serialdata.c

int d1 = 1, d2 = 2;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.print(d1);
  Serial.print(" ");
  Serial.print(d2);
  Serial.println(" ");
  delay(20);
}