Nardeus2K
Posts: 6
Joined: Wed May 30, 2018 11:31 am

Re: Gertbot

Fri Jun 08, 2018 12:38 pm

Hello,

First of all, thanks a lot about your quick response. I'm sorry I haven't had much time to either test it or come back to you on my tests.
I must confess I'm still not quite familiar with the parameters speed, ramp and flags, especially the last one, in servo_config(board,channel,speed,ramp,flags,trim_min,trim_max).
Speed and ramp must be specified how so?
As for the rest I'm assured the command lines are well designed.

Thanks a lot for your time.

User avatar
Gert van Loo
Posts: 2474
Joined: Tue Aug 02, 2011 7:27 am
Contact: Website

Re: Gertbot

Fri Jun 08, 2018 12:54 pm

I am working on an updated manual. There is a delay because I am switching from word to open-office and there are
compatibility issues. I have to do a lot of tedious work and I can stand only so many hours a week with elevated blood pressure!

The new manual states that you should just set the speed and ramp to zero.
Only use them if you find you have some issues with the motion.

Flags does nothing. It is for a feature which is not there yet.

I would appreciate any feedback on the drivers.
If I hear that they work, I can move them from alpha-status to release-status.

Nardeus2K
Posts: 6
Joined: Wed May 30, 2018 11:31 am

Re: Gertbot

Fri Jun 08, 2018 1:31 pm

Hi,
Using the following commands, I observe no movement, nor locking of the servo:
gb.servo_config(BOARD,0,0,0,0,1000,2000)
gb.servo_pos(BOARD,0,500)

tell me if there's any issues with my writing of the lines.

Thanks a lot for your time.

Nardeus2K
Posts: 6
Joined: Wed May 30, 2018 11:31 am

Re: Gertbot

Thu Jun 14, 2018 9:12 am

To make sure I didn't mess up in my wiring I include here my photo of wiring https://ibb.co/hpxaed

Please tell me as soon as you have some time for it if there's anything wrong with my side of things.

Thanks a lot

Nardeus2K
Posts: 6
Joined: Wed May 30, 2018 11:31 am

Re: Gertbot

Mon Jun 18, 2018 2:34 pm

Hello,

You do not need to further concern yourself using the servos, I've been told, it's a pointless ordeal using your board trying to control using your pins, as there are some left when plugging in your board. We just set some of the pins to GPIO and use PWM control fromthe GPIO toolbox on Python.

Thanks again for your time, and if I've ever incomodated you with a dumb question I'm sorry.

cbear92
Posts: 1
Joined: Sun Sep 09, 2018 10:47 pm

Re: Gertbot

Sun Sep 09, 2018 10:55 pm

Hi Gert,

I was hoping to get some advice about the features of the Gertbot? I am looking for some stepper motor control as part of my PhD. Part of that is using a ramped data, which is a list of different frequencies steps that all together represent a particular velocity/accel. profile. Is there a way to feed in this data and have the motor run unninterrupted? Or would this have to be coded to recognise when the current steps have been finished before sending out the next line to be run? If this is the case, would this be limited to the 1 ms read steps timing and what would the deadtime between lines end up being?

I was also wondering if the Gertbot could run lower power stepper motors < 8 V?

Cheers,
Cbear92

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