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  • Thanks, Mike.  I solved my problem.  The repair was fine after all.  Turns out I had dropped the transmitter after the crash and it loosened the connectors for the left stick (throttle and yaw) so Pixhawk just wasn't seeing the signal to even try to arm.  Wasted a lot of time going back to look inside of Iris for issues and it was the darned transmitter.  Murphy's law is still in effect...

  • Hi Ray,

    You should be able to arm with your ESC disconnected. The communication between the pixhawk and the esc is pwm which is one directional and gives no feedback. 

    Are you getting any pre-arm messages on your HUD over telemetry? Also, if the pixhawk powers up and your not getting any error messages or beeps, it may be your RC link, the command to arm may not be getting through. Check this in radio settings in mission planner. 

    Hope this helps.


  • Mike, so your Iris+ still arms and runs 3 motors with the smoked FETs?  I guess that kills my theory about my problem (see thread above) after similar crash.  For some reason after crash and arm replacement my Pixhawk doesn't seem to be talking to the ESC at all.  Won't even give the failed-to-arm sound or go into ESC cal mode.  Everything on my Iris seems to work... except the propellers.

  • Does anyone know what FET is on the IRIS ESC? I have one motor down, looks like 2 FET's up in smoke :( This comes after I soldered a motor lead to the board, I think there may have been excessive heat causing a short maybe. Reading the case I can see Ior p3226 HTZ6_ F8736 but I cannot find this mosfet anywhere? 



  • @ Gregg, Yes there's a classified section and it's here:


    If you use Facebook you might consider joining the IRIS group there.  It's a pretty active community with 3500 members or so.



  • I  on my 2nd Iris+  and now am having a very hith HDOP when i fly around a tree in an fairly open field. Im looked at the logs and it seems like its droping sats as well. Anyone else have this issue and is there anyway to boost the pull of the gps! Like getting a-Ublox NEO-M8N GPS Module? Would this even work with the Iris and has anyone attempted to swap out the gps module with one and tested it?  I get near a tree and it goes all over the place. The only way i can control it is by switching to stb mode.  I need to fly near trees and some 3 story buildings and it doesnt seem to like doing it.  Any advice is appreciated.  Thanks

  • Hi, Any help to trigger Canon s100 using pixhawk with distance, I try and see all videos and Can't trigger. I am using a usb cable solder to Efla cable.

    thanks for your help

  • Thank you Phelps!

  • Damir,

    You want to check that the LED in leg is still working before you put it all together again.  When an arm is broken it can stress the LED cable.  If it needs replacing, you want to do that when you are replacing the arm.  It definitely requires soldering skills.  You can buy new LEDs at SUPERBRIGHTLEDS.COM.

  • okay thank you! 

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"OLD" IRS+ am I out of luck for parts?

Hello,I bought an Iris+ with the gimbal, Black Pearl FPV and a GoPro in 2015 and used it to take a video of my farm.--After the initial activity in 2015 (my first experience with a drone), I was busy with other things, so the drone sat on a shelf (in it's case).In 2017 I brought out the IRIS+ again, and discovered online that 3DR was out of business-- and I could no longer get parts--so I thought I was just totally out of luck with this drone and put it back in the box.2022:  I got out the…

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1 Reply · Reply by John Molnar May 21, 2022

bad crash last Saturday - can someone here read logs and analyze ?

well today just wasn't my day.I wanted to video some today of a lake near here that is soon to be refilled after the dam was replaced for the 2nd time. I preflighted my IRIS+ and even flew it around the yard some, it operated flawlessly. so i got ready and went to the lake. I put in my battery, waited for the IRIS+ to give the green light.i took off, flew around the perimeter of the lake some, and then headed offshore ( no water yet, just the streams ) i get about half way over the lake and…

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13 Replies

Iris + won't arm

I have an Iris + using a Spektrum satellite and DX9 radio. I can only get the Iris to arm and motors run when the Iris is connected to my computer via USB (plus with LIPO plugged in of course).If I go through this procedure without the USB cable attached, The Iris will initialize, LED will blink green, safely button pushed, stick right down on radio, LED changes to yellow and alarm goes off. It will also turn from blinking green to yellow without attempting to arm if I just leave if for a short…

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2 Replies

Iris+ Tarot gimbal camera compatibility

Took Iris out for some flights yesterday and still flies great.  But the USB port on my GoPro 4 Silver seems to have failed for charging and data transfer... but strangely still worked for Iris+ FPV.  So the battery is dying and who knows how long the FPV will function even if I get an external battery charger.Question: are there any other cams that are compatible with the Iris/Tarot setup?  I am reluctant to get another GoPro 3 or 4 since they seem to have fragile USB ports... and I don't…

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4 Replies