         SerialUSB.write("Invalid input\r\n");
     }
   }
-}
+}

        sendOp(B1001, 0x0000);
        break;
      case '3':
        break;
      case '4':
        break;
      case '5':
        break;

      // Wait atleast 40ns (P5A)
      delayMicroseconds(1);
      SerialUSB.write("Sent 4 command bits and 8 data payload bits\r\nResponse: ");
      SerialUSB.print(String(response, HEX)+"\r\n");
      
      return response;
    } else {
