Fremont, CA

About Me:

Software engineer.

Please tell us a bit about your UAV interest

I've been building model airplanes since I was a kid. Free flight, control line, RC. Also love programming. This project is awesome since it combines my many interests!


Fremont, CA

Activity Feed

Sanjaya Kumar posted a discussion
Yesterday I had several successful tests of Loiter mode, so today I decided to continue testing in windier conditions. After confirming that I had a GPS 3D fix, I switched to Loiter mode. It was windy and gusty, but the quad seemed to be doing well.…
Mar 5, 2012
Sanjaya Kumar posted a discussion
I noticed that the ordering options for APM 2.0 in the diydrones store have changed. You can order the APM 2.0 with either the GPS or the magnetometer (but not both).My order (from Dec 12) is still wait listed. Will I now have to choose between…
Feb 9, 2012
Sanjaya Kumar commented on Ihab Ali's blog post Arducopter 2.3 tuning Stab_P for Nav video scenarios
"Hi Ihab,
Recently, I tried using the tuning process shown for a different platform (openpilot). See the second video on this page:
The idea is to fly it in rate (ACRO) mode and tune the gyro parameters (i.e.…"
Feb 7, 2012
Sanjaya Kumar commented on Ihab Ali's blog post Arducopter 2.3 tuning Stab_P for Nav video scenarios
"Ihab, how did you determine the Rate P values? In my case I found that I had to increase Rate P (to 0.6) and decrease Stabilize P (to 3.0). That's totally the opposite of what you are doing for your quad.

To determine Rate P values, I went into…"
Feb 7, 2012
Sanjaya Kumar replied to Jason Short's discussion Arducopter 2.0.48/49
"I got loiter working today for the first time using 2.0.48. I used default PIDs for loiter/nav.
The conditions were quite gusty and it was awesome to watch it tilt into the wind to maintain position.
After a while I walked up and under the quad and…"
Oct 13, 2011
Sanjaya Kumar replied to Marc Dantonio's discussion Right side motors are consistently producing less thrust in home grown quad...
"Make sure that the motors are exactly vertical. If one or more rotors have a non-zero thrust in the x-y plane, then two of the motors have to work extra hard to compensate for that.
I had the same problem -- I noticed on the raw-sensor radio output…"
Jul 16, 2011
Sanjaya Kumar replied to Troy's discussion Right Motor ESC warm when motors not running
"Is this ESC the one that is powering the APM/receiver etc.? I've noticed that that one gets warm on my quad."
Jun 18, 2011
Sanjaya Kumar posted a discussion
After a recent crash, the capacitor at the back of my magnetometer (v 1.2) sheared off.Instead of ponying up for a new sensor, I wanted to see if I could salvage the existing one.Can someone give me pointers to the eagle files for the diydrones…
Jun 15, 2011
Sanjaya Kumar replied to Sanjaya Kumar's discussion Altitude hold -- throttle reversed?
"I''m trying to understand the code when sonar is enabled ...
In the function update_alt() there is a "spike filter". If, in any one 10Hz iteration (medium loop), the quad's altitude goes up by more than 50cm, then this function will ignore the…"
Jun 10, 2011
Sanjaya Kumar posted a discussion
I put the quadcopter through its paces outdoors today. It was fairly windy -- about 15mph to 20mph. STABILIZE: I had soldered the three low-pass jumpers on the board. Also, I had increased the PID values to .65 (Roll/Pitch) and .5 (Yaw). It flew…
Jun 10, 2011
Sanjaya Kumar posted a discussion
I got the Sonar Sensor today and tried it out. I first tested it. It shows 35 cm from 0 to 35cm and then onwards seems pretty accurate to within a couple of cm.Altitude hold was a lot more precise than just Baro.However, I then tried to increase…
Jun 9, 2011
Sanjaya Kumar replied to R. Brad Curtis's discussion A New Flyer: Notes from the Field
I had outlined this exact scenario in an earlier thread "Arducopter 2.0 first impressions".
There is now an option to have the props spinning all the time when the quadcopter is armed. While it may result in thrashing props after a crash,…"
Jun 5, 2011
Sanjaya Kumar posted a discussion
I find that I cannot connect to the PID screen using XBees. This used to work before.However, I can see the Sensor/Radio-in/Motors-out screens using Xbee. GCS also connects fine.When I try the PID config screen, it says something about an ID…
Jun 3, 2011
Sanjaya Kumar posted a discussion
Today I had a mishap (thankfully recoverable) with my Arducopter. Here's what happened. I engaged ALT_HOLD and for a while it held altitude and then slowly began to climb. I don't have sonar, just baro. In trying to bring it down, I lowered the…
May 31, 2011
Sanjaya Kumar posted a discussion
2.0.14 is my first Arducopter code. My previous experience has been with MultiWiiCopters and I built and flew several quads with this software.Wanting to try out UAV/GPS features, I built an APM and today I swapped out the electronics in an existing…
May 26, 2011
Sanjaya Kumar replied to Jerry Jost's discussion Problem communicating with ACM 2.0.5
"I've finally got things working with GCS/Mavlink/AC2. It is possible that my problems were unique to me, but maybe it will help someone.
First of all, my reset sequence was hanging at the Barometric Pressure Sensor initialization (thanks for the tip…"
May 19, 2011