adding powerbank and external mic

Discussion in 'SJ7 Star' started by maak, Apr 17, 2018.

  1. maak

    maak New Member

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    ...and data transfer in one setup.

    never open your cameras waterproof house again ;)

    [​IMG]
     
    Last edited: Apr 19, 2018
  2. RBEmerson

    RBEmerson Humbled by events

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    To date, SJCam hasn't released a dual purpose cable. I think anyone who wants to use an external mic is more likely to want to use external power, too.

    Here is a video about how to make this cable.
     
  3. maak

    maak New Member

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    i just made one that does all three jobs.
    powerbank, external sound and transfers data.
    that video you link to is not good at all.
    i traced all pins with a Fluke and came up with different pins than video..
    the Fluke didn't lie, it works as a charm :)
     
  4. RBEmerson

    RBEmerson Humbled by events

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    Can you provide a drawing or video about how you made this cable?
     
  5. maak

    maak New Member

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    Hobbytronics has good price and fast delivery:
    http://www.hobbytronics.co.uk/cables-connectors/usb-connectors/usb-minib-plug-diy-10pin

    then what you need is a 7 core cable, thin enough to fit in this:
    [​IMG]
    a standard HDMI cable is perfect, it fits.
    just get rid of the 3 twisted pairs and only use the thin ones.
    solder operation is to first take out the pins and solder it all outside the connector.
    put them back in on right place and close it, a bit tricky so...

    alt. just solder as is or put something between the two pin-rows and then solder 1,2,3,5, 6
    and then 9 and 10. you can get rid of those not in use to get more room for errors.

    you also need a standard USB cable with 4 leaders, i cut my cable that came with the motorcycle housing.
    it had red/black/white/green.
    last you need your microphone with cable. mine had one copper and one metallic blue inner leader.
    they are coated so they won't lead unless you get rid of the coating with sandpaper e.g
    only stroke away from cable, it's very thin leaders and will break easy.

    [​IMG]

    1 = Vcc +5V (red)
    2 = data + (white)
    3 = data - (green)

    4 = not in use
    5 = GND (black)
    6 = PWM (connect pin 6 to GND (black) in splice)
    7 = not in use
    8 = not in use
    9 = GND (mic) copper leaders in this case
    10 = Signal (mic) blue thin leader in this case

    red is the powerbank, green is data transfer and blue is external microphone function.
    PWM makes cam turn off internal mic and enable external.
    if you get background noice them just switch leaders at pin 9 and 10 in splice and mic gets quiet.

    7 core cable goes from your cam to your splice, mine is 45 cm long.
    you splice the 7 core cable with your standard USB cable with 4 cores (red/black/white/green)
    [​IMG]
    and your microphone cable with 2 cores.
    [​IMG]

    red and black is power, white and green transfers data to your PC.
    use selfbounding tape or heatshrink over your splice to make it more resistant against rain.
    no soldering is needed for the splice, just shield each wires with transperant tape e.g

    if you find it hard to understand?
    then your standard USB cable dictates what is spliced against your 7 core leader.
    red must be spliced against a color in 7 core cable that ends on pin1 and so on...
    same goes for your mic, the mic cable dictates also.

    most important is the pinout, the rest is just gymnastics for the brain.

    .... and many roads leads to Rome ;)
     
    Last edited: May 2, 2018
    Phil Rosa-Leeke likes this.
  6. RBEmerson

    RBEmerson Humbled by events

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    WOW! Great thanks for your effort and help here.

    How did you identify which pin does what? If you're really bored and looking for something to do, there's some interest figuring out how to start the camera remotely. IIRC it might be that a lead needs to be pulsed, a contact stays closed, or only needs to be closed momentarily.
     
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  7. maak

    maak New Member

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    here is a picture of my mini USB connector after it was done.

    [​IMG]
    https://imgur.com/a/HHTIRHQ

    my pinout works 100% and this cable is very handy to have so... give it a try ;)
     
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  8. nianeko2

    nianeko2 Member

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    You corrected the pin out. So thread #3 should also be corrected.
     
