remote control solution needed

remote control solution needed

Post by LTek » Thu, 08 Jun 2000 04:00:00



Hi,

I am working on a project which requires two motors to have remote speed
control, forward and reverse.

I went to the local hobby shop to ask them if there was any way to use a
standard RC system to just control two DC motors.  "I don't know anything about
the remote control stuff we sell."

So:  I need two motors.  And I need two joysticks, one to control each motor.
Up should be one direction, down should be the other.  And it should all be
variable speed.

This seems like a pretty simple request, but for one who has no experience in
the RC world, it's a bit more daunting.

Can anyone help?

:Lee

 
 
 

remote control solution needed

Post by Dennis Clar » Thu, 08 Jun 2000 04:00:00


Quote:

> Hi,
> I am working on a project which requires two motors to have remote speed
> control, forward and reverse.
> So:  I need two motors.  And I need two joysticks, one to control each motor.
> Up should be one direction, down should be the other.  And it should all be
> variable speed.
> This seems like a pretty simple request, but for one who has no experience in
> the RC world, it's a bit more daunting.

  What is your budget?  This is trivial if you want to buy two reversing
ESCs and a four channel ground (75MHz) radio.  It'll be about $200 with
this setup.  An ESC acts takes the same receiver signal as a servo, wherever
you can plug a servo, you can put an ESC.  The most reasonable 4 channel
75MHz radio you will find is the Hitec one, all the other companies will
require you to send it back to the factory for retuning, the Hitec one is
available "off the shelf".

DLC
--
---------------------------------------------------------------------
* Dennis Clark    Mechanical Engineering    Behavior Based Robotics *

---------------------------------------------------------------------

 
 
 

remote control solution needed

Post by P. Campbe » Fri, 09 Jun 2000 04:00:00


Quote:


>> Hi,

>> I am working on a project which requires two motors to have remote speed
>> control, forward and reverse.

>> So:  I need two motors.  And I need two joysticks, one to control each
>> motor.  Up should be one direction, down should be the other.  And it
>> should all be variable speed.
>> This seems like a pretty simple request, but for one who has no experience
>> in the RC world, it's a bit more daunting.

   $200 ! Find an old twin-stick radio , and rotate the steering pot to go
 up and down . Buy two resistor/wiper MSC's , and two basic servo's , and
 presto . You can do this for $50 or less . What the f*ck does he need a 4ch
 for ? or ESC's ... overkill , over-price .

                                                          The White Wolf

Quote:
>   What is your budget?  This is trivial if you want to buy two reversing
> ESCs and a four channel ground (75MHz) radio.  It'll be about $200 with
> this setup.  An ESC acts takes the same receiver signal as a servo, wherever
> you can plug a servo, you can put an ESC.  The most reasonable 4 channel
> 75MHz radio you will find is the Hitec one, all the other companies will
> require you to send it back to the factory for retuning, the Hitec one is
> available "off the shelf".

> DLC
> --
> ---------------------------------------------------------------------
> * Dennis Clark    Mechanical Engineering    Behavior Based Robotics *

> ---------------------------------------------------------------------

--
 *                Knowing when to abandon those who care                    *
 * *                 too little or too much about themselves              * *
 * * * *                                                              * * * *
 * * * * * *            * -  The Great White Wolf  - *            * * * * * *
 
 
 

remote control solution needed

Post by burnt-ka » Fri, 09 Jun 2000 04:00:00


Wolfman- check your email...

--


AIM- RCburntkat
ICQ- 37321195
http://burnt-kat.streetracing.org/index.html - work in progress


Quote:


> >> Hi,

> >> I am working on a project which requires two motors to have remote
speed
> >> control, forward and reverse.

> >> So:  I need two motors.  And I need two joysticks, one to control each
> >> motor.  Up should be one direction, down should be the other.  And it
> >> should all be variable speed.
> >> This seems like a pretty simple request, but for one who has no
experience
> >> in the RC world, it's a bit more daunting.

>    $200 ! Find an old twin-stick radio , and rotate the steering pot to go
>  up and down . Buy two resistor/wiper MSC's , and two basic servo's , and
>  presto . You can do this for $50 or less . What the f*ck does he need a
4ch
>  for ? or ESC's ... overkill , over-price .

>                                                           The White Wolf

> >   What is your budget?  This is trivial if you want to buy two reversing
> > ESCs and a four channel ground (75MHz) radio.  It'll be about $200 with
> > this setup.  An ESC acts takes the same receiver signal as a servo,
wherever
> > you can plug a servo, you can put an ESC.  The most reasonable 4 channel
> > 75MHz radio you will find is the Hitec one, all the other companies will
> > require you to send it back to the factory for retuning, the Hitec one
is
> > available "off the shelf".

