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Forum Index : Microcontroller and PC projects : Stepper motor

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kermess
Regular Member

Joined: 04/04/2013
Location: Spain
Posts: 45

Posted: 03:33am 05 Mar 2015

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Hi.
Leveraging there are people who dominate control MKII with CFUNCTION
I propose to make a CFUNCTION for controlling stepper motors
for example based on the "typical" 3D printer drivers
as are the A4988, DRV8825, ......
The idea would be a "Function" with parameters as direction, speed,
acceleration, deceleration, enable / disable, number of steps to move the motor, etc ...
a greeting.
It's an idea .....
kermess

StoveMan
Regular Member

Joined: 29/03/2013
Location: United States
Posts: 51

Posted: 02:40am 06 Mar 2015

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kermess,
yes! Inline stepper timing is far to slow in any interpreted language implementation.
I have used Terry Weeder's (www.weedtech.com) serial board with the Maxi to do what you are proposing. Perhaps a look at his command set will help.

The real payoff with a stepper function would be coordinated motion. I have tried by fooling with SPEED input parameters but the accuracy is abysmal. Some sort of a low level synch pulse between the cfunction call and pin manipulation?

IE: two steppers want to reach their commanded count at the same TIME; so multiple function calls would need to pile up until all pins would receive an EXECUTE command and start toggling on the same clock cycle.

Wish I was more help with the programming end though... good luck

viscomjim
Guru

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

Posted: 07:38am 06 Mar 2015

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I've been using this with the uMite and serial communications. They also have boards like this with stepper drivers also. I am using 4 of these with the above board to drive some steppers. This setup works very very well and lets the uMite handle other things too.

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