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 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…"
8 hours ago
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…"
20 hours ago
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. "
yesterday
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…"
Tuesday
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…"
Tuesday
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
thomas Butler commented on Alex Zarenin's blog post Yet another Flight Control Board
"OK Alex. As I suspected, your effort is an academic excercise. Have fun."
Jul 24
thomas Butler commented on Alex Zarenin's blog post Yet another Flight Control Board
"Hey Alex, Unless this is an academic exercise for a master's thesis (or you work for MicroChip), why the PIC chip? The defacto standard has become the STM32F4xx; 189hz, with its FPU. As has using the 5883 and 5611. The 5983 isn't really…"
Jul 23
thomas Butler replied to Spencer Willis's discussion Prop nut tightening in the group Arducopter Y6 Owners
"Reverse threads is nothing new.  A bicycle pedal crank has had a left & right threads forever.  That's the way the output component will self tighten to the drive component.  It's a fundamental mechanical configuration…"
Jul 23
thomas Butler replied to J'Rome's discussion Top 10 reasons DIY mini-uavs crash & the recommended equipment/procedure to address it?
""This is a very important question "; especially for companies looking for free research or a person looking to write a thesis paper...which is why there are probably so few responses!  Not only is the "why" requested,…"
Jul 22
avionics commented on thomas Butler's blog post Are you still "puffing" LiPos?
" I have been using LIPO batteries for more than 8 years now and I feel I have wasted my money, I have followed the instructions closely and never charged more than 1C etc etc. I hope the industry comes up with a newer solution. "
Jul 21
thomas Butler commented on thomas Butler's blog post Are you still "puffing" LiPos?
"@Azar, The "...user should not exceed the battery manufacturers specification for discharge and charge." If you believe that you have followed the mfgr's specs, call them and complain. Maybe they will send you a replacement; ha! At…"
Jul 21
Søren Kuula commented on thomas Butler's blog post Are you still "puffing" LiPos?
"I have had puffed LiPo's that weren't bad. And bad LiPo's that weren't puffed. Wonder if the 2 are correlated :) ?"
Jul 21
Quadzimodo commented on thomas Butler's blog post Are you still "puffing" LiPos?
"All the point in the blog post and comments are pretty much spot on. Gary - Agreed, this all makes great additions to your batteries page.  Including Azhar, John and Dave's comments - don't go below 3.3 (loaded state. NOTE - Cells…"
Jul 21

Developer
John Arne Birkeland commented on thomas Butler's blog post Are you still "puffing" LiPos?
"Simply put, always follow the battery C rating, and don't pull more then 80% total capacity out of the battery. Usually this means charging in the 1-5C range and 20-50C discharge depending on battery brand."
Jul 21

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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