> > DLC
> > --
> > ---------------------------------------------------------------------
> > * Dennis Clark    Mechanical Engineering    Behavior Based Robotics *

> > ---------------------------------------------------------------------

> --
>  *                Knowing when to abandon those who care
*
>  * *                 too little or too much about themselves
* *
>  * * * *                                                              * *
* *
>  * * * * * *            * -  The Great White Wolf  - *            * * * *

* *
 
 
 

remote control solution needed

Post by Dennis Clar » Fri, 09 Jun 2000 04:00:00


Quote:



> >> Hi,
> >> I am working on a project which requires two motors to have remote speed
> >> control, forward and reverse.

> >> So:  I need two motors.  And I need two joysticks, one to control each
> >> motor.  Up should be one direction, down should be the other.  And it
> >> should all be variable speed.
>    $200 ! Find an old twin-stick radio , and rotate the steering pot to go
>  up and down . Buy two resistor/wiper MSC's , and two basic servo's , and
>  presto . You can do this for $50 or less . What the f*ck does he need a 4ch
>  for ? or ESC's ... overkill , over-price .
>                                                           The White Wolf

  Gee, sorry to tweak your nose.  Most folk who are doing a remote unit want
to do more than just drive it, they want to have a couple more functions and
they want to carry a bit of weight.  It was also understood (I hope) that I
was talking new unit price, used is usually less.

  Now, to expand on Mr. Wolf's explosive tirade, indeed, you can build a very
small differential drive unit with a cheap two stick radio (one stick won't
return to center) and two generic servos.  You can then hack the servos for
continuous rotation and attach wheels to the servo horns.  Rotate the right
side stick on the transmitter for forward-back usage and flick the servo
reverse on it.  You now have a small, simple two motor design for the cost
of a two stick two channel radio with 2 servos.  It won't do anything else
though.

DLC

Quote:
> >   What is your budget?  This is trivial if you want to buy two reversing
> > ESCs and a four channel ground (75MHz) radio.  It'll be about $200 with
> > this setup.  An ESC acts takes the same receiver signal as a servo, wherever
> > you can plug a servo, you can put an ESC.  The most reasonable 4 channel
> > 75MHz radio you will find is the Hitec one, all the other companies will
> > require you to send it back to the factory for retuning, the Hitec one is
> > available "off the shelf".

> > DLC
> > --
> > ---------------------------------------------------------------------
> > * Dennis Clark    Mechanical Engineering    Behavior Based Robotics *

> > ---------------------------------------------------------------------
> --
>  *                Knowing when to abandon those who care                    *
>  * *                 too little or too much about themselves              * *
>  * * * *                                                              * * * *
>  * * * * * *            * -  The Great White Wolf  - *            * * * * * *

--
---------------------------------------------------------------------
* Dennis Clark    Mechanical Engineering    Behavior Based Robotics *

---------------------------------------------------------------------
 
 
 

remote control solution needed

Post by DDM » Fri, 09 Jun 2000 04:00:00


I believe you are looking for 2 axis bi-directional control.  This can be had with
a 2 channel radio system (stick or wheel depending on application) a receiver and 2
reversible Electronic Speed controls.  For your purpose, top speed of the drive
motors is probably not a big issue, so 2 low end ESCs will do, look at duratrax,
around $40 a piece.  2 channel systems run $50 to $100 depending on how fancy you
need.

The only possible problem I can see with this setup would be plugging 2 ESCs into
one Rx, since BOTH will be supplying power.  You may have to do a little rewiring
and remove the voltage regulator from 1 Speed control.

Good luck

DDM

Quote:

> Hi,

> I am working on a project which requires two motors to have remote speed
> control, forward and reverse.

> I went to the local hobby shop to ask them if there was any way to use a
> standard RC system to just control two DC motors.  "I don't know anything about
> the remote control stuff we sell."

> So:  I need two motors.  And I need two joysticks, one to control each motor.
> Up should be one direction, down should be the other.  And it should all be
> variable speed.

> This seems like a pretty simple request, but for one who has no experience in
> the RC world, it's a bit more daunting.

> Can anyone help?

> :Lee


 
 
 

remote control solution needed

Post by Mike » Fri, 09 Jun 2000 04:00:00


(snip)

Quote:
>  Now, to expand on Mr. Wolf's explosive tirade, indeed, you can build a very
> small differential drive unit with a cheap two stick radio (one stick won't
> return to center) and two generic servos.  You can then hack the servos for
> continuous rotation and attach wheels to the servo horns.  Rotate the right
> side stick on the transmitter for forward-back usage and flick the servo
> reverse on it.  You now have a small, simple two motor design for the cost
> of a two stick two channel radio with 2 servos.  It won't do anything else
> though.

Thats an interesting thought - modifying the servo to act as the drive motor and
gearbox. I'd try it on a cheapie servo first, then, if it works, a big hi-torq
servo. If the intended purpose is like a robot or toy tank, it might work very well.

