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

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…"
Monday
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 !"
Monday
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
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
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
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
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
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
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
Charles Linquist posted a discussion

What previous version has fully functional joystick control

I need to be able to control my craft with a joystick.  This function is broken in the later versions of MP.  I would like to know what is the latest version with fully functional joystick control, and where is a reliable source for that version?See More
Jun 12
Charles Linquist posted discussions
Jun 4
Charles Linquist replied to Charles Linquist's discussion Strange change in MODE - please help
"The actual GPS chips are about the same size in drones and phones, and the magnetometers are the same.  The GPS  antennas on drones are generally larger and tte larger the antenna, the better the signal. And although phones…"
May 25
Frank-n-flein replied to Charles Linquist's discussion Strange change in MODE - please help
"It could prob be due to the fact that the magnetometers in drones are more sensitive than the ones on phones and that the GPS tracking devices or GPS modules attached to drones are more powerful than the ones in phones. Just from size alone you can…"
May 24
Charles Linquist posted a discussion

Problem setting telemetry channel to 115Kbaud on APM 2.6HW?

Using FW 3.2.1 and APM 2.6, is there any issue with setting the telemetry channel to 115Kbaud?  I realize that the USB port is already running at that speed, but was wondering if there are any software timing problems that could result from running SERIAL1  port faster than 57.6K.See More
May 21

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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