Regarding stepper motor wih raspberry pi to press a button

Sensacell

Joined Jun 19, 2012
3,432
You do realize the operating system is constantly interrupting your code?

It's almost impossible to get a clean pulse train out of a Raspberry Pi if it's strictly software generated.
The multi-tasking OS is constantly stealing CPU cycles in an unpredictable way, in short, it's a total fail for any precision timing task.

Try this simple experiment:
Write the simplest program to output a square wave, set pin HI, Delay, set pin LOW Delay (repeat in loop).

Watch the horrible jittery mess that comes out with an oscilloscope.
 
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