ARDUINO LED 呼吸燈效果教學

接線圖

X1 Arduino Uno R3

X1 單色LED 

X1 220~10k Ω 電阻

LED燈需要接上電阻 避免電流過大燒壞

LED正極需插入有 PWM 功能之 pin腳(有~符號就是PWM)

有關PWM可參考這裡

Arduino IDE code

以下提供三種程式碼

第一種

int YellowLED = 6; //定義 pin6為 YellowLED

int intensity = 0; //定義 光強度為intensity

int rate = 5;      //定義 光強度的變化率

 

void setup()

{

pinMode(YellowLED,OUTPUT); //輸出

Serial.begin(9600); //開啟串列監視器

}

void loop()

{

analogWrite(YellowLED,intensity);

intensity = intensity + rate;

  if (intensity ==0){

  rate = 5;

  }

  if (intensity ==255){

    rate=-5;

  delay(30);

  }

Serial.println(intensity);

delay(1000);

}

第二種

int ledPin = 6;

void setup() {

  // initialize ledPin (pin 6) as an output.

  pinMode(ledPin, OUTPUT);

}

// the loop function runs over and over again forever

void loop() {

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

    analogWrite(ledPin, brightness);

    delay(10);

  }

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

    analogWrite(ledPin, brightness);

    delay(10);

  }

}

第三種 Arduino IDE 內建的 fading

int led = 6;         // the PWM pin the LED is attached to

int brightness = 0;  // how bright the LED is

int fadeAmount = 5;  // how many points to fade the LED by

// the setup routine runs once when you press reset:

void setup() {

  // declare pin 6 to be an output:

  pinMode(led, OUTPUT);

}

// the loop routine runs over and over again forever:

void loop() {

  // set the brightness of pin 9:

  analogWrite(led, brightness);

  // change the brightness for next time through the loop:

  brightness = brightness + fadeAmount;

  // reverse the direction of the fading at the ends of the fade:

  if (brightness <= 0 || brightness >= 200) {

    fadeAmount = -fadeAmount;

  }

  // wait for 30 milliseconds to see the dimming effect

  delay(30);

}