  9. RBEmerson

    RBEmerson Humbled by events

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    @maak Fixed that for you... :)

    [​IMG]
     
  10. maak

    maak New Member

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    soldering the mini usb can be a pain in the a*s so an alternative is a mini usb (10 pin, not 5) to usb 3.0 in the other end..
    a 10 core cable which you cut and splice as you like, depending on what you like to build.
    use a DMM to make sure which pin is which.

    http://www.ventincre.com/Product Images/USB 3.0 Cable/USB 3.0 Male to Mini USB 3.0 Male Cable.jpg

    https://img.staticbg.com/images/oau...D/23/845d7277-acbc-44f1-9498-b1a7764dbee5.jpg

    if you gonna use it in fly fishing conditions, like i aim, you might fall in the water and short your powerbank.
    then you might consider putting a small fuse in your splice on the red leader.

    https://www.12voltplanet.co.uk/user/products/large/glass_holder_30-32mm_8A_1.jpg
     
  11. RBEmerson

    RBEmerson Humbled by events

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    OOOHHH! I like this idea! To be certain about this: buy the cable, leave the mini USB connector intact, and chop off the other end. From there, add connectors as appropriate.

    IIRC the SJ7 requires a jumper from pin 5 to pin 6. Obviously, using this cable scheme, the appropriate wires are tied together. End of problem. Did you test for whether this jumper is needed?

    Also, what pins are used for a standard USB connector to pass power back to the SJ7? The idea is to cut the cable far away from the USB 3.0 connector to let it connect to a battery pack using standard USB connections. The power leads at the micron connector would be reconnected to the USB 3.0 connector.
     
  12. maak

    maak New Member

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    use a standard USB cable, throw the 3.0 USB (PC side) in bin.
    but you need a standard USB which have both data and charger, some chepos have only charger.
    test cable on cam and you'll find out if it's good to go ;)

    red, white, green, black are standards and will end on right pins.
    thing is to check mini USB, which color comes from which pin.
    the rest is childs play
     
  13. RBEmerson

    RBEmerson Humbled by events

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    OK, got that. What about jumper between 5 and 6?
     
  14. maak

    maak New Member

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    well... a jumper between 5 and 6 in mini USB is hard to do in this case with pre-made cable ;)
    just connect these two in your splice, function is just like a jumper, but a long one.

    5 and 6 from mini USB + black from standard USB cable is one splice (3 ends).
    all other splices will be only one leader to another leader, minus those not in use.
     
  15. RBEmerson

    RBEmerson Humbled by events

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    I assumed tying the cables will work, but I'm wondering if the jumper needs to be done.
     
    Last edited: May 6, 2018
  16. Genuinearticle

    Genuinearticle New Member

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    any chance someone would like to sell a short, pre-made/ manufactured adapter?
    All i want to do is plug my iRig lav Mic into a female 3.5mm jack plugged that's connected to the SJ6 Legend.
    My iRig mic supports two microphones, so this way i can record two people interviews. I can't make heads-or-tails of these schematics and have no experience soldering wires
     
  17. Sulev Svilponis

    Sulev Svilponis Elite

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    It depends where you are located. I think there are no mass produced adapters for your needs. Custom built accessories are costly and shipping/handling will add some more extra costs.

    I doubt, that SJ6 can handle two separate mics. AFAIK it has only 1 pair of input contacts for external mic.
     
  18. Genuinearticle

    Genuinearticle New Member

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    I'm in Washington State, USA.
    Just looking for this:
     
  19. nianeko2

    nianeko2 Member

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    You use iRig Mic Lav, do you need to monitor mic sound ?
    SJ6 do not have audio out, so you can not monitor.
     
  20. Sulev Svilponis

    Sulev Svilponis Elite

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    Your mic is not a standard mic. It has TRRS type audio jack instead of regular TRS type jack. And supports two mics or mic+headphones (for monitoring), that is not supported by SJ6. So there must be slightly different solution than shown in your video sample, especially if you want additional connection for external power supply.
    Components for this adapter could be bought online for only few bucks, but without having this mic and the camera for testing, it might be difficult to achieve working solutions at once.
    Don't you have any electronics repair shops in your area, who are willing to solder few wires and components in form of instant service, if you provide all neccessary components? Or maybe somebody of your frends has soldering experiences - it is actually not so difficult.
     

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