int receive_pin = 2;

#define MAX 120
int value[MAX];
unsigned long time[MAX];
int changes;
int printed;

void setup() {
    Serial.begin(9600);
    pinMode(receive_pin, INPUT);

    changes = 0;
    printed = 0;
    attachInterrupt(0, change_handler, CHANGE);
    Serial.println("Receiver 433MHz setup");
}

void change_handler()
{
    if (changes >= MAX) return;
    value[changes] = digitalRead(receive_pin);
    time[changes] = micros();
    changes++;
}

void loop() {
  if (printed + 1 < changes) {
      Serial.println(time[printed+1] - time[printed]);
      printed++;
  }
}