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[Serge]

Hello, I'm sorry for all his question, I'm not very good at programming. I think the program you gave me above corresponds perfectly to my request. Only I will wish to test. I tried with GTX but it does not work. How to perform was IO4_Pin? Then, when connecting, I would like to know on which inputs must be connected to the programming work? Thank you for your attention.
Bests regards

[ESPsupport]

Yeah, that program would be impossible to test with GTX.

What you need to do is take a wire off the IO4_PIN (See the datasheet for how to find it, of course it is also written on the board overlay).

Connect that wire to gnd for one image and 3.3v for the other image, both those 'signals' can be found on the same header as the above

[Serge]

Great, thank you very much for your help which was very helpful. I'll try that, but normally it should work as it should. I will keep you informed of developments in my project.

Best regards.