DC Motor control
Archiver
Posts: 46,084
Hello,
I just found basicstamps - absolute newbie.
we are searching for a DC motor control to set the position of a
linear screw drive.
Has anybody done/tried this with BASIC Stamps ?
Our screw so far is driven by a Maxon DC Motor RE35 90W (12V) and a
HP HEDS 5540 Digital Encoder. A 0.52 volt output / 1000rpm DC tacho
is available too.
At least we want to control the bidirectional position not the speed.
The periodic movement of the
screw is a sinus over 0..50 cm. Motor needs average 200 rounds per
second.
We are connecting to a IBM compatible PC with RS232 and Visual Basic
program running,
so we need a speedy controller in between.
Thank you
Dirk
I just found basicstamps - absolute newbie.
we are searching for a DC motor control to set the position of a
linear screw drive.
Has anybody done/tried this with BASIC Stamps ?
Our screw so far is driven by a Maxon DC Motor RE35 90W (12V) and a
HP HEDS 5540 Digital Encoder. A 0.52 volt output / 1000rpm DC tacho
is available too.
At least we want to control the bidirectional position not the speed.
The periodic movement of the
screw is a sinus over 0..50 cm. Motor needs average 200 rounds per
second.
We are connecting to a IBM compatible PC with RS232 and Visual Basic
program running,
so we need a speedy controller in between.
Thank you
Dirk
Comments
I am using such a device to control a waveguide attenuator. The attenuator
has a slug that is pushed in and out of the waveguide with a linear
ball-screw positioner which is driven by a 12 volt motor. On the end of the
shaft, I have a 10 turn potentiometer which is read by the control computer.
Cheaper than the encoder method and easier to program as well with a stamp.
We even do hysteresis to eliminate the backlash and play of the ball screw.
Will maximum travel be reached within 10 rotations of the screw? If you need
more rotations, then the encoder method would be the only way. If you want
more info or ideas, please email back.
Good luck,
Gary
g.shearer@v...
Free Electron Laser Research Center
Vanderbilt University
Nashville, Tennessee
Original Message
From: "Dirk Robert Kuhlmann" <kuhlmannd@i...>
To: <basicstamps@egroups.com>
Sent: Wednesday, August 30, 2000 4:35 PM
Subject: [noparse][[/noparse]basicstamps] DC Motor control
> Hello,
>
> I just found basicstamps - absolute newbie.
>
> we are searching for a DC motor control to set the position of a
> linear screw drive.
> Has anybody done/tried this with BASIC Stamps ?
>
> Our screw so far is driven by a Maxon DC Motor RE35 90W (12V) and a
> HP HEDS 5540 Digital Encoder. A 0.52 volt output / 1000rpm DC tacho
> is available too.
>
> At least we want to control the bidirectional position not the speed.
> The periodic movement of the
> screw is a sinus over 0..50 cm. Motor needs average 200 rounds per
> second.
>
> We are connecting to a IBM compatible PC with RS232 and Visual Basic
> program running,
> so we need a speedy controller in between.
>
> Thank you
> Dirk
>
>
>
>
>
unfortunately I need 200 rounds to the end of my linear
ball-screw positioner and this 50cm long potentiometers are quite
expensive.
As I am no elektronik engineer but an IS guy must a regulator be
realised for that or did you tried these third party products like Motor
Mind B ?
So far I got, that the memory of a stamp is low limited and I ask myself, if
it's
possible (memory and speed) with this nice part.
Do you know how to put an encoder electronic to the stamp.
best regards
Dirk
Original Message
From: "G. Shearer" <g.shearer@v...>
To: <basicstamps@egroups.com>
Sent: Friday, September 01, 2000 7:37 AM
Subject: Re: [noparse][[/noparse]basicstamps] DC Motor control
> Dirk,
>
> I am using such a device to control a waveguide attenuator. The attenuator
> has a slug that is pushed in and out of the waveguide with a linear
> ball-screw positioner which is driven by a 12 volt motor. On the end of
the
> shaft, I have a 10 turn potentiometer which is read by the control
computer.
> Cheaper than the encoder method and easier to program as well with a
stamp.
> We even do hysteresis to eliminate the backlash and play of the ball
screw.
> Will maximum travel be reached within 10 rotations of the screw? If you
need
> more rotations, then the encoder method would be the only way. If you want
> more info or ideas, please email back.
>
> Good luck,
> Gary
>
> g.shearer@v...
