Charles Linquist
  • Male
  • Campbell, CA
  • United States
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Charles Linquist's Discussions

GPS Failsafe

Started Nov 4 0 Replies

Using APM 3.2.1:It is my understanding that if I am flying in AUTO MODE and have GPS failsafe set to "2" and the craft loses GPS, it will go into ALT-HOLD mode.  And it is also my understanding that…Continue

Strange altitude drop issue - please help me analzye log file.

Started this discussion. Last reply by Charles Linquist Sep 17. 1 Reply

Flying an APM 2.8 board, setup a waypoint flight using Mission Planner.  Set altitude of all waypoints to 100M.  Flew two missions.  The first mission went perfectly.  The second, with more waypoints…Continue

Tags: problem., Altitude

Can't upload waypoints

Started Sep 17 0 Replies

I can't upload waypoints anymore.  This function used to work until very recently.I'm using Mission Planner 1.3.49, and I also tried 1.3.48.  Same problem.Setup:Win10/64APM 2.6Now EVERY time I try to…Continue

Flight Controller Identification

Started Aug 27 0 Replies

I found what looks like a mini PixHawk clone in one of my electronics boxes, and I would like to identify it - especially the pinout.  Attached are the top and bottom views of the 40mm X 40mm board. …Continue

Tags: controller, Pixhawk

 

Charles Linquist's Page

Latest Activity

Charles Linquist left a comment for Charles Linquist
"It gets fairly complex, but - in the Raspberry, I used SER2NET, and connect the serial port of the Raspberry to the telemetry port of the PixHawk.  I plug a VERIZON 4G/LTE "dongle" into the USB port of the Raspberry.  In the…"
Nov 13
Sebastien left a comment for Charles Linquist
"Hello Charles, Im looking to connect my pixhawk via a raspberry to mission planner. I see that you did it. Could you tell me What kind of server do you instanciate to communicate between raspberry and mission planer ? An amazon aws ? Thank you !"
Nov 13
Charles Linquist posted a discussion

GPS Failsafe

Using APM 3.2.1:It is my understanding that if I am flying in AUTO MODE and have GPS failsafe set to "2" and the craft loses GPS, it will go into ALT-HOLD mode.  And it is also my understanding that it will not "leave" this failsafe mode unless it gets a signal from the ground to change MODEs, or another MODE change is triggered by yet another failsafe (such as low battery voltage).Is there any way to cause the flight controller to resume the mission if the GPS signal becomes active again (when…See More
Nov 4
Charles Linquist replied to Charles Linquist's discussion Strange altitude drop issue - please help me analzye log file.
"Her is the .bin file"
Sep 17
Charles Linquist posted discussions
Sep 17

Profile Information

About Me:
Electrical Engineer
Please tell us a bit about your UAV interest
Have 2 quads
Hometown:
Campbell, CA

Comment Wall (2 comments)

At 4:17am on November 13, 2017, Sebastien said…
Hello Charles, Im looking to connect my pixhawk via a raspberry to mission planner. I see that you did it. Could you tell me What kind of server do you instanciate to communicate between raspberry and mission planer ? An amazon aws ? Thank you !
At 9:51am on November 13, 2017, Charles Linquist said…

It gets fairly complex, but - in the Raspberry, I used SER2NET, and connect the serial port of the Raspberry to the telemetry port of the PixHawk.  I plug a VERIZON 4G/LTE "dongle" into the USB port of the Raspberry.  In the Raspberry, I use WVDIAL, pppd and AUTOSSH to make the connection to an Amazon ec2 server via the 4G link..

The Amazon server is running a reverse SSH tunnel.  

On the ground side, I have another 4G/LTE "dongle" plugged into my laptop (but you could use a 'hot spot'), I then set up Mission Planner to use a tcp connection to the Amazon ec2 server using only the 
Amazon server's name and the appropriate port number.

The connection from the 'copter' to the Amazon server is secure, but the connection from that Amazon server to my laptop is not.  I'll change that soon.  I'll use another Raspberry on the ground to create a secure connection to the Amazon server and connect the Raspberry to my laptop via USB.  I need a Raspberry on the ground anyway, because I have designed a "failover" system and PCB which seamlessly switches between 4G and 915Mhz telemetry on both ends.  Both ends (air and ground) transmit simultaneously on 4G and 915Mhz. Both ends pick which source is best at any time and use that source.  Mission Planner cannot switch between two sources of telemetry/control, but the Raspberry can.  The Raspberry picks between validated sources and sends data to MP using one connection method and one data rate.

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