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 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…"
Friday
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!"
Thursday
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."
Thursday
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…"
Wednesday
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…"
Wednesday
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
Azhar T. Pangesti commented on thomas Butler's blog post Are you still "puffing" LiPos?
"So uhmm what exactly to do in order to avoid puffing? Don't over-discharge.. to what voltage? (3.3v?) Don't over-charge.. so what? 1C? I never put the battery under 3.3v and never charge over 2C (despite the manufacturer's bogus 5C…"
Jul 21
Gary McCray commented on thomas Butler's blog post Are you still "puffing" LiPos?
"Hi Thomas, Excellent post. I have linked to your Blog discussion here from my Drones Are Fun Website's Batteries for UAV page here: http://dronesarefun.com/BatteriesForUAV.html#BatterySafety Best Regards, Gary"
Jul 20
thomas Butler posted a blog post

Are you still "puffing" LiPos?

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 any information I have compiled! The LiPo…See More
Jul 20
thomas Butler replied to Bravo Sierra 80's discussion What battery? [SOLVED]
"Hey Bravo, Just to clarify the “C” discharge rating is how fast the battery can discharge its energy in one hour. A 20C 4000mAh battery (which is a 4amps capacity battery) can discharge at 20 times 4amps in a 60 minute period;…"
Jul 20
thomas Butler replied to Bravo Sierra 80's discussion What battery?
"The size of the battery is dependent on the size of the props, and the motor required to spin the props to get the needed thrust, and the thrust required to lift the All Up Weight (all the parts and pieces AND 4000mAh 500g battery) of your…"
Jul 20

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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