If the modified servo/drive works, you would need:
a two stick radio with reciever & battery - $55
Two big hi-torq servos. (size probably depends on application) - about $40 each
no esc's
no additional motors.
no additional battery pack
By the way, on the old Futaba Attack two-stick radio, you could unscrew the gimbals
and reinstall them as left-right or up-down. I dont know if the new ones are the
same.

get a 4-channel only if necessary. example: for a tank, you need 1 channel for each
track, one to rotate the turret, and one to fire the gun. (now were havin fun!)

 
 
 

remote control solution needed

Post by Dennis Clar » Fri, 09 Jun 2000 04:00:00


Quote:

> (snip)
> >  Now, to expand on Mr. Wolf's explosive tirade, indeed, you can build a very
> > small differential drive unit with a cheap two stick radio (one stick won't
> > return to center) and two generic servos.  You can then hack the servos for
> > continuous rotation and attach wheels to the servo horns.  Rotate the right
> > side stick on the transmitter for forward-back usage and flick the servo
> > reverse on it.  You now have a small, simple two motor design for the cost
> > of a two stick two channel radio with 2 servos.  It won't do anything else
> > though.
> Thats an interesting thought - modifying the servo to act as the drive motor and
> gearbox. I'd try it on a cheapie servo first, then, if it works, a big hi-torq
> servo. If the intended purpose is like a robot or toy tank, it might work very well.
> If the modified servo/drive works, you would need:

  It works fine, I've done it on every brand of servo out there.  Futaba is
the easiest, snip the end stop off of the spline gear and remove the plastic
pot-registration insert up inside the spline gear and you're done.  On the
low end servos (S3003, HS303, etc) you'll get about 6 speeds forward and
reverse, most speeds are pretty close to the center position.  I regularly
run 2 to 3 pound robots around with 3003 servos, run them at 12V and they
get up and move too (for a robot that is.)!  For my 20 pounder though I am
using a Vantec unit (about $260) because it can handle high current, high
voltage motors and supports programmable trapazoidal acceleration curves.

have fun,
DLC
--
---------------------------------------------------------------------
* Dennis Clark    Mechanical Engineering    Behavior Based Robotics *

---------------------------------------------------------------------

 
 
 

remote control solution needed

Post by Mike » Sat, 10 Jun 2000 04:00:00


Oh. (says mike just noticing dennis's footnote) Guess you probably know what yer talkin
about.
Quote:
>   It works fine, I've done it on every brand of servo out there.  Futaba is
> the easiest, snip the end stop off of the spline gear and remove the plastic
> pot-registration insert up inside the spline gear and you're done.  On the
> low end servos (S3003, HS303, etc) you'll get about 6 speeds forward and
> reverse, most speeds are pretty close to the center position.  I regularly
> run 2 to 3 pound robots around with 3003 servos, run them at 12V and they
> get up and move too (for a robot that is.)!  For my 20 pounder though I am
> using a Vantec unit (about $260) because it can handle high current, high
> voltage motors and supports programmable trapazoidal acceleration curves.

> have fun,
> DLC
> --
> ---------------------------------------------------------------------
> * Dennis Clark    Mechanical Engineering    Behavior Based Robotics *

> ---------------------------------------------------------------------

 
 
 

remote control solution needed

Post by SBlackfoo » Sat, 10 Jun 2000 04:00:00


In that situation all he would have to do is remove one of the positive pins
from it's connector and insulate it on either ESC's receiver plug. Easy.


Quote:
> I believe you are looking for 2 axis bi-directional control.  This can be
had with
> a 2 channel radio system (stick or wheel depending on application) a
receiver and 2
> reversible Electronic Speed controls.  For your purpose, top speed of the
drive
> motors is probably not a big issue, so 2 low end ESCs will do, look at
duratrax,
> around $40 a piece.  2 channel systems run $50 to $100 depending on how
fancy you
> need.

> The only possible problem I can see with this setup would be plugging 2
ESCs into
> one Rx, since BOTH will be supplying power.  You may have to do a little
rewiring
> and remove the voltage regulator from 1 Speed control.

> Good luck

> DDM


> > Hi,

> > I am working on a project which requires two motors to have remote speed
> > control, forward and reverse.

> > I went to the local hobby shop to ask them if there was any way to use a
> > standard RC system to just control two DC motors.  "I don't know
anything about
> > the remote control stuff we sell."

> > So:  I need two motors.  And I need two joysticks, one to control each
motor.
> > Up should be one direction, down should be the other.  And it should all
be
> > variable speed.

> > This seems like a pretty simple request, but for one who has no
experience in
> > the RC world, it's a bit more daunting.

> > Can anyone help?

> > :Lee