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

Charles Linquist's Discussions

Compatible boards

Started this discussion. Last reply by Chris Anderson Feb 18. 1 Reply

I'm looking for a small board (Rpi-size) that will run Dronekit AND has 4 real hardware serial ports.I don't want to use USB->RS-232 converters, or bit-bang the pins.  I need 4 real, hardware…Continue

Tags: pi, Raspberry, Dronekit

Feature request

Started Dec 16, 2017 0 Replies

It would be nice if MP had a feature where you input the maximum distance your craft can normally fly.Then, when entering a mission, whenever a route exceeded 80% of that figure, the route vector…Continue

Map Tool download speed

Started this discussion. Last reply by Andre K. Dec 12, 2017. 1 Reply

Is there any way to increase the speed of the download in the MAP TOOL function of MP?Google can download an offline map in seconds or minutes.  MP takes hours or days.   I travel quite a bit and…Continue

Tags: tool, Map

Compile Failed

Started Dec 11, 2017 0 Replies

I'm using the latest version - 1.3.51  build  1.3.51.0  and every time I try to graph a log file, I get the message "COMPILE FAILED"!  Is there a work-around?Continue

Tags: BUG

 

Charles Linquist's Page

Latest Activity

Charles Linquist replied to Charles Linquist's discussion Telemetry and HD video over 4G
"I use a Raspberry pi running SER2NET, AUTOSSH, WVDIAL, and a few other programs. The switchover between 4G and RFD900 is done in a separate T EENSY processor.  The TEENSY handles a lot of object avoidance stuff too, since it understands…"
Tuesday
Ivan R replied to Charles Linquist's discussion Telemetry and HD video over 4G
"not speaking for OP, but with the Navio2 board I do this today with MavProxy via TCP, with Mavproxy you can multicast to different tagets"
Tuesday
Sushanth J replied to Charles Linquist's discussion Telemetry and HD video over 4G
"Hey, The system seems to be a very useful backup to RFDs. You mentioned about a special server setup, can you please explain how you're pushing a mavlink stream to an online server?"
Monday
Charles Linquist replied to Charles Linquist's discussion Telemetry and HD video over 4G
"I use an RFD900+,  but I have put together a package (mostly from Texas Instruments) that gives me even more power than the RFD900.  It consists of two boards and I will probably combine them into one someday. It is a real headache that…"
Apr 14
Ivan R replied to Charles Linquist's discussion Telemetry and HD video over 4G
"pretty nice, you should definitely do it....am kinda of doing the same thing, except manually, i run 2 simultaneous copies of MissionPlanner GCS, one connected via IP to the 4G modem and the other one serial to the RFD900x, either can fail and…"
Apr 13
Charles Linquist replied to Charles Linquist's discussion Telemetry and HD video over 4G
"I was surprised as well.  But the cell companies build their antennas to "shove" the signal toward the ground in order to maximize coverage area. In my area (near San Jose, CA), there are totally dead spots in coverage at 300'. I…"
Apr 13
Charles Linquist replied to Charles Linquist's discussion Telemetry and HD video over 4G
"I'll tell you a little more - I am strongly considering selling a package with everything set up.  My package works with both APM and PixHawk controllers. The controller always "talks" at 115Kbaud, but that is buffered and…"
Apr 13
Ivan R replied to Charles Linquist's discussion Telemetry and HD video over 4G
"btw i just use a RPi3 with Huawei 4G USB dongle and mavlink telemetry/control via MP and also have RFD900x radios for backup and RC control...I connect MP to the RPi IP and another MP instance connected simultaneously via RFD900x and it also does…"
Apr 13
Ivan R replied to Charles Linquist's discussion Telemetry and HD video over 4G
"Charles, am surprised to hear the cell tower reception is worse at altitude...i get pretty good signal  (4 bars) on mine at 300ft or so, and the tower nearest is like 1 mile away.....i always thought with signal it would be better at altitude…"
Apr 13
Charles Linquist replied to Charles Linquist's discussion Telemetry and HD video over 4G
"I'm a little reluctant to give too much away, since I worked very hard to get things working the way they are now - especially with the live HD video feed I get over 4G. I will tell you that getting a hand-held remote (with real joysticks and a…"
Apr 13
Ray Anderson replied to Charles Linquist's discussion Telemetry and HD video over 4G
"I have been looking for a way to connect via 4g to fly highway inspections and provide transportation security feeds via 4G.  Is there any chance that you could provide a schematic of what you are currently flying?  Once I can prove…"
Apr 13
Charles Linquist replied to Charles Linquist's discussion Telemetry and HD video over 4G
"I realize that a static ip would make things work without a server.  But I also use webRTC, and that requires a server (at least as far as I know).  So I needed a server anyway, so using that same server to deal with the ip issues fixes…"
Apr 11
Ivan R replied to Charles Linquist's discussion Telemetry and HD video over 4G
"I do this today using FlytOS with a Pi3 and a USB 4G modem, you dont need any special server if you get a static IP from your ISP , i then use my own home PC    https://www.youtube.com/watch?v=mJrobih0Kqk&t=18s"
Apr 11
Bjoern Kellermann replied to Charles Linquist's discussion Telemetry and HD video over 4G
"Hi Charles, I am interested. As we have carrier NAT in Germany, all mobile devices have private IPs and cannot offer services directly. We need a facilitator to connect two mobile devices. Maybe you can setup the facilitator/mediator service with…"
Feb 26
Guy Tzoler replied to Charles Linquist's discussion Telemetry and HD video over 4G
"Can you please explian how you setup the AWS machine to do the connection between the drone and the mission planner?"
Feb 26

3D Robotics
Chris Anderson replied to Charles Linquist's discussion Compatible boards
"Beaglebone Blue?"
Feb 18

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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