Hi everyone I’m really a beginner and here’s my problem
I have a arduino uno r3 the clone
I have the ch341 installed
And servomoteur the sg90
I used a example arduino program to try first
And the wires are correct
I even tried with different servomoteur and all of them doesn’t work
So if you’re see where is the problem tell me pls
I need your help as soon as possible
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Welcome to the forum.
Could you disconnect the servo motor ? Disconnect it completely.
Then try to blink the led at pin 13, then try to send a message to the Serial Monitor.
You forgot to specify what the problem is 
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