/*
https://electronics.stackexchange.com/questions/464324/counting-pulses-using-arduino-uno
I am trying to count pulses from a waveform generator using an Arduino Uno. The waveform generator is set at the following settings:

Waveform Type: Pulse
Freq: 20 Hz (50ms)
Amplitude: 3.0 Vpp
Offset: 0V
Width = 5ms
So far I get only 0s displayed on my serial monitor.

Here is what I have tried so far:

1) Using pulseIn() and pulseInLong() --> no success

2) Check wiring connections --> Used multimeter to check and they are properly connected.

3) Hookup an oscilloscope to see if the waveform is being generated --> The waveform is being generated as shown in pictures below.

Note: The waveform generator is part of the oscilloscope:

Waveform Generator

Connection Diagram

My code is shown below:*/

volatile int IRQcount;
int pin = 14;
int pin_irq = 14; //IRQ that matches to pin 2
int result = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin (115200);
  pinMode(14, INPUT_PULLUP);
  attachInterrupt(pin_irq, IRQcounter, FALLING);
}

void IRQcounter() {
  IRQcount++;
}

void loop() {
  // put your main code here, to run repeatedly:

  cli();// nointerrupt disable 
  IRQcount = 0;
  sei();// interrupts enable

  delay(100);

  cli();// nointerrupts
  result = IRQcount;
  sei();// interrupts

  Serial.print("Counted = ");
  Serial.println(result);
}