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
