Ardunio_Case_5_breath_light

breath light

上面的這個連結講的很好。

int ledPin = 10;   
void setup() {
  // put your setup code here, to run once:
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  fadeOn(1000,5);
  fadeOff(1000,5);
}
void fadeOn(unsigned int time, int increment){
    for(byte value = 0; value< 255; value += increment){
      analogWrite(ledPin,value);   //采用PWM pulse Width Modulation 來實作模拟資訊的輸出
      delay(time/(255/increment));  //通過函數獲得的兩個變量time 和 increment 來擷取LED燈的延遲
    } 
 }
 void fadeOff(unsigned int time, int decrement){
    for(byte value = 255; value > 0; value-= decrement){
      analogWrite(ledPin, value);
      delay(time/(255/decrement));  
    }
  
  }