ramp generator for stepper motors


Posted on Sep 1, 2012

The 555-based bistable circuit in Figure 1 can easily generate a pseudo-trapezoidal move profile. Note that the timing string of R1 and associated components does not connect to VCC, as it would in a normal circuit, but instead receives its power through a pushbutton switch.



When you push the button, capacitor C1 starts charging up to a point at which C2 can start charging. As C1 charges, the output frequency of the 555 starts off slowly and gradually increases to a frequency or pulse rate that`s a function of all the co




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