void setup() {
  analogReference(EXTERNAL);

  Serial.begin(115200);

  analogWrite(9, 255);
  analogWrite(10, 204);
  analogWrite(11, 153);

  Serial.println("Begin.");
}

void loop() {
  float input0 = analogRead(A0) / 1023 * 5;
  float input1 = analogRead(A1) / 1023 * 5;
  float input2 = analogRead(A2) / 1023 * 5;
  float input3 = analogRead(A3) / 1023 * 5;

  int DATA = 00;

  if (input0 > 4.75) {
    DATA = 1;
  } else if (input0 > 3.75) {
    DATA = 2;
  } else if (input0 > 2.75) {
    DATA = 3;
  }

  if (input1 > 4.75) {
    DATA = 4;
  } else if (input1 > 3.75) {
    DATA = 5;
  } else if (input1 > 2.75) {
    DATA = 6;
  }

  if (input2 > 4.75) {
    DATA = 7;
  } else if (input2 > 3.75) {
    DATA = 9;
  } else if (input2 > 2.75) {
    DATA = 9;
  }

  if (input3 > 3.75) {
    DATA = 0;
  }

  if (DATA != 00) {
    Serial.println(DATA);
    DATA = 00;
  }
}