> Free Electron Laser Research Center
> Vanderbilt University
> Nashville, Tennessee
>
>
Original Message
> From: "Dirk Robert Kuhlmann" <kuhlmannd@i...>
> To: <basicstamps@egroups.com>
> Sent: Wednesday, August 30, 2000 4:35 PM
> Subject: [noparse][[/noparse]basicstamps] DC Motor control
>
>
> > Hello,
> >
> > I just found basicstamps - absolute newbie.
> >
> > we are searching for a DC motor control to set the position of a
> > linear screw drive.
> > Has anybody done/tried this with BASIC Stamps ?
> >
> > Our screw so far is driven by a Maxon DC Motor RE35 90W (12V) and a
> > HP HEDS 5540 Digital Encoder. A 0.52 volt output / 1000rpm DC tacho
> > is available too.
> >
> > At least we want to control the bidirectional position not the speed.
> > The periodic movement of the
> > screw is a sinus over 0..50 cm. Motor needs average 200 rounds per
> > second.
> >
> > We are connecting to a IBM compatible PC with RS232 and Visual Basic
> > program running,
> > so we need a speedy controller in between.
> >
> > Thank you
> > Dirk
> >
> >
> >
> >
> >
>
>
>
>
>
>unfortunately I need 200 rounds to the end of my linear
>ball-screw positioner and this 50cm long potentiometers are quite
>expensive.
Can you replace the DC motor with a stepper? This would make very accurate
positioning simple to do with a stamp. Then it's just a matter of saying
"go 500 steps forward" and it will hit it's mark every time. Just a thot...
Duncan
> linear screw drive.
> Has anybody done/tried this with BASIC Stamps ?
>
> Our screw so far is driven by a Maxon DC Motor RE35 90W (12V) and a
> HP HEDS 5540 Digital Encoder. A 0.52 volt output / 1000rpm DC tacho
> is available too.
>
The best option is probably the use of a dedicated chipset. Take a look at
www.jrkerr.com , look under ic-products. They sell a chipset for this. You
link the encoder and motor to the chipset and then you can control it using
a serial link.
I also think that a stepper would be good, considering the ball screw has
very little drag which would cause a stepper to skip. That aside, one could
simply count and output steps to the stepper motor controller (clock signal)
but one should also have some type of reference which could be an
opto-interrupter at the end of travel. I have some circuits for driving a
stepper motor and software too at:
www.microcontrollertricks.cjb.net
My example is for a PIC 16F84 but the same logic can also be used to write a
stamp program ( I did all my original research on a stamp and will have to
put the stamp program up on the web site as soon as I have time)
Hope this helps,
Gary
g.shearer@v...
Free Electron Laser Research Center
Vanderbilt University
Nashville, Tennessee
Original Message
From: <orthner@s...>
To: <basicstamps@egroups.com>
Sent: Friday, September 01, 2000 9:14 AM
Subject: Re: [noparse][[/noparse]basicstamps] DC Motor control
> At 08:29 AM 9/1/00 +0200, you wrote:
>
> >
> >unfortunately I need 200 rounds to the end of my linear
> >ball-screw positioner and this 50cm long potentiometers are quite
> >expensive.
>
> Can you replace the DC motor with a stepper? This would make very accurate
> positioning simple to do with a stamp. Then it's just a matter of saying
> "go 500 steps forward" and it will hit it's mark every time. Just a
thot...
>
> Duncan
>
>
>
>
Gary
Original Message
From: "Thierry Vanmarcke" <tvm@p...>
To: <basicstamps@egroups.com>
Sent: Saturday, September 02, 2000 12:25 AM
Subject: Re: [noparse][[/noparse]basicstamps] DC Motor control
> > we are searching for a DC motor control to set the position of a
> > linear screw drive.
> > Has anybody done/tried this with BASIC Stamps ?
> >
> > Our screw so far is driven by a Maxon DC Motor RE35 90W (12V) and a
> > HP HEDS 5540 Digital Encoder. A 0.52 volt output / 1000rpm DC tacho
> > is available too.
> >
>
> The best option is probably the use of a dedicated chipset. Take a look at
> www.jrkerr.com , look under ic-products. They sell a chipset for this. You
> link the encoder and motor to the chipset and then you can control it
using
> a serial link.
>
>
>
>
> we are searching for a DC motor control to set the position of a
> linear screw drive.
> Has anybody done/tried this with BASIC Stamps ?
>
> Our screw so far is driven by a Maxon DC Motor RE35 90W (12V) and a
> HP HEDS 5540 Digital Encoder. A 0.52 volt output / 1000rpm DC tacho
> is available too.
