DPRG mailing list archives: [DPRG] R/C heli technology

Mon Jun 11 16:39:42 CDT 2007

Hi Dennis,

thay won't work for a two-wheel balancing robot.  Need to be able to
seamlessly go between forward and reverse in order to balance.

On a related note, I think we could get a gasoline powered two-wheel
balancer to work if we used a hydrostatic motor to drive the wheels,
like this:

<http://www.hydrogear.com/LawnGard/Motors.aspx>

cheers,
dpa

> 
> Go Ackerman!  Run the speed motor forward and use the blade pitch control to
> control the steering motor.  Sounds like this approach would work on a
> standard RC car/truck -- as long as you don't steer yourself into a dead
> end!  :)
> 
> Dennis
> 
> On 6/11/07, dpa <dpa at io.isem.smu.edu> wrote:
> >
> > Howdy,
> >
> > Did my first hover today with my new helicopter, (a TREX-450 with a
> > Spektrum DX7 radio, for those in-the-know :)
> >
> > This is some seriously cool technology.  The gyro itelf is about the
> > size of a nickle, and includes an 8-led "level meter" with 5 green
> > leds for programming modes and a push button for user input!  The
> > motor is brushless with a very nifty speed controller that uses sound
> > output for programming feedback and the R/C link for programming input,
> > all based on timing, for things like slew rates, gain controls,
> > and gain limits.  Extremely nice.
> >
> > The whole thing lights up like a Christmas tree and sings like R2-D2
> > during powerup.  I love it!
> >
> > The heli uses a 2200 mAh 11.7v LiPo battery pack about the size
> > of a small Snickers candybar, that charges in just one hour.
> >
> > Once again I think we robot folks have a great ally in the R/C car/
> > plane and now helicopter crowd.  Seems like one of these "heading
> > hold" gyros might be just the ticket for odometry+gyro robot
> > navigation, indoors or ourdoors.
> >
> > Does anyone know of a brushless speed controller that can be reversed?
> >
> > The helicopter, of course, just runs the motor in one direction and
> > reverses the pitch of the blades, but a robot needs to be able to
> > reverse its motors in software.  The speed controller has three
> > leads and reversing any two of them reverse the direction of the
> > motor.  That suggests that it would not be difficult to build a
> > controller that can reverse the motor.  Anybody know if such a
> > thing exists?
> >
> > best,
> > dpa
> >
> > _______________________________________________
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> > http://list.dprg.org/mailman/listinfo/dprglist
> >
> 
> 
> 
> -- 
> Dennis
> 
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> Go Ackerman!&nbsp; Run the speed motor forward and use the blade pitch control to control the steering motor.&nbsp; Sounds like this approach would work on a standard RC car/truck -- as long as you don&#39;t steer yourself into a dead end!&nbsp; :)
> <br><br>Dennis<br><br><div><span class="gmail_quote">On 6/11/07, <b class="gmail_sendername">dpa</b> &lt;<a href="mailto:dpa at io.isem.smu.edu">dpa at io.isem.smu.edu</a>&gt; wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
> Howdy,<br><br>Did my first hover today with my new helicopter, (a TREX-450 with a<br>Spektrum DX7 radio, for those in-the-know :)<br><br>This is some seriously cool technology.&nbsp;&nbsp;The gyro itelf is about the<br>size of a nickle, and includes an 8-led &quot;level meter&quot; with 5 green
> <br>leds for programming modes and a push button for user input!&nbsp;&nbsp;The<br>motor is brushless with a very nifty speed controller that uses sound<br>output for programming feedback and the R/C link for programming input,<br>
> all based on timing, for things like slew rates, gain controls,<br>and gain limits.&nbsp;&nbsp;Extremely nice.<br><br>The whole thing lights up like a Christmas tree and sings like R2-D2<br>during powerup.&nbsp;&nbsp;I love it!<br><br>The heli uses a 2200 mAh 
> 11.7v LiPo battery pack about the size<br>of a small Snickers candybar, that charges in just one hour.<br><br>Once again I think we robot folks have a great ally in the R/C car/<br>plane and now helicopter crowd.&nbsp;&nbsp;Seems like one of these &quot;heading
> <br>hold&quot; gyros might be just the ticket for odometry+gyro robot<br>navigation, indoors or ourdoors.<br><br>Does anyone know of a brushless speed controller that can be reversed?<br><br>The helicopter, of course, just runs the motor in one direction and
> <br>reverses the pitch of the blades, but a robot needs to be able to<br>reverse its motors in software.&nbsp;&nbsp;The speed controller has three<br>leads and reversing any two of them reverse the direction of the<br>motor.&nbsp;&nbsp;That suggests that it would not be difficult to build a
> <br>controller that can reverse the motor.&nbsp;&nbsp;Anybody know if such a<br>thing exists?<br><br>best,<br>dpa<br><br>_______________________________________________<br>DPRGlist mailing list<br><a href="mailto:DPRGlist at dprg.org">
> DPRGlist at dprg.org</a><br><a href="http://list.dprg.org/mailman/listinfo/dprglist">http://list.dprg.org/mailman/listinfo/dprglist</a><br></blockquote></div><br><br clear="all"><br>-- <br>Dennis
> 
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