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  • A cold start of any GPS requires that current ephemerids have been downloaded to the local GPS receiver. Each satellite sends its own ephemerids. The ephemerids contain the coefficients that allow the receiver to determine the satellite position. Ephemerids are transmitted with the coded L1 signal at 50 baud.

    All this means is that a cold start GPS may take 10-12 minutes to download a complete set of ephemerids. IF the satellites are visible.

    The Iris's Pixhawk and GPS can function and communicate find with the the 5v USB connection. Take the Iris and a laptop outside, plug the Iris into the laptop, open and connect to Mission Planer and observe the GPS.

    The PDOP (position dilution of precision) value is what is used to determine if the position solution is good enough for flight. Lower is better. Going from memory, the stock value is 3.0.

    Think of PDOP as the inverse of the volume of a pyramid described between your position and each satellite. The complete sky would be 1. A view of the sky blocked by trees, buildings, or mountains will reduce the volume available.

    Coeur d'Alene has a couple little hills around. You may have to move to Wyoming. Kidding, I'm in West Virginia, the PDOP limit can really hurt flying in and around our hills and trees, so I've modified the stock parameter. But wait until you gain some flight experience before modifying.

    * Spelling and grammar, though well intentioned, may have been inadvertently assisted by my iPhone while enjoying some great Bluegrass at MerleFest in 70 degree sun and a light breeze.
  • @Adam Calkins

    Well it has to be green before you can fly it. Are you getting yellow blinking led while you wait. If so sounds like it is trying to locate a satellite. You know once you plug in the battery dont touch it, don't evem close the battery door.
  • I don't know if any of you will be able to help.  I recently purchased an Iris+ and getting the UAV to start has been a real issue.  I follow the directions exactly to start the drone; turn on the controller, plug in the battery, and don't touch for 10 seconds.  Every time I do this I get the yellow error lights.  If I wait patiently for maybe 30-40 minutes it might turn to green so I can fly it.  But then when I need to change batteries, this happens all over again.  Yesterday I updated the firmware in mission planner did the compass calibration in hopes of fixing the problem, it is still doing the same thing.  Any tips on what might be the problem and what I can do to fix it?  

  • I'm trying my maiden flight. I get a low battery alarm on the IRIS+ (Lights and beeping)  The controller reads voltage of 7.5 volts.  My Venom LOW Voltage alarm reads 12.5 volts with each cell balanced in the 4.17-4.18 range.  I'm hoping someone can give me some suggestion on how to troubleshoot this issue.  I've bought the entire IRIS+ package, but can't get off the ground.    Thanks in advance!   Dave 
  • I created a SOLO group to discuss the new 3DR SOLO being released on April 13, 2015.


  • Seeking a partner to incorporate drones shop in Colombia
  • Iris owners, this is the COMMENT wall.  If you need to ask questions, click on "Forums" at the top of the page.

  • Sorry members, just sent intended discussion thread as message...format is not designed for clarity!

  • see like i said i dont what the hell im doing with these forums. alot of confusion if u ask me

  • Richard - you posted your question on the "Comment Wall".  I think you want to start a post in the Discussions (ie. the forums).  You are more likely to get a reply there.  If you scroll down, you will see other people have done the same.  Personally, I'm not really sure what the point of this Comment Wall is ;-)

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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