Scott Thompson
  • Male
  • Victoria, BC
  • Canada
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Scott Thompson commented on Makoto EZURE's photo
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"Is that a flying muffin tin?  Terrific setup; wonderful display.  Thanks for sharing."
Sep 16, 2012
Scott Thompson commented on Chris Anderson's blog post Invensense releases licence to allow use of the MPU-6000 DMP processor
"I'm a fan of using the DMP fusion algorithm and started in quads with the intent of using a CH Robotics' CHR-UM6 with a PIC32.  APM 2 came out with even more functionality than what I could install on my real estate and did it in a…"
Jul 28, 2012
Scott Thompson commented on Scott Thompson's blog post First Endeavors: New to RC to Building First Quad to First Flights of Unit.84
"Installed APM2 v2.5.5 and have never experienced a greater flight!  Wanted to share this setup: Frame: Hoverthings VC-550 Motors: AXI 2217/20 ESC: Maytech 30 Battery: ThunderPower G6 4S 3300 mAh Props: Carbon filled; 9" x 4.7 Radio:…"
May 15, 2012
Scott Thompson commented on Jean-Louis Naudin's blog post APMrover v2, a fun UGV project for full autonomous reco missions...
"@Martin: I don't see why one couldn't get the code to pause at waypoints; maybe even future versions can use RFID sensors.  Not sure how or if the GCS would need to get a plugin to handle this/these feature(s)...  Certainly opens…"
May 5, 2012
Scott Thompson commented on Jean-Louis Naudin's blog post APMrover v2, a fun UGV project for full autonomous reco missions...
"My original robot is just not agile enough to perform outside of the halls of university ;)  Thanks to many who posted on here--you've convinced me that I want to play with this feature of a UGV but will instead be switching to a 1/8 scale…"
May 5, 2012
Scott Thompson commented on Jean-Louis Naudin's blog post APMrover-1280, a fun UGV project for full autonomous reco missions...
"I take back my comment about having to stick with the PIC32 here.  I think the Arduino could handle the PID control for each wheel and handle the other tasks such as radio input and servo output.  May have to switch it to integer math,…"
Apr 28, 2012
Scott Thompson commented on Jean-Louis Naudin's blog post APMrover-1280, a fun UGV project for full autonomous reco missions...
"Okay, it looked like an R/C car type of chassis.  I will have to stick to the PIC32 instead of going with the Arduino (although the ATMega is used as the slave MCU for driving the scrolling-text display), as there are significant resources…"
Apr 28, 2012
Scott Thompson commented on Jean-Louis Naudin's blog post APMrover-1280, a fun UGV project for full autonomous reco missions...
"This is great; I've been working on rover code and implementing a version of MAVlink and qGroundControl but it looks like some of the work has been done already.  My code runs on a PIC32MX, though, and uses FreeRTOS to coordinate many of…"
Apr 28, 2012
Scott Thompson posted a blog post

Implementing ESC Fail Safe

I had a request to provide information on how I implemented an ESC fail safe on my quadcopter and posted a small image of the process under the ArduCopter 2.5 firmware thread.  Since I suspect there may be a more general interest in this, I'm posting a blog segment on this fail safe.Above is an image of the process.Also, here's a pdf copyEdit: the Pololu devices are Pololu Servo Multiplexer, Part #…See More
Apr 28, 2012
Scott Thompson commented on Scott Thompson's blog post Implementing ESC Fail Safe
"First, a clarification of my initial motivations: (1) my first quadcopter design was to use redundant flight controllers.  A heartbeat signal would switch between the two controllers.  This was because I was designing my own controller…"
Apr 24, 2012
Ellison Chan commented on Scott Thompson's blog post Implementing ESC Fail Safe
"Michael.  I understand. You may be able to pass radio redundancy by using the joystick control over telemetry radio in conjunction with the rc radio.  The redundancy require seems a little over the top, since real large scale airplanes get…"
Apr 24, 2012
Ellison Chan commented on Scott Thompson's blog post Implementing ESC Fail Safe
"Coptaire, yes, from Jani's response I had the impression it was an quad with redundant motors.  Like he said, it's a lot of extra weight an drag to carry around.  I think for redundancy, since we are in the mode of adding extra…"
Apr 24, 2012
Ellison Chan commented on Scott Thompson's blog post Implementing ESC Fail Safe
"Michael, I don't see the need to sacrifice a craft in event of a radio failure.  That's the reason we have an auto pilot.  The AP should be able to detect radio signal loss, and either hover the craft of attempt a landing.…"
Apr 24, 2012
Coptaire commented on Scott Thompson's blog post Implementing ESC Fail Safe
"@Ellison. Apparently, the APM is in quad config coax, X8. But, only 4 motors are used, the 4 remaining are like a backup. A quad with upper props spinning, and bottom ones unpowered. The 2 pololu boards are configured to react differently, based on…"
Apr 23, 2012
Ellison Chan commented on Scott Thompson's blog post Implementing ESC Fail Safe
"Don't get it.  Is this radio signal failsafe or motor redundancy?"
Apr 23, 2012

JDrones
Jani Hirvinen commented on Scott Thompson's blog post Implementing ESC Fail Safe
"It's the same mux chip that we are using on APM1. Idea is rather good but not sure how well it works in real-life applications as normally you need to start pushing out low PWM values first to start motors. In this case we would bush out…"
Apr 23, 2012

Profile Information

About Me:
Electrical Engineer w/ emphasis in control systems.
Please tell us a bit about your UAV interest
Started with a COTS frame with the goal to create my own controller using a dedicated AHRS w/ EKF (quaternion/Euler angle estimator) that would provide controller redundancy with an FY-90Q backup and a watchdog signal. Never had success with FY-90Q and further research into quads landed me to obtain an OpenPilot CopterControl board, which yielded my first quad flight but was short lived when one of my dogs came 'round with a snoot full of static :( Been on waiting list for ArduPilotMega V2 board and installed it recently and won't look back. It's everything I tried making my controller all wrapped up in a much smaller package with even more features--not to mention a well design ground control station. I've stopped reinventing the wheel, as APM2 is exactly what I need and want and is my go-to controller.
Hometown:
Victoria, BC

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Scott Thompson's Blog

Implementing ESC Fail Safe

Posted on April 23, 2012 at 4:30pm 9 Comments

I had a request to provide information on how I implemented an ESC fail safe on my quadcopter and posted a small image of the process under the ArduCopter 2.5 firmware thread.  Since I suspect there may be a more general interest in this, I'm posting a blog segment on this fail safe.

Above is an image of the process.

Also, here's a pdf…

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First Endeavors: New to RC to Building First Quad to First Flights of Unit.84

Posted on March 11, 2012 at 9:00am 7 Comments

What a journey the past nine months have been.  At university, a classmate built an Arduino-based quadcopter for our senior capstone design project, but I was already committed to a 4WD Mars-type rover robot project.  I was toying around with some RC helicopters, but I had my eye on the quad...

Moved to Canada after graduation and went to work specifying a quad frame, motors, ESCs and such.  So much has happened in the quad industry in the past 9-12 months.  Coming…

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