boolean pushButton1;
boolean pushButton2;
int ledPin = 13;
int brightness = 128;
 


void setup() {
 pinMode(25, INPUT_PULLUP);
 pinMode(26, INPUT);
 pinMode(13, INPUT_PULLUP);

Serial.begin(9600);

}

// the loop function runs over and over again forever
void loop() {
  pushButton1 = digitalRead(25);
  pushButton2 = digitalRead(26);
  // 按下为0，pushButton为0,!pushButton,表示按下
//按下为0，pushButton为0
  if (!pushButton1 && brightness > 0){ // 按下开关1且LED亮度大于0
    brightness--; // 减低灯亮度  
    //brightness-- =  brightness =  brightness - 1

  }else if(pushButton2 && brightness < 225){ // 按下开关2且灯亮度小于225
    brightness++; // 增加
      //brightness++ =  brightness =  brightness + 1
  }
  analogWrite(ledPin,brightness);
  Serial.println(brightness);
  Serial.println(pushButton2);
  Serial.println(pushButton1);
  delay(10);




  }