[Robert Coe]

Here is a link to info about the Easy Driver (Stepper motor driver board). You will be able to find links to vendors there too.      schmalzhaus.com/EasyDriver/index.html

 

[Robert Coe]

Thanks for your input.  The easy driver uses a stepper driver chip that has all the logic and drivers built in.

All it requires is input for step size, direction and a step pulse.

 

I’ve solved the ramping of step pulses by adding an RC circuit and a transistor between the timming resistors R1 of the astable 555 and Vcc, as the capacitor charges the transistor slowly turns on effectively ramping the frequency of the step pulses.

I bread boarded the circuit and it work perfectly. The stepper motor slowly ramped speed, to the preset speed, set by R1, of the astable circuit without locking into resonsnce.

 

[Robert Coe]

That is why I’m using the easy driver stepper motor driver.

Please read the question fully when replying.

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