Using external 5v for Duet 3? (and powering the SBC from duet)



  • 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



  • @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



  • 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?





  • 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?

    a673fea4-8bda-4a5a-9ffd-f2a04ac21abe-image.png

    Correct?



  • 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]



  • 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)



  • 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.


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