初学Arduino——按钮控制（四）

执行动作：

采用两个按钮控制，按下一个按钮时：led变为呼吸灯（先由灭到亮，再从亮到灭）；

                                当按下另外一个按钮并松开时，led灯瞬间灭掉。

int led = 3;
int button1 = 5;
int button2 = 8;
void setup() {
  // put your setup code here, to run once:
  pinMode(led, OUTPUT);
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (digitalRead(button1) == HIGH) {
    while (digitalRead(button1) == HIGH || digitalRead(button2) == LOW)
    {
      for (int fade = 0; fade <= 255; fade += 1) {
        if (digitalRead(button2) == HIGH) {
          digitalWrite(led, LOW);
          break;
        }
        analogWrite(led, fade);
        delay(5);
      }
      for (int fade = 255; fade >= 0; fade -= 1) {
        if (digitalRead(button2) == HIGH) {
          digitalWrite(led, LOW);
          break;
        }
        analogWrite(led, fade);
        delay(5);
      }
    }
  }
}