For driving a DC motor with an encoder an excellent dedicated chip is
national's LM628/629. This thing is basically a motion control system on a
chip. You connect the motor and encoder to it, then send it data. It can be
set up for position/velocity and does PID on the fly to generate it's own
trajectory profile. I've never used this with a stamp, but it should be
possible.
Duncan
stepper motor. The stepper motors cost $60 max each and it is easy for the
stamp to control the stepper. Position is recognized by the number of steps
and in which direction. There should also be a home position indicator ie.
optointerruptor. You can get some ideas from my web site at:
www.microcontrollertricks.cjb.net
Let me know if you need any further help.
Gary
Original Message
From: "Dirk R. Kuhlmann" <kuhlmannd@i...>
To: <basicstamps@egroups.com>
Sent: Friday, September 01, 2000 1:29 AM
Subject: Re: [noparse][[/noparse]basicstamps] DC Motor control
> Thanks Gary,
>
> unfortunately I need 200 rounds to the end of my linear
> ball-screw positioner and this 50cm long potentiometers are quite
> expensive.
>
> As I am no elektronik engineer but an IS guy must a regulator be
> realised for that or did you tried these third party products like Motor
> Mind B ?
>
> So far I got, that the memory of a stamp is low limited and I ask myself,
if
> it's
> possible (memory and speed) with this nice part.
>
> Do you know how to put an encoder electronic to the stamp.
>
> best regards
>
> Dirk
>
>
Original Message
> From: "G. Shearer" <g.shearer@v...>
> To: <basicstamps@egroups.com>
> Sent: Friday, September 01, 2000 7:37 AM
> Subject: Re: [noparse][[/noparse]basicstamps] DC Motor control
>
>
> > Dirk,
> >
> > I am using such a device to control a waveguide attenuator. The
attenuator
> > has a slug that is pushed in and out of the waveguide with a linear
> > ball-screw positioner which is driven by a 12 volt motor. On the end of
> the
> > shaft, I have a 10 turn potentiometer which is read by the control
> computer.
> > Cheaper than the encoder method and easier to program as well with a
> stamp.
> > We even do hysteresis to eliminate the backlash and play of the ball
> screw.
> > Will maximum travel be reached within 10 rotations of the screw? If you
> need
> > more rotations, then the encoder method would be the only way. If you
want
> > more info or ideas, please email back.
> >
> > Good luck,
> > Gary
> >
> > g.shearer@v...
> > Free Electron Laser Research Center
> > Vanderbilt University
> > Nashville, Tennessee
> >
> >
Original Message
> > From: "Dirk Robert Kuhlmann" <kuhlmannd@i...>
> > To: <basicstamps@egroups.com>
> > Sent: Wednesday, August 30, 2000 4:35 PM
> > Subject: [noparse][[/noparse]basicstamps] DC Motor control
> >
> >
> > > Hello,
> > >
> > > I just found basicstamps - absolute newbie.
> > >
> > > we are searching for a DC motor control to set the position of a
> > > linear screw drive.
> > > Has anybody done/tried this with BASIC Stamps ?
> > >
> > > Our screw so far is driven by a Maxon DC Motor RE35 90W (12V) and a
> > > HP HEDS 5540 Digital Encoder. A 0.52 volt output / 1000rpm DC tacho
> > > is available too.
> > >
> > > At least we want to control the bidirectional position not the speed.
> > > The periodic movement of the
> > > screw is a sinus over 0..50 cm. Motor needs average 200 rounds per
> > > second.
> > >
> > > We are connecting to a IBM compatible PC with RS232 and Visual Basic
> > > program running,
> > > so we need a speedy controller in between.
> > >
> > > Thank you
> > > Dirk
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
>
>
>
>
format I like.
Anyway, about the opto-interruptors described, what kind of positional
repeatability do you see most often in such designs?
Neglecting play and temp changes of the mechanical components of say a
machine slide, what kind of signal repeatability could be expected out of
it? (±.001"?, ±.005"?)
Would the output signal repeat within ±.001 for 100,000 consecutive slide
cycles?
Best Regards,
Mark
Original Message
From: G. Shearer <g.shearer@v...>
To: basicstamps@egroups.com <basicstamps@egroups.com>
Date: Sunday, September 10, 2000 9:42 AM
Subject: Re: [noparse][[/noparse]basicstamps] DC Motor control
>Well, I thought about it and think that your best course would be to use a
>stepper motor. The stepper motors cost $60 max each and it is easy for the
>stamp to control the stepper. Position is recognized by the number of steps
>and in which direction. There should also be a home position indicator ie.
