Discussion Wii Power Management System (open source)

Discussion in 'Wii' started by Gman, Mar 16, 2019.

  1. The hob .

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    I made a report to the web-shop about the weird amperage.
     
  2. The hob .

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    I am going to buy a couple of boards (without components). The minimum quantity I can order is 10. Does someone also want a board. The price I am going to pay for one board is $1.40 International shipping is €1.45. I am not doing this to make money but just to get rid of boards I will never use.
     
  3. Notjohnny .

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    When you get the boards you could start a thread on the selling section, people interested will go there and open a pm so you make your deal
     
  4. The hob .

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    OK, I will do that.
     
  5. Gman RTFDS Staff Member . . . . .

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    For anyone interested in an assembled pcb, they will be for sale soon. I will give more details as it comes closer.
     
  6. DefaultLik .

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    [answer is no]

    Thanks for answering and sorry if this is something I should not have asked.

    PCB design/layout is definately an important aspect to it. I am not experienced, so this might be wrong:
    Is it easier to learn it by trial and horror error without going through some advanced courses, than designing the schematic (and how to use which component and such)?

    That was the part I was more curiose about. I just saw the "BQ25895M" that seems to be responsible for "battery charge management and system power path management" and "various safety features". In retrospect, it makes sense to use an IC for it and not hack something together that may or may not work.

    And now that I think about it, if the schematics are partally given, the PCB layout migth be harder, especially so because of the size constraint...
     
  7. Gman RTFDS Staff Member . . . . .

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    If you dive into pcb design with no idea, you are only going to struggle and waste money. Here are some good tips for buck regulator layout http://www.ti.com/lit/an/slyt614/slyt614.pdf
    http://rohmfs.rohm.com/en/products/...ng_regulator/converter_pcb_layout_appli-e.pdf
    Also start by studying the Electronics 101 videos https://bitbuilt.net/forums/index.php?threads/electronics-101-videos.1224/

    Please make a new thread for any more questions, this is not right thread.
     
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  8. Warguy64 .

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    Sorry for being a lazy person, but would this solution cost less than a bms and pth regulators?
    Also, isn't this like the powermii lite?
    EDIT: oops I'm stupid and should have read closer to other responses ignore this
     
  9. Gman RTFDS Staff Member . . . . .

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  10. Gman RTFDS Staff Member . . . . .

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    Just pushed a change to the github, set the TREG register on the BQ IC to limit the charge current when the junction temperature gets too hot. Please download the latest .hex before programming your own boards.
     
  11. Aurelio The Fixer ᕕ( ᐛ )ᕗ Staff Member . . . . .

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    Why did you set VINDPM to 15. 3V?
     
  12. Davve_DP .

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    Hey gman, does the PMS disconnect the batteries when you plug the charger in while playing?
    Also, how hard would it be to edit the code to allow the desired input to 5v. I’m considering this because I would like to hook up the PMS to a usb-c breakout.
    BR
     
  13. Gman RTFDS Staff Member . . . . .

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    It shoudnt disconnect the batteries no. You can already use 5-14V input.
     
  14. Ekterm .

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    Possibly stupid question, I only see one battery pad, how do you do a 2S setup?
    Edit: wait I just looked at the description in the store, are you only supposed to use 1S?

    Another question, why is 12v charging recommended over 5v?
     
    Last edited: Jun 5, 2019
  15. Aurelio The Fixer ᕕ( ᐛ )ᕗ Staff Member . . . . .

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    Yes, it's 1S only.
    12V is recommended because it can provide more power, since the charger ic input current is limited to 3.5A
     
  16. Davve_DP .

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    That’s great! That means I only need to get a usb-c breakout and a few pull-down resistors on the cc-lines and I should be able to lose the 2.1mm jack.

    If only my PMS could get shipped...
     
  17. Ekterm .

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  18. Gman RTFDS Staff Member . . . . .

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    I am presently building them right now and they will be in stock soon :)
     
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  19. The hob .

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    Can you use the BQ25895RTWRinstead of the BQ25895MRTWR
     
  20. Jerd .

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    Looking at the data sheets for both, it seems like they are interchangeable, so yes.
     

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