Introduction - If you have any usage issues, please Google them yourself
2 role in this indicator, the role is instructions 5V power supply, the role of instructions parallel level output, after the completion of the learning board did not disconnect the parallel cable, it will make a semi-bright instructions, if a short period of time to be frequently used learning board, turn off the power button. At this point, do not need to unplug the parallel and serial ports, semi-bright status LEDs will not affect the use of learning board.