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  1. #1
    I have a 10amp din rail 5v PSU I want to power a Pi 5 which wants 5amps over USB C and a few other things I want to also power, USB hub and maybe some fans but never more than 75% load

    But the USB-C pinout has got me confused

    Click image for larger version. 

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    Do I need to run live to all 4 power pins and gnd to all 4 ground pins to supply 5amp?

    I assume this is wired in parallel right??? So they can use a smaller gauge cable

    And I reading this right?

    Thanks
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  2. #2
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 3 Days Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 2,908. Received thanks 360 times, giving thanks to others 8 times.
    It's not that simple.
    USB-C uses communication between the power supply and the device to establish the power supplies capabilities, and without that communication, the device will assume it's only being powered from a basic 5V supply.

    The Pi5 documentation covers what the Pi5 expects - https://www.raspberrypi.com/document...raspberry-pi-5

    However I'm surprised there's no mention about powering it via the GPIO header, and my initial search hasn't revealed any mention on whether you could simply connect 5V to the GPIO?
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  3. #3
    You can turn PD ID off in software on the PI and it will supply the 5amp

    As long as I wire it right

    On the PI forums they were trying to tell me that made a 3amp cable 5amp

    I told them gauge doesn't change but I think they don't get it's wired in parallel to supply the power feeds if I read it right

    but I bought a decoy board from alixpress in case but I shouldn't need it

    Was like $1
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  4. #4
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 3 Days Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 2,908. Received thanks 360 times, giving thanks to others 8 times.
    If this is for something embedded, I'd just wire it to the GPIO, if that's still a valid option on the 5.

    Saves having to handle wiring to 8 separate pins on the USB-C connector.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  5. #5
    Quote Originally Posted by m_c View Post
    If this is for something embedded, I'd just wire it to the GPIO, if that's still a valid option on the 5.

    Saves having to handle wiring to 8 separate pins on the USB-C connector.
    It can't supply the full 5 amp unfortunately
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  6. #6
    Quote Originally Posted by m_c View Post
    It's not that simple.
    USB-C uses communication between the power supply and the device to establish the power supplies capabilities, and without that communication, the device will assume it's only being powered from a basic 5V supply.

    The Pi5 documentation covers what the Pi5 expects - https://www.raspberrypi.com/document...raspberry-pi-5

    However I'm surprised there's no mention about powering it via the GPIO header, and my initial search hasn't revealed any mention on whether you could simply connect 5V to the GPIO?
    This is my solution for now

    We shall see if it works

    I bought a 100w USB cable (Really 25w for 5v)

    Going to cut it up route all the 4 lives to the live on the 5v PSU and all the 4 gnds to the gnd on 5v PSU and see what happens......

    Or get one of these which I think might do it, I assume the solder pads are power in

    https://www.aliexpress.com/item/1005005787738126.html
    Last edited by Desertboy; 11-01-2024 at 05:41 PM.
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

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