Donny
Donny
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  • Tallahassee, FL
  • United States
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Donny's Discussions

sensors

Started this discussion. Last reply by Donny Jul 14, 2010. 2 Replies

programmable servo

Started this discussion. Last reply by Chris Anderson Jul 14, 2010. 5 Replies

Active Stabilization

Started this discussion. Last reply by Donny Jun 15, 2010. 10 Replies

 

Donny's Page

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Donny replied to Donny's discussion 'sensors'
The gyros are subject to drift as well so I'll have to use IR sensors. As for re-working the control loop; I'm looking to build a proof of concept first and would prefer to rework as little as possible. I do moving the center of mass…
Jul 14, 2010
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Chris Anderson replied to Donny's discussion 'programmable servo'
I stand corrected! Thanks, Jason.
Jul 14, 2010
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jasonshort replied to Donny's discussion 'sensors'
If this is a rocket, the IMU might not be able to withstand the G forces. An IR sensor would work fine however. If you reworked the control loop you could get a much faster response than 50 hz.
Jul 14, 2010
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jasonshort replied to Donny's discussion 'programmable servo'
Ardupilot has slew rate limiting implemented for all of the servos. Just put degrees per second into your PID file.
Jul 14, 2010
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Serge replied to Donny's discussion 'programmable servo'
Hi Donny, if you want slower movement of your servo (not faster), you can chop the total servo throw up in smaller steps. Every loop of the software will then move the servo a little bit until it reaches the desired position. Cheers
Jul 14, 2010
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Discussions posted by Donny Jul 14, 2010
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Donny replied to Donny's discussion 'programmable servo'
Thanks Chris!
Jul 13, 2010
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Chris Anderson replied to Donny's discussion 'programmable servo'
ArduPilot, like all consumer-grade autopilots, uses regular RC servos. They can control how far they move (degrees) but not how fast.
Jul 13, 2010
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Donny replied to Donny's discussion 'Active Stabilization'
Very helpful, Thanks. I'm planning to buy this glider for the flight and I suppose I'll tackle ardupilot in the coming weeks. I'm doing a flight test on the new arduino based telemetry system in the next week or two so I'll want…
Jun 15, 2010
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Michael Zaffuto replied to Donny's discussion 'Active Stabilization'
An AoA sensor was previously discussed briefly and resulted in this link to Charles River's Albatross This is his schematic: http://www.charlesriverrc.org/articles/asfwpp/lelke_alb1electronics.htm This is his AoA Sensor:…
Jun 15, 2010
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Chris Anderson replied to Donny's discussion 'Active Stabilization'
Good point. If you can't power on the IMU on the ground, you will indeed be better off with thermopiles (which were actually designed by NASA to work in space!). And yes, in your application you will need a Z. I'm afraid we only sell them…
Jun 15, 2010
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Donny replied to Donny's discussion 'Active Stabilization'
I did mean the Z sensor. My concer with the ArduIMU is that is uses gyros in place of thermopile sensors. My glider will be launched from a high altitude balloon. This means the glider will not be motionless when ardupilot is powered on. It's…
Jun 15, 2010
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bGatti replied to Donny's discussion 'Active Stabilization'
I suspect that you would find airspeed to be a sufficient indicator of "angle of attack". if you target an ideal cruising speed, and pull up when faster or drop the nose when slower, you should be able to use the existing airspeed…
Jun 15, 2010
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Chris Anderson replied to Donny's discussion 'Active Stabilization'
I don't think you can reliably set a specific angle off level with the thermopiles. They're designed as levelers, not for accurate bank or pitch angle. (Depends on calibration, etc). That's why I recommended using it with ArduIMU,…
Jun 15, 2010
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Donny replied to Donny's discussion 'Active Stabilization'
Cool. Thanks. I think I'll just get the ardupilot board. I happen to have the two axis thermopile sensors Can you buy the Y sensor separately by chance somewhere?
Jun 15, 2010
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Chris Anderson replied to Donny's discussion 'Active Stabilization'
Yes, ArduPilot (with ArduIMU) or ArduPilot Mega can do that. You'll have to tweak the code a bit, but it's not hard.
Jun 15, 2010

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