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Keith-W
MemberDid you ever get an answer to this from some other source? I was planning on adding the same manual handles to mine but it is not a high priority. I could reference the schematics to see if there are diodes or shunt resistors but I think it might be more of a concern with the actual motors drivers and reverse current flow with them. I think home limit switches or sensors are probably a better solution ultimately though, and leave all motion to be initiated through software only.
MemberThe only other thing I can think of would be to use to use a DPDT relay on each motor output (for each coil pair). I doubt I’ll do this now but maybe a feature suggestion would be to have a some configurable inputs for functions like this.
MemberThe use of the key switch would enable/allow motion for all axis as an additional layer of safety. So yes, a lockout function. I did look at the schematics but didn’t notice that the enable was an output. There may not be another way to do this with this board since there is no dedicated input.
Since all logic on the board is powered by Vmot and not USB power that doesn’t appear to be an option either.
Looks like I may have to leave this feature out unless you or others have a suggestion.
Thanks for the reply!
MemberBump
Has anyone used the “enable” line with an external switch?
This doesn’t appear to be a very active forum … someone please prove me wrong
MemberI hope someone decides to make them available at some point. I’ve drawn mine already but it is duplicated effort any time anyone has to do this.
MemberI realize this thread is very old but I’d like to add to it anyway in hopes of getting a reply.
Regarding the exposed signals on headers for the four motors, would it be possible to use “enable” to bypass, override, or work in combination with the existing code? I was hoping to add a key switch that would enable the motors when allowed. If the processor ties the enable to ground in order to assert enable but already has a pullup, is there any reason why I can’t add another external pullup and the key switch without any processor code change? Also, does the existing code read the state of enable as well as write to it in order to see if the necessary state was reached?
MemberI know this suggestion/post is old, but I agree. The more complete and thorough project oriented will not just be screwing this board to a piece of wood. I always to use cases and with highly thought out front and back panels. Indicator lights are very important. In the days of through-hole components, this modification would be easy. Yep, a header would be great for these.
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