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