按键消抖——消抖中的消抖_From UU

基于“传统消抖不稳定，delay延时带来的不便”的更新算法：

byte LED = 13;
byte BUTTON = 3;
void setup(void)
{
  pinMode(LED,OUTPUT);
  pinMode(BUTTON,INPUT_PULLUP);
  digitalWrite(LED,LOW);
}
void loop(void)
{
  static unsigned long timepoint = millis();
  static byte count = 0;
  if(millis()-timepoint > 10)
  {
    timepoint = millis();
    if(digitalRead(BUTTON)) count = 0;
    if( (count<100) && (++count==10) )
      digitalWrite(LED, digitalRead(LED)^1);
  }
}
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下来我们来理解下上边的程序：

byte LED = 13;
byte BUTTON = 3;
void setup(void)
{
  pinMode(LED,OUTPUT);
  pinMode(BUTTON,INPUT_PULLUP);
  digitalWrite(LED,LOW);
}
void loop(void)
{
  static unsigned long timepoint = millis();
  static byte count = 0;
  if(millis()-timepoint > 10)
  {
    timepoint = millis();
    if(digitalRead(BUTTON)) count = 0;
    else if( (count<100) && (++count==5) )
      digitalWrite(LED, digitalRead(LED)^1);
  }
}
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或者 这个一样的：

byte LED = 13;
byte BUTTON = 3;
void setup(void)
{
  pinMode(LED,OUTPUT);
  pinMode(BUTTON,INPUT_PULLUP);
  digitalWrite(LED,LOW);
}
void loop(void)
{
  static unsigned long timepoint = millis();
  static byte count = 0;

  if(millis()-timepoint > 10U)
  {
    timepoint = millis();
    switch(digitalRead(BUTTON))
    {
    case 1:
      count = 0;
      break;
    case 0:
      {
        if( (count<100) && (++count==5) )
          digitalWrite(LED,digitalRead(LED)^1);
      }
      break;
    }
  }
}
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Note: 源于悠悠大神的智慧算法，转载需注明出处！


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