Matt Johnson
  • Male
  • San Antonio, TX
  • United States
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Matt Johnson's Discussions

DJI Datalink 900mhz with 3DR or RFD900...

Started Jan 8, 2016 0 Replies

Has anyone heard of using the DJI Datalink 900mhz radio to link up to a 3DR (or RFD 900) radio on the vehicle?I cannot figure out the settings for the DJI (net id, etc) and am not able to connect to…Continue

Drone Inspection on Live Power Transmission Wires...

Started this discussion. Last reply by Matt Johnson Dec 19, 2015. 3 Replies

Has anyone flown live power transmission wires? I have a potential job doing just that. The wires are energized at 138k volts. I was told that there is risk of interference from these lines affecting…Continue

Buyers Beware... DJI Professional Line Series Support and Policies...

Started this discussion. Last reply by Darko Car Jul 1. 2 Replies

Just wanted to share my situation with professional business users considering purchasing DJI...Less than three months ago I invested over $15k in a fully loaded spreading wing series setup with…Continue

Wiring order on RCtimer Gimbal Motors???

Started Nov 5, 2015 0 Replies

I just bought the RCTimer ASP 3-Axis NEX-GH5 gimbal and the motors have three wire solder points but they are not marked as to which one is the signal. Do I wire the signal on the right or left…Continue

 

Matt Johnson's Page

Latest Activity

Darko Car replied to Matt Johnson's discussion Buyers Beware... DJI Professional Line Series Support and Policies...
"Hello Matt, I am still using A2 and Wookong with LK900 and PC Ground Station. Everything is still working. The only thing I've done about that is that all updates to my flying equipment are dissabled. The problem that I have now is that LK900…"
Jul 1
Jimmy Underhill replied to Matt Johnson's discussion Error pos vert variance? What does it mean?
"The horizontal and vertical position variance errors are thrown when the EKF and GPS or other sensors do not agree. The most common time when this error is thrown is when flying in moderate to strong wind with a pitot tube. Adjust the parameter…"
Jun 14, 2016
Euan Ramsay replied to Matt Johnson's discussion Error pos vert variance? What does it mean?
"Did you ever find out what this was? I get it quite a lot, and the craft is pretty twitchy all the time. How do I turn off *all* the EKF stuff? (I'm on 3.4rc1)."
Jun 4, 2016
Euan Ramsay replied to Matt Johnson's discussion Error pos vert variance? What does it mean?
"I have this message too...did yours also come with "twitches" on althold / poshold as well?How did you turn it off btw - which parameters did you set?"
Jun 2, 2016
Anthony Verloop replied to Matt Johnson's discussion Error pos vert variance? What does it mean?
"I found the solution. Switch off EKF and, for the latest arduplane, switch of EKF #2 as well. I also switch off using compass. It's actually not the correct way, but it's the only way I have peace on my screen."
Mar 2, 2016

MR60
Hugues replied to Matt Johnson's discussion Error pos vert variance? What does it mean?
"Welcome to the club of unknown, unexplained EKF variance errors. I got myself in the last arduplane flight : EKF velocity variance error and another EKF position (horiz) variance error. No clue where to look at. So it seems we are severely lacking…"
Mar 1, 2016
Pierre replied to Matt Johnson's discussion Error pos vert variance? What does it mean?
"Had the some problem with error compass variance still havent fixed. How did it go for you guys?"
Mar 1, 2016
Matt Johnson posted a discussion

DJI Datalink 900mhz with 3DR or RFD900...

Has anyone heard of using the DJI Datalink 900mhz radio to link up to a 3DR (or RFD 900) radio on the vehicle?I cannot figure out the settings for the DJI (net id, etc) and am not able to connect to it on the COM port through mission planners config utility so I have not even been able to get very far, but I am sure someone out there has tried this...Thanks.MattSee More
Jan 8, 2016
Matt Johnson replied to Matt Johnson's discussion Drone Inspection on Live Power Transmission Wires...
"With as many drone companies that advertise doing power line inspections I am surprised there is not more out there that I can find on this issue..."
Dec 19, 2015
mark whitton replied to Matt Johnson's discussion Drone Inspection on Live Power Transmission Wires...
"I would think the transmission lines will interfere with the compass due to their magnetic field.  If this happens, you may want to find out how to disable the compass."
Dec 19, 2015
Ivan R replied to Matt Johnson's discussion Drone Inspection on Live Power Transmission Wires...
"i once had a GPS glitch flying oh about 20m above high power lines, but thats about it, no other issues and that was really an isolated incident"
Dec 19, 2015
Matt Johnson posted a discussion

Drone Inspection on Live Power Transmission Wires...

Has anyone flown live power transmission wires? I have a potential job doing just that. The wires are energized at 138k volts. I was told that there is risk of interference from these lines affecting the control of the drone, does anyone know the "rules" on this? if it is true, and what the safe distance is to maintain?I know not to fly between the wires for risk of breaking the air buffer, I just do not want to risk losing the craft to interference thanks.See More
Dec 17, 2015
Oliver Graeser replied to Matt Johnson's discussion DJI S900 alternative??? in the group ArduCopter User Group
"Hello Todd, I'm looking at the same problem as Matt and found your post. Thing is, the configuration you mention above comes out at ~1200 USD w/o battery or propeller, which is about the same as the S900 ARF from DJI. Have prices changed that…"
Dec 1, 2015
Alexey Dobrovolskiy replied to Matt Johnson's discussion Buyers Beware... DJI Professional Line Series Support and Policies...
"Hi Matt, with UgCS (http://ugcs.com) you can continue to use your DJI equipment. UgCS is compatible with 900 GHz DataLink."
Nov 18, 2015
Matt Johnson posted a discussion

Buyers Beware... DJI Professional Line Series Support and Policies...

Just wanted to share my situation with professional business users considering purchasing DJI...Less than three months ago I invested over $15k in a fully loaded spreading wing series setup with supporting ground equipment. 45 days ago I purchased their LK900 Ground Station equipment so I could utilize autonomous flight in my photo and video shoots. They announced that this system I just purchased will no longer work as soon as next month because they do not want to upgrade the maps API to use…See More
Nov 18, 2015
Matt Johnson posted a discussion

Wiring order on RCtimer Gimbal Motors???

I just bought the RCTimer ASP 3-Axis NEX-GH5 gimbal and the motors have three wire solder points but they are not marked as to which one is the signal. Do I wire the signal on the right or left side?This is the gimbal: http://rctimer.com/product-980.htmlI tried emailing RCTimer several times over the past few weeks and they do not respond. I wont be dealing with them again...Thanks,MattSee More
Nov 5, 2015

Profile Information

About Me:
I love aviation and technology. By day I am a technology consultant and software developer. I have a private pilots license and am building a kit plane (Vans RV-7A). I also enjoy doing Christmas Light Shows and this year as on ABC's The Great Christmas Light Fight for a display I did using a Raspberry Pi.
Please tell us a bit about your UAV interest
I am interested in Autonomous flight. I love Aviation and have flown R/C Helicopters and I have a pilots license. I also enjoy Microcontrollers, Single Board Computers (Raspberry Pi), and electronics. I am interested in Open Source solutions.
Hometown:
San Antonio, TX

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