Using external 5v for Duet 3? (and powering the SBC from duet)
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If I want the duet to receive 5v power from the PSU and to power the SMC, would it be correct to leave [5V->SBC] jumped but not the other 2?
I also wonder if it exist any specific reason why it would be better to use the internal 5V or power the 5V with the [ext_5v +5V] pin?
It makes it easier for me to wire in a on/off switch on the [+5 V standby] cable and then control the rest of the PSU with M80/M81 commands
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@Axel-H said in Using external 5v for Duet 3? (and powering the SBC from duet):
would it be correct to leave [5V->SBC] jumped but not the other 2
no the docs had a typo which should be fixed now. basically move the int_5v jumper to SBC->5v and you're good.
edit. i.e. both 5v->SBC and SBC -> 5v should be jumpered, and not int_5v
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When I got the card it had [5v->SBC] and [int_5v] jumped.
having both [5v->SBC] and [SBC -> 5v] jumped at the same time seems counterproductive?
or is SBC in those cases actually referring to the [ext_5v +5V] pin?It seem to work as it should with the SBC when I only have the [SBC -> 5v] jumped.
The way I understand it from the documentation is that the [5v->SBC] and [SBC -> 5v] change if the 5v pin on the flat cable is an output or an input pin?
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I do lack the knowledge or the experience to actually read something like that but form what I can see I guess you wanted to point out something like this:
So the [SBC -> 5v] are catastrophically mislabeled?
and it is allot better to just use the internal 5v?
Correct?
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Maybe I should note but I am not trying to power the duet 5v from the SBC so I do still fail to see why I should connect [JP5]
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I'm sorry, when you wrote you wanted the duet to receive 5v I assumed from the SBC.
If you apply 5v_ext you only need JP4. (to supply the SBC from the Duet)
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np
Thanks that was what I wanted to know.
as the page on cabling didn't say anything on powering the duet 5v from [5v_ext] so I wanted to check before I started to run the machine for any longer time.