Give binary values to my arduino inputs

Other Hardware General Electronics
47

Your code could be as simple as this

const byte codePins[] = { A0, A1, A2, A3 };
const byte PINCOUNT = sizeof(codePins) / sizeof(codePins[0]);

void setup()
{
    Serial.begin(115200);
    for (int p = 0; p < PINCOUNT; p++)
    {
        pinMode(codePins[p], INPUT_PULLUP);
    }
}

void loop()
{
    byte codeByte = 0;
    for (int p = 0; p < PINCOUNT; p++)
    {
        bitWrite(codeByte, p, digitalRead(codePins[p]));
    }
    for (int p = 0; p < PINCOUNT; p++)
    {
        Serial.print(bitRead(codeByte, p));
    }
    Serial.println();
    delay(1000);
}

Once you have the value in the codeByte variable you can test it and take appropriate action