thomas Butler
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  • Dpo, AE
  • 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 replied to Rich B's discussion Pixhawk vs Pixhawk 2?
"Been doing it for years!"
13 hours ago
thomas Butler replied to Randy's discussion Copter-3.3 beta testing
"Hey Craig, Sometimes being on the forefront of technology requires trade-offs, more than likely the system is running out of code space. According to the release notes, a lot of functionality, bells, and whistles have been added since version 3.2.5;…"
yesterday
thomas Butler replied to Rich B's discussion Pixhawk vs Pixhawk 2?
"@Jake, Your are welcome. Only trying to be factual and not opinionated. It's not known if the schematics released represent the production version, and I wouldn't call the issues described as bugs but rather design compromises. FPC is only…"
Friday
thomas Butler replied to Rich B's discussion Pixhawk vs Pixhawk 2?
"I've looked at the schematics for the "PixHawk 2" revision 3, and there ARE some issues.  As open source hardware (derived from the PX4), these free observations should be welcome to the "PixHawk 2" developers.…"
Thursday
thomas Butler replied to Rich B's discussion Pixhawk vs Pixhawk 2?
"At this point in the game of consumer drone marketing, it's all about the money. I'm guessing because they are cheaper and the company had a zillion on-hand!"
Jun 24
thomas Butler replied to Rich B's discussion Pixhawk vs Pixhawk 2?
"The pictures are lousy. Too bad whomever took the pics doesn't know how to take closeup pictures (don't use flash) or lay out a tear-down. Oh well! perhaps someone else will re-do!"
Jun 22
thomas Butler replied to Rich B's discussion Pixhawk vs Pixhawk 2?
"That helps to make it proprietary! How about some pics. Thanks!"
Jun 22
thomas Butler replied to Rich B's discussion Pixhawk vs Pixhawk 2?
"How about some pics?! Thanks!"
Jun 22
thomas Butler replied to Rich B's discussion Pixhawk vs Pixhawk 2?
"Time for a complete Solo teardown!"
Jun 20
thomas Butler replied to Rich B's discussion Pixhawk vs Pixhawk 2?
"It's interesting that the Solo specification and advertising says "two 1Ghz computers" and a " the Solo uses a Pixhawk flight controller", yet the PixHawk 2 schematics clearly show the Pixhawk 2 to be a re-packaging of the…"
Jun 20
thomas Butler commented on Marco Robustini's blog post "APM:Copter V3.3 RC5" - Failure and recovery: one motor rotated by 90° during flight
"Hey Marco, thanks for the response. That's good to know. Two mechanical improvements could be made. first, perhaps if the clamp had been keyed into the arm this would not have happened.  Second, the clamp is compressing the tube. Carbon…"
Jun 20
thomas Butler commented on Marco Robustini's blog post "APM:Copter V3.3 RC5" - Failure and recovery: one motor rotated by 90° during flight
"Hey Marco, did you land the copter or did the firmware?   More to the point; if the firmware instigated the landing, that might NOT be a desirable function.  The copter could have been over an are where landing was not possible. This is…"
Jun 19
thomas Butler replied to Rich B's discussion Pixhawk vs Pixhawk 2?
"@turdsurfer, Please elaborate on "too noisy for the airframe". Thanks!"
Jun 19
thomas Butler replied to George Finlay's discussion Took delivery on 2 Solos 6-5 in the group 3DR SOLO
"Why not post a video of this rather than explain it?! A picture is worth a thousand words. Happy flying luck!"
Jun 11
thomas Butler replied to Prasanna Pillai's discussion Drone design
"Venturi with propeller in 1932 and ducted fans. Calculate the gain in thrust (added lift) minus the added weight (lost lift) of the design... "
Jun 7
thomas Butler posted a photo

FC2014a_frag1

Here's our new STM32 flight controller under development; yes another STM32 board! Will run ArduCopter. NOT a PixHawk clone! Ready fall 2015. Made in USA.
Jun 3

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Please tell us a bit about your UAV interest
aerial photography
Hometown:
chicago,illinois

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Thomas Butler's Blog

What bearings for my multi-rotor copter motor?

Posted on November 21, 2014 at 1:41pm 13 Comments

What bearings in copter motors?  The type of bearing is a “deep groove” ball bearing.  

 

The axial load (applied force is parallel to motor shaft) placed on the motor is no different than…

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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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