>optointerruptor. You can get some ideas from my web site at:
>
>www.microcontrollertricks.cjb.net
>
>Let me know if you need any further help.
>
>Gary
>
>
Original Message
>From: "Dirk R. Kuhlmann" <kuhlmannd@i...>
>To: <basicstamps@egroups.com>
>Sent: Friday, September 01, 2000 1:29 AM
>Subject: Re: [noparse][[/noparse]basicstamps] DC Motor control
>
>
>> Thanks Gary,
>>
>> unfortunately I need 200 rounds to the end of my linear
>> ball-screw positioner and this 50cm long potentiometers are quite
>> expensive.
>>
>> As I am no elektronik engineer but an IS guy must a regulator be
>> realised for that or did you tried these third party products like Motor
>> Mind B ?
>>
>> So far I got, that the memory of a stamp is low limited and I ask myself,
>if
>> it's
>> possible (memory and speed) with this nice part.
>>
>> Do you know how to put an encoder electronic to the stamp.
>>
>> best regards
>>
>> Dirk
>>
>>
Original Message
>> From: "G. Shearer" <g.shearer@v...>
>> To: <basicstamps@egroups.com>
>> Sent: Friday, September 01, 2000 7:37 AM
>> Subject: Re: [noparse][[/noparse]basicstamps] DC Motor control
>>
>>
>> > Dirk,
>> >
>> > I am using such a device to control a waveguide attenuator. The
>attenuator
>> > has a slug that is pushed in and out of the waveguide with a linear
>> > ball-screw positioner which is driven by a 12 volt motor. On the end of
>> the
>> > shaft, I have a 10 turn potentiometer which is read by the control
>> computer.
>> > Cheaper than the encoder method and easier to program as well with a
>> stamp.
>> > We even do hysteresis to eliminate the backlash and play of the ball
>> screw.
>> > Will maximum travel be reached within 10 rotations of the screw? If you
>> need
>> > more rotations, then the encoder method would be the only way. If you
>want
>> > more info or ideas, please email back.
>> >
>> > Good luck,
>> > Gary
>> >
>> > g.shearer@v...
>> > Free Electron Laser Research Center
>> > Vanderbilt University
>> > Nashville, Tennessee
>> >
>> >
Original Message
>> > From: "Dirk Robert Kuhlmann" <kuhlmannd@i...>
>> > To: <basicstamps@egroups.com>
>> > Sent: Wednesday, August 30, 2000 4:35 PM
>> > Subject: [noparse][[/noparse]basicstamps] DC Motor control
>> >
>> >
>> > > Hello,
>> > >
>> > > I just found basicstamps - absolute newbie.
>> > >
>> > > we are searching for a DC motor control to set the position of a
>> > > linear screw drive.
>> > > Has anybody done/tried this with BASIC Stamps ?
>> > >
>> > > Our screw so far is driven by a Maxon DC Motor RE35 90W (12V) and a
>> > > HP HEDS 5540 Digital Encoder. A 0.52 volt output / 1000rpm DC tacho
>> > > is available too.
>> > >
>> > > At least we want to control the bidirectional position not the speed.
>> > > The periodic movement of the
>> > > screw is a sinus over 0..50 cm. Motor needs average 200 rounds per
>> > > second.
>> > >
>> > > We are connecting to a IBM compatible PC with RS232 and Visual Basic
>> > > program running,
>> > > so we need a speedy controller in between.
>> > >
>> > > Thank you
>> > > Dirk
>> > >
>> > >
>> > >
>> > >
>> > >
>> >
>> >
>> >
>> >
>>
>>
>>
>>
>
>
>
>
>
>Anyway, about the opto-interruptors described, what kind of positional
>repeatability do you see most often in such designs?
Under operating conditions, a stepper will hit the same mark every time,
all the time (ie. unless it stalls, skips or breaks).
>
>Neglecting play and temp changes of the mechanical components of say a
>machine slide, what kind of signal repeatability could be expected out of
>it? (±.001"?, ±.005"?)
This would depend on the steps/revolution of your stepper and the reduction
on your linear (lead screw?) drive system. Certainly stepper based systems
are capable of extremely accurate micro positioning. 200 steps/revolution
bipolar stepper motors are common and cheap- with that figure and knowing
the pitch of your leadscrew you can figure out how accurate your setup
would be. ie. assuming a pitch of 10 tpi (threads per inch) on your lead
screw a 200 step/revolution motor would give you increments of 0.0005"-
half a thou. This of course, is an ideal mechanical system without any
backlash or runout.
