Using the mCore is straightforward. First, connect it to your computer via the on - board USB Type B connector. Then, use the Arduino and Makeblock Library to start programming. You can connect different sensors through the color - labelled RJ25 connectors. When doing so, match the colors to ensure correct wiring. As for expansion, you can connect more Arduino sensors to the RJ25 interfaces. When it comes to maintenance, keep the board clean and dry. Avoid exposing it to extreme temperatures or moisture. If an over - current situation occurs, don't panic. The resettable fuse will take care of it and reset the board to normal operation. Just make sure to check what caused the over - current and fix it to prevent future issues.