const int button1 = 9;
const int button2 = 10;
const int ledLamp = 11;
int bright = 0;
boolean lastButton1 = LOW;
boolean lastButton2 = LOW;
boolean isSecond1 = LOW;
boolean isSecond2 = LOW;

void setup() {
  Serial.begin(9600);
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);
  pinMode(ledLamp, OUTPUT);
}

void loop() {
  boolean valueButton1 = digitalRead(button1);
  boolean valueButton2 = digitalRead(button2);
  delay(10);
  if (valueButton1 == HIGH && lastButton1 == LOW) {
    Serial.println("Button 1");
    if (isSecond1 == HIGH) {
      Serial.println("Yes");
      isSecond1 = LOW;
      bright = bright + 50;
    } else {
      Serial.println("No");
      isSecond1 = HIGH;
    }
    lastButton1 = HIGH;
  } else if (valueButton2 == HIGH && lastButton2 == LOW) {
    Serial.println("Button 2");
    if (isSecond2 == HIGH) {
      Serial.println("Yes");
      isSecond2 = LOW;
      bright = bright - 50;
    } else {
      Serial.println("No");
      isSecond2 = HIGH;
    }
    lastButton2 = HIGH;
  } else {
    lastButton1 = valueButton1;
    lastButton2 = valueButton2;
  }

  if (bright < 0) {
    bright = 0;
  } else if (bright > 255) {
    bright = 255;
  }
  analogWrite(ledLamp, bright );
}