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 commented on Thorsten's blog post u-blox M8N - ground planes, antennas and positional accuracy
"Of course the three element plane functions as the ground plane for a vertical radial. Oops! Additionally, to be fair to the 6H, is the 8N capability of filtering out data from satellites at x degrees below the horizon being utilized?"
May 11
thomas Butler commented on Thorsten's blog post u-blox M8N - ground planes, antennas and positional accuracy
"@Nikola, that's easy; 1/4 wavelength or 47mm (190mm wavelength/4) for 1.5ghz (L1 GPS). Note that the ground plane is a reflector and could just as easily be made with three radially and equidistantly spaced wires as opposed to a copper disc or…"
May 10
thomas Butler commented on Thorsten's blog post u-blox M8N - ground planes, antennas and positional accuracy
"Additionally, something to consider in testing is that depending on the position of the laptop in relation to the GPS the ground plane might be shielding the GPS from harmonics generated by the laptop, and the proximity of the laptop (a source of…"
May 10
thomas Butler commented on Thorsten's blog post u-blox M8N - ground planes, antennas and positional accuracy
"Perhaps a statement of the problem is in order!  For instance, accuracy of GPS data can be affected by signal quality, EMI, and antenna design. Data quality can be affected by the number of visible satellites and how high above the horizon they…"
May 10
thomas Butler commented on Patrick Duffy's blog post How to control a GoPro Camera on APM/Pixhawk with a Raspberry PI using WiFi
"@Stuart & @Patrick, losing radio connectivity can be dependent on the RC technology used.  Flying in the vicinity of other RC transmitters should  be no problem because of the low bandwidth requirement of RC and the RC transmitters can…"
May 10
thomas Butler commented on Matthew Coleman's blog post The uNode
"Oops! Here's the pic of adapter for Crius All-In-One. Additionally, the Pixhawk does have a 12 pin FFC cable connection (for off-board sensors via SPI) on it's PCB, but the FFC connector isn't mounted on the board! Oops! So it's…"
May 4
thomas Butler commented on Matthew Coleman's blog post The uNode
"hey @benbojangles, that's a valid point regarding the use of FPC. Most flight controllers (Crius, APM, Pixhawk, et al) are fundamentally flawed in that they have the vibration sensitive components (gyro & accel) mounted to the flight…"
May 4
thomas Butler commented on Chris Anderson's blog post Enrollment climbing in college drone training programs
"And don't forget that a UAV wouldn't even fly without software engineers!"
Apr 30
thomas Butler replied to Kris Kitchen's discussion Landing drone flips over and will not turn off? in the group IRIS
"Hey Rob, rather than just say "really bad idea" would you please elaborate!  Thanks.   I see in this thread that YOU are supposedly working on a kill switch albeit as another ArduCopter feature. Additionally, I see right now…"
Apr 22
thomas Butler replied to Kris Kitchen's discussion Landing drone flips over and will not turn off? in the group IRIS
"I disagree! If I had had a kill switch my copter might not have been damaged as much as it was.  The copter landed on a porch roof, and the motors kept running! I like the peace of mind of a kill switch which bypasses ALL software controlled…"
Apr 22
thomas Butler replied to Cala's discussion Pixhawk connectors in the group PIXHAWK
"http://www.amazon.com/Engineer-PA-09-Micro-Connector-Crimpers/dp/B002AVVO7K <- crimp tool for $38 ! It's not set in stone that DF13 plugs must be used; Molex/JST 1.25mm pitch plugs will work."
Apr 19
thomas Butler replied to Kris Kitchen's discussion Landing drone flips over and will not turn off? in the group IRIS
"The problem with flight controller fail-safes implemented in the FC software is that the FC can be in never never land and continue to send out a PWM to the ESCs. Here is one cheap and easy option that could be considered a fail-safe, and I plan to…"
Apr 13
thomas Butler replied to Kris Kitchen's discussion Landing drone flips over and will not turn off? in the group IRIS
"I remember seeing somewhere that the motors will shut down if the copter is inverted for more than two seconds (of course this would be undesirable for acrobatic flight)...might be in the MegaPirateNG code (a port of ArduCopter for the…"
Apr 12
thomas Butler replied to Byron Will-Noel's discussion Canon SX260 vs GoPro with Flat Lense & NDVI
"The problem with the cameras with a telescoping lens is that they are easily broken, or the mechanism gets jammed by influx of dirt/dust. I have gone through about ten Nikon Coolpix cameras over the past five years. I've settled on the s3100;…"
Apr 3
thomas Butler commented on WhiteKnight's blog post TBS Blackbox now interfaced with MAVLINK based FC! (APM, Pixhawk, SmartAP, etc...)
"Hmmm! First, this post says nothing about what the "TBS Blackbox" is; might be a good idea to give a description!  Second, it is noteworthy that the cable has a DF13 on one end and a Molex connector on the other. The use of a Molex…"
Apr 1
thomas Butler commented on Víctor Mayoral's blog post Erle-brain, an open hardware Linux autopilot
"Why do you morons keep calling your products "brains'? It is as obnoxious as the "i" craze of the 90's as in "iPhone"; VRBrain, FPVBrain.....no "brain"; just stupidity in not being able to be innovate for…"
Dec 24, 2014

Profile Information

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

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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