IRIS jst connector to power FPV and Gimbal

Posted by William Chenoweth on September 2, 2014 at 6:03pm

I was wondering if I could splice power off the jst connector on the IRIS's belly to power the 3DR FPV.
https://store.3drobotics.com/products/3dr-fpv-osd-kit (power both of them from the one factory connector)

Or should I splice into the main power using something like this?

http://www.ebay.com/itm/261356759924?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Thanks in advance!

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Replies

    • SkyRover > William Chenoweth September 2, 2014 at 9:33pm

      after pulling out a blown iris esc i have heres the regulator for the jst plug.

      heres TIs info i found for it: http://www.ti.com.cn/cn/lit/ds/symlink/pth08080w.pdf

      I dont know what the combined amps would be of the two, but you can easily measure it, or find the info online

      20140902_222410.jpg

      20140902_222648.jpg

      http://www.ti.com.cn/cn/lit/ds/symlink/pth08080w.pdf
    • William Chenoweth > SkyRover September 3, 2014 at 8:34am

      This is exactly what I was trying to find for a hours.  THANK YOU!

      "The output voltage can be adjusted to any voltage

       over the range, 0.9 V to 5.5 V, overcurrent protection,

      and overtemperature protection."

      I am no electronics genius, but common sense tells me I need to step it down to a voltage that is in the transmitter specs.


      "Power Supply: DC 7-12 volts - Current Supply: 850mA"

      So it looks like the belly jst won't have enough juice. I don't think I will even try it.  I am just going to solder this directly to the main leads from the XT60 battery connector.


      I will send an update when the parts come in. Thank you very much Bryndang!

    • SkyRover > William Chenoweth September 3, 2014 at 9:44am

      I just looked at the wiring diagram because of your quoted piece there. The jst outputs 12v for my vtx. On the diagrams and in the pics the jst is soldered to the power in and ground. the third pin (the one above the jst ground in the second picture) is the voltage out. So it will definitely run your fpv gear. now that we know its not going through that TI switch the question of the amperage comes back up. But with it being printed on the board I would feel pretty confident in it being able to handle a 200mw vtx and the tarot gimbal.

    • SkyRover > SkyRover September 3, 2014 at 9:46am

      I just looked the two up, and your vtx at .85A and the gimbel at .5A gives less than an amp and a half. The wiring will be more than enough for that. Powering both of of the stock gimble plug wont be a problem.

    • William Chenoweth > SkyRover September 3, 2014 at 10:33am

      Awesome!  Thanks for the help dude! I will be asking for Paypal donations if it fries something. LOL

      I'll report back after I have a chance to test it. I am booked up tonight, but its going to bug me, so I will find 20 minutes for a quick flight!

    • William Chenoweth > William Chenoweth September 3, 2014 at 3:45pm

      LOL. I fried my power distribution board.  :(

      I am so pissed.  https://www.youtube.com/watch?v=Xohy5t5GPuA&feature=youtu.be

      I was having issues with the gimbal turning on, so I re-spliced the wire to it. negative and positive crossed for a split second and the whole thing went up in smoke.

      Ordering a new board.    FML

    • SkyRover > William Chenoweth September 3, 2014 at 4:14pm

      I had my iris crash in about 4 inches of water and one of the 4 escs on the board burned up. Its crazy how much of that magic blue smoke they pack into these things at the factory! if you pull that black heatsink off you'll see the 4 banks of electronics for each motor. Odds are one is gunna look not like the others.

      So it sounds like you had the board powered while soldering it?

    • John O'Shaughnessy > William Chenoweth September 3, 2014 at 3:53pm

      You built yourself a smoke machine!  I'm sorry to hear it.

      Maybe I'll go the filtered balance lead route...

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