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EdwinP0
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IR Drop
EdwinP0   9/19/2013 12:40:46 PM
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It seems there is some time before the quadcopter decides it is dead.  Can you control the power supply to raise the voltage as a function of the current (and resistence) so that the voltage at the quadcopter is constant (e.g. not at the power supply).

 

Randa11
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Re: IR Drop
Randa11   9/19/2013 3:54:41 PM
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Get a bench power supply with sense leads.

You know how bench supplies always have two positive terminals and two negative terminals, and they're always coupled with big (E on its side shaped) shorting links. Well if you remove the shorts, then, run your two thick wires out to the load and two thin wires back to the sense inputs, the power supply will automatically compensate for the voltage drop in the thicker wires.

ShawnHymel
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Re: IR Drop
ShawnHymel   9/19/2013 8:29:12 PM
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We actually discussed having a supply change its voltage to accommodate the large drop depending on the current. While it should work, Tara and Sean had limited time during their hacker-in-residence stay.

Robotics Developer
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Re: IR Drop
Robotics Developer   9/19/2013 9:33:25 PM
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Another option would have been to supply a higher than needed voltage and provide on board voltage regulation.  This would avoid the 4 wire remote sensing and still enable full votage/current at the copter.

HeyJoe0
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Re: IR Drop
HeyJoe0   9/19/2013 11:01:46 PM
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I agree with running a local regulator and feeding higher voltage. You could also run much thinner wire and the flight dynamics will respond closer to the final untethered version. 

Caleb Kraft
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Re: IR Drop
Caleb Kraft   9/20/2013 8:47:17 AM
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yeah, one week is hardly enough time to recognize the issue and come up with a prototype, much less refine it.

Caleb Kraft
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Re: IR Drop
Caleb Kraft   9/20/2013 8:49:56 AM
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that's a pretty good idea!

Caleb Kraft
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Re: IR Drop
Caleb Kraft   9/20/2013 8:50:45 AM
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that's a pretty good idea!

Robotics Developer
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Re: IR Drop
Robotics Developer   9/20/2013 8:37:32 PM
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I would say that a week is not enough time to do much and they at least got something accomplished.  If I were to revisit that effort I would have suggested building a larger quad-copter with greater lift and larger battery options.  The tether is a great starter for debug but not a real long term solution, the full benefits of a copter can only be realized un-tethered.

Robotics Developer
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Re: IR Drop
Robotics Developer   9/20/2013 8:38:18 PM
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I would say that a week is not enough time to do much and they at least got something accomplished.  If I were to revisit that effort I would have suggested building a larger quad-copter with greater lift and larger battery options.  The tether is a great starter for debug but not a real long term solution, the full benefits of a copter can only be realized un-tethered.

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