Setinterval blynk interfere the stepper motor accelstepper

@Celio_P_Silva I’d suggest that you begin a new topic, and start by posting as much relevant information about the project, it’s hardware and the code that you are running, otherwise it’s very difficult to try to help.

Assuming that you are running a board with a single processor core (which we don’t know, because you’ve not shared that information) then the processor can only do one thing at a time. For most projects, this is sufficient, as switching between tasks rapidly manages to “keep all the plates spinning at the same time”, which gives the impression of a multi-tasking/multi-threaded processing environment.

If your hardware/stepper controller requires constant attention from the processor of your MCU to keep it moving smoothly, and you set-up a timer that tells the MCU to go off and do something else for a while then your stepper won’t be getting the attention it needs to keep moving smoothly.

Blynk needs a lot of processor time to make the “Blynk magic” happen, so it’s quite fussy about timing. From my very limited experience of working with stepper motors, they are also very fussy about timing.
You can get the two working together well, provided you don’t want to control multiple steppers at the same time, but the code needs to be well written and efficient.
If you want more control, or simultaneous control of multiple steppers, then you’re probably going to needs to use multiple boards to achieve this. Take a look at this project to see what can be achieved using that approach:

Pete.