void setup(void)
{
    pinMode(A0, OUTPUT);           // veya pinMode(14, OUTPUT);
    pinMode(A1, INPUT_PULLUP);     // veya pinMode(15, INPUT_PULLUP);
}

void loop(void)
{
    if(digitalRead(A1) == 0)
    {
        digitalWrite(A0, HIGH);
    }
    else
    {
        digitalWrite(A0, LOW);
    }
}