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

Charles Linquist's Discussions

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

GPS Failsafe

Started Nov 4, 2017 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

 

Charles Linquist's Page

Latest Activity

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…"
1 hour ago
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
Charles Linquist left a comment for Nate Miller
"Verizon talks about how good their coverage is - at ground level.  They don't provide coverage maps at 320'  !  You would think that it should be as good - or better, than what it is on the ground, but that isn't always…"
Aug 30, 2017
Charles Linquist posted a discussion

Joystick scale factor

Is there a way to adjust the "scale factor" of joysticks in MP?  That is, if an input pulse width range is 1200 to 1800 uSec, can I change that so what actually gets sent out is 1000 - 2000 uSec?I have been able to connect a   "SM 600"  simulator joystick to Mission Planner.  This looks like a regular controller, and has 5 analog and 1 digital input channel.  This is much nicer than the Logitech game controller.   The problem is that it has such a narrow output range - the minimum isn't low…See More
Aug 5, 2017
Yogesh Sonar replied to Charles Linquist's discussion Telemetry and HD video over 4G
"Dear friends, can any one please send me proper details on 4g telemetry so I can use . . . Plz guide"
Jul 26, 2017
Yogesh Sonar replied to Charles Linquist's discussion Telemetry and HD video over 4G
"Dear friends, can any one please proper details on 4g telemetry so I can use . . . Plz guide."
Jul 26, 2017
Robert Mapes replied to Charles Linquist's discussion Joystick support
"Charles,  I need to implement your automatic failover between 4G and 915Mhz. Is your small pcb board you previously described available for this?"
Jun 21, 2017
Robert Mapes replied to Charles Linquist's discussion Telemetry and HD video over 4G
"Charles, Do you have more detail on this  little (1" X 1") board which acts as a level shifter / failover / data selector.  That board connects to 6 GPIO and power pins on a Raspberry pi, and 4 pins of a RFD 900 radio (also…"
Jun 19, 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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