Frequency counter Arduino

[gcjr]

@forgeddabout3356

Where I'm counting events (the state change of a button) with an ESP8266, and after a certain time (10 seconds in my testing code), the system prints and restarts the counter.

consider

const byte pinBut = A1;

byte          butState = HIGH;
unsigned long msecLst;

int           count;

// -----------------------------------------------------------------------------
void
loop (void)
{
    unsigned long msec = millis ();

#define Timeout 5000
    if ( (msec - msecLst) > Timeout)  {
        msecLst = msec;
        Serial.println (count);
        count = 0;
    }
    
    if (butState != digitalRead (pinBut))  {
        butState = ! butState;

        if (LOW == butState)
            count++;
    }
}

// -----------------------------------------------------------------------------
void
setup (void)
{
    Serial.begin (9600);

    pinMode (pinBut, INPUT_PULLUP);
}