Arduino impulse counter

Question

I wanted to write fast impulse counting code for Arduino, to run at 100khz. I wanted to count fast square impulses from generator. I can’t find anything on the internet.

Answer 1

You can use interrupts. Read the documentation here

Example code:

const byte interruptPin = 2;
int count = 0;


void setup() {
  Serial.begin(115200);
  pinMode(interruptPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(interruptPin), pulse, RISING );
}

void loop() {
  if(count % 100000 < 10000)
  {
    Serial.println(count);
  }
}

void pulse() {
  count++;
}

Note: with such a fast input signal, speed is an issue. I'm not even sure the above code is fast enough, but at least you know which direction to go.