Many thanks, it's working now. 
I have one more little question : there's always a delay of 1-2 seconds between the order and the execution by the servo. I reduced the delays in the code but it makes little difference. Is there a way to fix this ?
Many thanks, it's working now.
I have one more little question : there's always a delay of 1-2 seconds between the order and the execution by the servo. I reduced the delays in the code but it makes little difference. Is there a way to fix this ?