Counting pulses and using them

Projects Programming
16

Try this sketch with a pushbutton between GND and pin 4, press the button x number of times, if you pause for 1.5 seconds, the onboard led will flash as many times as you pressed.

uint32_t tStart, timeStart, tEnd = 1500;
const byte dbTime = 25, btn = 4, ledPin = 13;
bool btnState = false, bState = true, oldBstate = true,
     timing = false;
byte cntr;

void setup()
{
  Serial.begin(9600);
  pinMode(btn, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);
}
void loop()
{
// debounce-----------------------------
  if (digitalRead(btn) != btnState) // they are different!
  {
    btnState ^= 1;                  // make them equal
    timeStart = millis();           // restart timer
  }
  if (millis() - timeStart > dbTime)  // if not changed for dbTime,
     bState = btnState; // btnState is valid, use it
// end debounce-------------------------
  
  if(!timing && !bState && oldBstate)
  {
    tStart = millis();
    timing = true;
  }
  if(timing && !bState && oldBstate)
  {
    cntr++;
    tStart = millis();
    oldBstate = bState;
  }
  if(millis() - tStart > tEnd)
  {
    timing = false;    
    while(cntr > 0)
    {
      digitalWrite(ledPin,HIGH);
      delay(500);
      digitalWrite(ledPin,LOW);
      delay(500);
      cntr --; 
    }
  }
  oldBstate = bState;
}