You can check if you have any jumper wires plugged into pin 0 and 1. thoses pins are used for serial communication and plugged wires can can prevent the code from being uploaded on the board.
你可以检查，如果你有任何跳线插针0和1。一朵针用于串行通信和插线能防止代码上传在黑板上。
You can check if you have any jumper wires plugged into pin 0 and 1. thoses pins are used for serial communication and plugged wires can can prevent the code from being uploaded on the board.
你可以检查，如果你有任何跳线插针0和1。一朵针用于串行通信和插线能防止代码上传在黑板上。
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