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#define LOG_PERIOD 60000
#define GEIGER_PIN 4
unsigned long counts;
unsigned long previousMillis;

ICACHE_RAM_ATTR void impulse() {
  counts++;
}

void setup() {
  counts = 0;
  Serial.begin(9600);
  pinMode(GEIGER_PIN, INPUT);
  attachInterrupt(digitalPinToInterrupt(GEIGER_PIN), impulse, FALLING); //define external interrupts
  Serial.println("Start counter");

}

void loop() {
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis > LOG_PERIOD) {
    previousMillis = currentMillis;
    Serial.println(counts);
    counts = 0;
  }
}