() {
  // 获取模拟信号输入植
  pot_value = analogRead(POT);
  // 输出PWM
  ledcWrite(CHANNEL,pot_value);
  delay(50);

}