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[PCB Prototype] Arduino uploader code failed?

The program was successfully compiled but failed to upload. At first I choose COM1, but later after I change to COM3 still failed. Nothing happens when connected to the computer.The yellow light ...
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[PCB Prototype] Arduino uploader code failed?

The program was successfully compiled but failed to upload. At first I choose COM1, but later after I change to COM3 still failed. Nothing happens when connected to the computer.The yellow light ...
1answers

[PCB Prototype] Arduino project---some questions about relay

I am learning relay recently and made this project.The line and the parameters were correct. But after the power it will turned on and off at an extremely fast rate, completely out of control, what is...
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