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Forum Index : Microcontroller and PC projects : step and direction generator

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viscomjim
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Joined: 08/01/2014
Location: United States
Posts: 925

Posted: 02:58pm 23 Mar 2014

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Hi all,

Working on a project that uses very simple motion control, only 1 axis. The idea is to position a belt driven linear actuator. Instead of using a stepper motor, I am using a closed loop servo controller that accepts step and direction signals just like a stepper amp would, but it uses an encoder on shaft to close the feedback loop. As far as the micromite is concerned, its just a stepper amp and motor. I have attached the micromite to the amp using 2 digital pins (step and direction). I set the direction pin high or low and then pulse the step pin for how many "steps" I want the unit to travel. This is all working very well, except for I need to somehow introduce very simple acceleration and deceleration to my step pulse stream. By just starting and stopping at full step rate, I get very hard starts and stops. This system is very simple for what is needed as I don't need anything crazy as far as motion profiling, just start from 0, accelerate to x speed, do x speed for certain distance, decelerate to 0 when approaching target, stop at target. The max speed will never change, just moving actuator to a position. Has anyone ever tried to implement simple accel, decel when using a stepper motor and MMbasic?

Thanks again!!!

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