arduino.ino

int buttonPin1 = 8;
int buttonPin2 = 13;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  
  pinMode(buttonPin1, INPUT);
  pinMode(buttonPin2, INPUT);
  
  digitalWrite(buttonPin1, 1);
  digitalWrite(buttonPin2, 1);
}

void loop() {
  // put your main code here, to run repeatedly:
  int button8 = digitalRead(buttonPin1);
  int button13 = digitalRead(buttonPin2);
  if (button8 == 0) {
    Serial.write(1);
    Serial.flush();
    delay(20);
  }
  if (button13 == 0) {
    Serial.write(2);
    Serial.flush();
    delay(20);
  }
}