ch1_1漸變LED， LED接第3腳，低電位作動。

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LED接第3腳，低電位作動。

//ch1_1

#define LED 3

void setup()

{

  pinMode(LED,OUTPUT);

  digitalWrite(LED,1);

}

void loop()

{

  analogWrite(LED,200);

  delay(200);

  analogWrite(LED,150);

  delay(200);

  analogWrite(LED,100);

  delay(200);

  analogWrite(LED,50);

  delay(200);

  analogWrite(LED,0);

  delay(200);

  analogWrite(LED,50);

  delay(200);

  analogWrite(LED,100);

  delay(200);

  analogWrite(LED,150);

  delay(200);

  analogWrite(LED,200);

  delay(200);

  analogWrite(LED,255);

  delay(1000);

}