#include "SevSeg.h"

#define PULSE_PIN 4

SevSeg sevseg;
volatile uint32_t pulseCount = 0;
volatile uint32_t lastPulseTime = 0;

void IRAM_ATTR onPulse() {
  uint32_t now = millis();
  if (now - lastPulseTime > 50) {
    pulseCount++;
    lastPulseTime = now;
  }
}

void setup() {
  byte numDigits = 4;
  byte digitPins[] = {32, 33, 25, 26};
  byte segmentPins[] = {12, 13, 14, 27, 16, 17, 18, 255};
  sevseg.begin(COMMON_CATHODE, numDigits, digitPins, segmentPins, false, false, true);
  sevseg.setBrightness(90);
  pinMode(PULSE_PIN, INPUT);
  attachInterrupt(digitalPinToInterrupt(PULSE_PIN), onPulse, FALLING);
}

void loop() {
  sevseg.setNumber(pulseCount, 0);
  sevseg.refreshDisplay();
}