You have the reason @ScruffR but my problem was very estranged because there are not a issue on my code. I think that’s my fault, i was doing something wrong on my wiring, now it’s working.
Also, maybe a good this is a good thread to know if someone has been able to read the information of this type of servos (AX12) through the chips that indicate in this post:
I can do it with Raspberry PI and Arduino but doesn’t work with the Photon…