About

Gender

Male


Location

Lima


About Me:

Mechatronics engineer


Please tell us a bit about your UAV interest

Working at a drone startup and trying to understand better the nitty-gritty details of UAVs.


Hometown:

Lima


Activity Feed

Javier Cerna replied to John Longland's discussion Prioriy levels for flightmodes in PIXHAWK
"Hi John,
If you're using a radio, just change mode with one of the radio sticks as usual. It will override the RTL."
Jun 8, 2018
Javier Cerna replied to moriarty's discussion strange behaviour of pixhawk-request help to understand in PIXHAWK
"To be completely honest, I'm not sure why that's happening. But try to flight the drone first in Stabilize Mode. In one of your logs, it seems that you start in Loiter and go up to 2 m and then crash it. I'm not quite sure how it influences the…"
Jan 22, 2018
Javier Cerna replied to moriarty's discussion strange behaviour of pixhawk-request help to understand in PIXHAWK
"Hi,

Judging from your flight log, you have a really high voltage drop. I'm not sure if that's the issue, but going from 24 V to 17 V on launch seems unusual. Maybe the C parameter of your battery is too low, or they are not in good shape. The peak…"
Jan 22, 2018
Javier Cerna replied to moriarty's discussion strange behaviour of pixhawk-request help to understand in PIXHAWK
"Regarding the power module, you could use this one, from 3DR:
https://store.3dr.com/products/10s-power-module"
Jan 8, 2018
Javier Cerna replied to Melvin's discussion WAYPOINT REACHED
"Hi Melvin,
You can send commands in an Auto mission by using the camera commands:
http://ardupilot.org/copter/docs/common-camera-control-and-auto-mis...
Particularly, you should use DO_SET_CAM_TRIGG_DIST or DO_DIGICAM_CONTROL depending on your…"
Jul 10, 2017
Javier Cerna replied to Melvin's discussion WAYPOINT REACHED
"Hi Melvin,

Check this guide and the source code in the bottom of that page. There is some code to execute some actions based on the waypoint the drone is currently heading to. You could store the next_waypoint in a variable and as soon as it…"
Jul 10, 2017
Javier Cerna replied to Melvin's discussion WAYPOINT REACHED
"You could add a delay of 3 to 5 s in the command:
http://python.dronekit.io/automodule.html#dronekit.Command

Hope it helps!

Javier"
Jul 9, 2017
Javier Cerna replied to Andy Fabian's discussion How to control yaw rate and yaw accel in auto?
"I know this thread is a year old, but I was trying to figure out the difference as well, and I found the answer in the code changelog:

So, ATC_ACCEL_Y_MAX controls the max acceleration in manual flight modes, while ATC_SLEW_YAW controls the yaw…"
Jul 6, 2017
Javier Cerna posted a discussion
Hi,I was flying a new quadcopter on Friday to test the Auto flight mode. I had a successful first mission and I tried to replicate it. Since my last waypoint was facing the opposite direction from takeoff and the RTL kept this heading, I manually…
Jul 2, 2017
Javier Cerna replied to Venkatakrishnan's discussion Why the drone Crashed ?
"Did you configure all your mandatory hardware as mentioned in the documentation? The throttle values sent by your radio seem really weird, unless that was you turning on and off the remote several times.


Other issue could be that your barometer…"
Jun 23, 2017
Javier Cerna replied to Venkatakrishnan's discussion Why the drone Crashed ?
"It's somewhat difficult to say what exactly happened without more information. The graph is cluttered with radio failsafes and so it changes modes from Loiter to land to RTL and it's not that clear what were you trying to do. Can you detail which…"
Jun 23, 2017
Javier Cerna replied to Venkatakrishnan's discussion Why the drone Crashed ?
"Hi,

By using the Auto Analysis tool from Mission Planner, I got the following results:
Size (kb) 26471.8544921875No of lines 352152Duration 0:24:47Vehicletype ArduCopterFirmware Version V3.2.1Firmware Hash 36b405fbHardware Type Free Mem 0Skipped…"
Jun 23, 2017
Javier Cerna replied to Javier Cerna's discussion Copter crashed unexpectedly
"I would really appreciate some opinion on what happened based on the flight log posted, since I think it would be useful to have a fresh pair of eyes looking into this issue.

Thanks a lot again."
Jun 20, 2017
Javier Cerna posted a discussion
Hi,I've been flying with my large quad for almost a year, and I've never had an issue with the motors, until a couple of days ago. The quad was flying in auto mode in an area where I have already tried a few times, and it was behaving correctly.…
Jun 15, 2017
Javier Cerna posted a discussion
Hi,I asked this in the Ardupilot forum a couple of days ago, but I received no response so I'm asking here. I apologize for repeating the…
May 26, 2017
Javier Cerna replied to Javier Cerna's discussion [SOLVED] Maxbotix EZ4 Sonar in quadcopters
"I copy here the answer from Maxbotix, in case it helps someone else:
You state the following information: The value at which the sonar saturates it's the maximum one (7.64 m). From the picture, you can see that the copter is descending, but it has…"
May 18, 2017
More…