Tom McKinnon
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  • Boulder, CO
  • United States
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Latest Activity

Tom McKinnon replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"Hughes, Thanks!  It always seemed like a waste not to use the integrated BEC as a backup but I wasn't 100% sure how to configure the diodes.  This setup is just the trick. Best, Tom"
Jun 12

3D Robotics
Craig Elder replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"1) it is probably not as reliable as the PM.  It is almost certainly noisier. >>>  If using a separate BEC, does it make any sense to use the built-in one as a backup? I'm not sure what you mean "
Jun 11
iskess replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"My leads are about 6cm. I can shorten then to about 3cm if it makes such a difference. The fuselage constraints prevent me from attaching directly to the rail."
Jun 11
Tom McKinnon replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"Craig, Thanks for the detailed explanation.  A few questions: 1.  Do you ever consider the built-in BEC on an ESC to be a reliable supply?  Or is the environment of the ESC (heat, etc) just a bad place to put a mission-critical piece…"
Jun 11
Tom McKinnon replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"Craig, Thanks for the detailed explanation.  A few questions: 1.  Do you ever consider the built-in BEC on an ESC to be a reliable supply?  Or is the environment of the ESC (heat, etc) just a bad place to put a mission-critical piece…"
Jun 11

3D Robotics
Craig Elder replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"with 15cm leads is almost pointless to have the cap at all."
Jun 11
Tom McKinnon replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"Yes, I found that the wire length is very important.  First I used a large cap with long leads (15 cm or so) but I found that a 680 uF/10V with leads about 2 cm did a better job."
Jun 11

3D Robotics
Craig Elder replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"I can't really comment on the size of the cap.  If you have 100uF, just make sure the power supply can source the current to charge it. Also you need to keep the cap as close to the Pixhawk as possible. you could use another servo…"
Jun 11
iskess replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"Ok, I found a 1000uF 10v Low ESR capacitor and soldered like in the photo. How's this look?"
Jun 11
iskess replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"Which capacitor would you recommend? Could it be installed along side the zener in parallel?"
Jun 11

3D Robotics
Craig Elder replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"If you are using the PM and the servo rail as a backup, you need to keep the servo rail below 5.7V.  If you are attaching 5V servos you must use a zener as the noise levels from the servos will exceed 5.7V.  Adding a cap is a good idea…"
Jun 11
Tom McKinnon replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"We have both the 3DR power module and a separate BEC powering the rail.  Since the power module is rated at 2.25A I'm assuming that the power switchover controller rolls to the the BEC right away.  I have a separate BEC on some of our…"
Jun 11
Tom McKinnon replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"Thanks.  I'll put 1N5339 zeners on our Pixhawks.  Since the knee of this diode is at 5.6V I assume this means that the 5.4V spikes I'm seeing are not causing problems.  Correct?"
Jun 11
Keith Geary replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"Hi Tom, I assume you're not using a 3DR power module, but powering the PixHawks directly from the ESC or an external BEC? As Hugues stated there is information about how to use a zenar diode on the Wiki Site PixHawk wiring Best Regards, Keith,"
Jun 11
iskess replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"Yes, a zener acts as a voltage regulator. Lots of youtube tutorials with Indian accents :) Mine is heating up very fast, so im not sure what im doing wrong."
Jun 10
Hans Miller replied to Tom McKinnon's discussion Acceptable level of noise on the servo +5V rail? in the group ArduPlane User Group
"Never mind, I wrote before thinking. Sorry."
Jun 10

Profile Information

About Me:
Founder, Agribotix LLC
Please tell us a bit about your UAV interest
Agriculture, Wildlife conservation.
Hometown:
Boulder

Tom McKinnon's Blog

Over-glacier UAV flights in New Zealand to create digital elevation models

Posted on March 20, 2014 at 12:00am 10 Comments

The Agribotix team is in New Zealand, flying our UAVs over Tasman Glacier to help researchers at Victoria University of Wellington make a digital elevation model of the glacier. Today, we flew the twin boom Sky Hunter over 100km in transects across the glacier. We've mounted a downward facing camera in the fuselage, which takes photos every 3 seconds. Using these photos, and…

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