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 on Monday. 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


3D Robotics
Chris Anderson replied to Charles Linquist's discussion Compatible boards
"Beaglebone Blue?"
Monday
Charles Linquist posted a discussion

Compatible boards

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 UARTS. And it would be a bonus if the RS-232 ports were 5V tolerant.Does such a board exist?See More
Sunday
Marc Dornan replied to Charles Linquist's discussion Telemetry and HD video over 4G
"Thanks Charles. BTW: This is a Parrot Disco! https://www.youtube.com/watch?v=m1Fpq4inefg They are now available for $399 (clearance basically), down from $1300 on launch. They are a perfect candidate for 4G control. And you confirmed what I have…"
Jan 29
Charles Linquist replied to Charles Linquist's discussion Telemetry and HD video over 4G
"The IP addresses are managed by the AWS server ("ec2").   Both sides - the ground and the air contact the same server - by name.  The server is set up to run a "reverse SSH tunnel".  Since both sides have…"
Jan 29
Mago replied to Charles Linquist's discussion Telemetry and HD video over 4G
"Hi all, one big question: how the IP address or "reachability" is managed? Is there a way to use AWS or an AWS-like service? I think DynDNS is not working anymore"
Jan 29
Charles Linquist replied to Charles Linquist's discussion Telemetry and HD video over 4G
"NO, I'm not monitoring this thread.  And.... I don't know what a DISCO 2 is. The telcos do not normally let you call someone and then automatically "push" data to them.  The other person has to start an application…"
Jan 23
Marc Dornan replied to Charles Linquist's discussion Telemetry and HD video over 4G
"Charles -- not sure if you are monitoring this thread. Can you take a look at this video and specifically the technical comments and advise if you think there is a data carrier (Verizon/T Mobile) whose 4G modem that could work with this setup. I…"
Jan 23
Charles Linquist left a comment for SV
"Although I still use the Novatel 551, I am planning to change.  I'm sending live video over 4G as well as telemetry, and there are devices that are a bit faster.    Where are you located?"
Jan 3
Charles Linquist posted a discussion

Feature request

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 would change color (say to red).I realize that there are other factors that affect distance, but such a feature might save an expensive piece of hardware now and then.See More
Dec 16, 2017
Andre K. replied to Charles Linquist's discussion Map Tool download speed
"Try qgroundcontrol and apmplanner2 , faster in every way"
Dec 12, 2017
Charles Linquist posted discussions
Dec 12, 2017
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, 2017
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, 2017
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, 2017
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, 2017
Charles Linquist posted discussions
Sep 17, 2017

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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