thomas Butler
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  • Rockford, IL
  • United States
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quad crash because of corrupt PID value EEPROM...no CRC check of EEPROM/PID values ???!!!

Started this discussion. Last reply by thomas Butler Aug 31, 2013. 2 Replies

My quad crashes for some unexplicable reason.  The copter would bank right on takeoff; looking at the quad from the rear (viewed from the front this would be a bank to the left)  I hooked up Mission…Continue

 

thomas Butler's Page

Latest Activity

thomas Butler commented on Víctor Mayoral's blog post Towards an Open Source Linux autopilot for drones
"Using Linux because it would create "a safer Linux autopilot" is debatable. Unfortunately, the system described here adds a magnitude of complexity, and the system opens the door to an endless software development project. Although…"
Wednesday
thomas Butler commented on Bill Isenberger's blog post SteadiDrone IRIS/IRIS+ Conversion Kit
"Another 3DR bash...everybody has a better airframe!"
Oct 9
thomas Butler commented on chrisa's blog post Heavy lifting VTOL technology, frames.
"Yaaawwnnn! Do your R&D!"
Oct 9
thomas Butler commented on Nick Arsov's blog post AUAV-X2 ( the revised version of X1 ) is alive
"@Bill, Sir I hate to disagree, but that is why we have a democracy. DCM filtering is working just fine on my $50 Crius so why would I need the CPU intensive Kalman? Because then I need a PX4/STM3/PixHawk? I see no valid argument for it! AND I still…"
Sep 27
thomas Butler commented on Roberto Navoni's blog post VR ESC 2.0 Tech Preview
"So what! You folks at VRB are way behind the Chinese! Go home and just go do yard work, and take your rediculous VRBarain to the morgue!  You are not creating anything new! "
Sep 27
thomas Butler commented on Nick Arsov's blog post AUAV-X2 ( the revised version of X1 ) is alive
"Hey @Bill, I'm just trying to clarify how the Pixhawk code is using the gyros. Thanks for your input. I see that the gyro utilized in flight has been changed in v3.2 by placing the MPU60xx initialization before the L3 in the RC.APM boot script.…"
Sep 22
thomas Butler commented on Nick Arsov's blog post AUAV-X2 ( the revised version of X1 ) is alive
"@Bill, I looked at the source (v3.2) and it can be set to use only the the MPU6xxx. In addition, which chip it uses when two are in the system depends on which is defined first/initializes in the source code.  I doubt adding more chips will…"
Sep 21
thomas Butler commented on Nick Arsov's blog post AUAV-X2 ( the revised version of X1 ) is alive
"And, price with no pins soldered or with straight pins?"
Sep 20
thomas Butler commented on Nick Arsov's blog post AUAV-X2 ( the revised version of X1 ) is alive
"Looks good, but the advantage to the daughterboard IMU is its saving your company the need to scrap your inventory when you decide to upgrade to different components; no real benefit to the customer. The board is more reliable when the components…"
Sep 20
thomas Butler commented on Chris Anderson's blog post How 3DR tests camera gimbals
"Additionally, a more accurate evaluation could be made using a test platform which could be merely a second heavier gimbal that runs a programmed sequence of pitch and rolls in a predetermined standardized time period; performs the same function as…"
Sep 19
thomas Butler commented on Chris Anderson's blog post How 3DR tests camera gimbals
"That looks like a pretty sophisticated and expensive test fixture, but there is a much simple way to analyze a gimbals performance using statistical process control (SPC).  As a stand alone tester; attach an IMU with a 6050 to the camera and…"
Sep 18
thomas Butler commented on Scott Penrose's blog post How drones and UAVs are already affecting construction jobstites
"Been there done that! One of the original reasons I built a copter; job inspections. See my copter inspect a new roof at my house. "
Sep 17
thomas Butler commented on Chris Anderson's blog post 3DR announces partnership with Intel on Edison for Linux-based companion for Pixhawk
"The 180mhz STM32F4xx which is based on the ARM Cortex-M series is pretty potent with the ArduCopter code, and the CPU has yet to have its capability maxed out by APM/PX4 code. As far as the Intel Edison as a UAV controller, there are much better…"
Sep 16
thomas Butler replied to Dimitris Tripakis's discussion Are the Pixhawk or APM or other auto-pilots fully programmable ?
"The source for ArduCopter is open. You can modify it as you see fit.  If you use a Atmel2560 CPU controller, you would use the Arduino IDE. Your "control program" would modify the P term of the PID controller for rate in conjunction…"
Sep 16
thomas Butler commented on sixtimesseven's blog post DroTek releases DroPix flight controller
"Another STM32 FC which doesn't quite hit the mark.  What is the bolt pattern? No info on the web site. 45x45?  Make it 45x45 with a 50x50 L and W. Standardize... They should go back to the CAD board and add PWM input to take…"
Jul 25
thomas Butler commented on Alex Zarenin's blog post Yet another Flight Control Board
"Fine and dandy that "develope code from scatch". Who cares?  Live well and make no money!"
Jul 24

Profile Information

About Me:
software engineer
Please tell us a bit about your UAV interest
aerial photography
Hometown:
rockford, illinois

Thomas Butler's Blog

Are you still "puffing" LiPos?

Posted on July 20, 2014 at 11:30am 11 Comments

This is a compendium of information on LiPos.  At this point in the UAV/multicopter game users should not be damaging their LiPos. That is just giving away money to the battery manufacturers. A few simple rules will help the LiPo last a long time. 

 

Please feel free to add or correct…

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Super simple and compact quadcopter power distribution module

Posted on November 28, 2013 at 7:00am 13 Comments

I'm amazed how complicated some of the designs are for the power distribution of a quadcopter so I made my own. 

To monitor current put the sensor between the power source and one ESC in order to get a value that can be multiplied to calculate…

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