Interrupt Counter 30

Count encoder ticks and fast events with external interrupts.

/*
  Roboda verified Arduino sample 0737
  Feature: Interrupt Counter
  Generated for online build, classroom practice, and hardware upload testing.
*/

volatile unsigned long ticks = 0;

void onPulse() {
  ticks++;
}

void setup() {
  Serial.begin(9600);
  pinMode(2, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(2), onPulse, FALLING);
}

void loop() {
  noInterrupts();
  unsigned long copy = ticks;
  interrupts();
  Serial.println(copy);
  delay(255);
}

How it works

Practice this Arduino feature with a verified Roboda sketch.

1. Read the constants at the top of the sketch.
2. Wire the pins exactly as listed in the pin map.
3. Upload or compile once before changing values.
4. Change one value at a time and watch Serial Monitor or the output device.

Connections