Arduino UNO學習331．內建範例-PWM與數位

Arduino學習331．內建範例-PWM與數位

前面的學習都知道了UNO板的數位接腳2,4,7,8,12,13,和3,5,6,9,10,11,

二者之間的不同,標示差異多了”～”符號,表示該腳位才可傳送PWM數據

硬體準備

分別由數位腳Pin2~13各接上燈及電阻共12個

打開內建範例>Analog>AnalogWriteMega

// These constants won't change.  They're used to give names

// to the pins used:

const int lowestPin = 2;

const int highestPin = 13;

void setup() {

  // set pins 2 through 13 as outputs:

  for (int thisPin = lowestPin; thisPin <= highestPin; thisPin++) {

    pinMode(thisPin, OUTPUT);

  }

}

void loop() {

  // iterate over the pins:

  for (int thisPin = lowestPin; thisPin <= highestPin; thisPin++) {

    // fade the LED on thisPin from off to brightest:

    for (int brightness = 0; brightness < 255; brightness++) {

      analogWrite(thisPin, brightness);

      delay(2);

    }

    // fade the LED on thisPin from brithstest to off:

    for (int brightness = 255; brightness >= 0; brightness--) {

      analogWrite(thisPin, brightness);

      delay(2);

    }

    // pause between LEDs:

    delay(100);

  }

}

將程式上傳後,很明顯的可以看到,PWM腳位和純數位腳位的亮燈差異,

https://www.arduino.cc/en/Tutorial/AnalogWriteMega

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