Best, Duncan
direction. This process is called hysterisis. You go past the desired
position in one direction then return to it going the other. This will take
out almost all of the positioning error. Secondly, you could use a
microstepping driver which could give you a resolution of over 10,000 steps
per revolution. The position indicator is just a home reference position.
When in doubt, return to home and then go to the desired position. I have
been able to do positioning with a stepper and micrometer drive (0.5mm per
rev) with an accuracy of less than 10 microns. Remember, with a stepper
motor, you get perfect positioning every 4 steps as the error evens itself
out.
Gary
Original Message
From: <orthner@s...>
To: <basicstamps@egroups.com>
Sent: Sunday, September 10, 2000 4:14 PM
Subject: Re: [noparse][[/noparse]basicstamps] DC Motor control
At 11:38 AM 9/10/00 -0700, you wrote:
>Anyway, about the opto-interruptors described, what kind of positional
>repeatability do you see most often in such designs?
Under operating conditions, a stepper will hit the same mark every time,
all the time (ie. unless it stalls, skips or breaks).
>
>Neglecting play and temp changes of the mechanical components of say a
>machine slide, what kind of signal repeatability could be expected out of
>it? (±.001"?, ±.005"?)
This would depend on the steps/revolution of your stepper and the reduction
on your linear (lead screw?) drive system. Certainly stepper based systems
are capable of extremely accurate micro positioning. 200 steps/revolution
bipolar stepper motors are common and cheap- with that figure and knowing
the pitch of your leadscrew you can figure out how accurate your setup
would be. ie. assuming a pitch of 10 tpi (threads per inch) on your lead
screw a 200 step/revolution motor would give you increments of 0.0005"-
half a thou. This of course, is an ideal mechanical system without any
backlash or runout.
Best, Duncan
(<1amp @ 28v) DC motors. The position feedback comes from a
potentiometer attached to the gear train of each motor. I want to
store up to 100 positions for each motor and then recall the desired
position to move each motor to. Can anyone suggest the best approach
for doing this? What hardware would you recommend etc.
Many thanks
Hal
to 1/2HP with a variable rpm control of 0-5000rpm. I'll probably need a
power supply and controller for such a motor.
If I can use a Stamp to use as a controller, it would be good too.
Am I asking for something that doesn't exist?
Thanks,
Paul Ko
pko@m...
>This might be off the subject, but I'm looking for a DC motor at about 1/3
>to 1/2HP with a variable rpm control of 0-5000rpm. I'll probably need a
>power supply and controller for such a motor.
>If I can use a Stamp to use as a controller, it would be good too.
>Am I asking for something that doesn't exist?
>
>Thanks,
>Paul Ko
>pko@m...
>
>Hi Paul -
I just ran across a 1/3 HP 90 VDC motor on sale. Here is the web link:
http://www.meci.com/
Right on the front page.
Hope that helps.
Regards,
Bruce Bates
>This might be off the subject, but I'm looking for a DC motor at about 1/3
>to 1/2HP with a variable rpm control of 0-5000rpm. I'll probably need a
>power supply and controller for such a motor.
>If I can use a Stamp to use as a controller, it would be good too.
>Am I asking for something that doesn't exist?
>
>Thanks,
>Paul Ko
Paul,
These ideas are great, but be prepared to spend some $$$.
To zero in on a good motor voltage should be included as
part of your requirements although some motors have a RPMs
per volt or maybe a torque per amp rating and work quite well
in certain applications. A lot of DC motors in the .3 to
1.0 HP range seem to be made for about 90 volts. Check
Dayton motors and speed controllers from Grainger. Harbor
freight and Grizzly mini lathes and mills have replacement
permanent magnet DC 7000rpm motors for about $129. The mini
lathes and mills are belted or geared down to 3/4 to 4/5 HP
at 2900rpm. Without this gearing you'll probably be in the
right HP/Speed range as you requested. Finally, check Ebay
for DC motors. You might be surprised what you'll find.
Last, check out BattleBots.com and follow the links related
to building your own bot. Some of the teams are quite free
about the components and motors of their bots. National Power
Chair has DC motors from 12, 24, and 36 volts from fractional
HP to 15 HP!!
As far as the stamp controlling your motor, remember that
depends on wether your output needs continuous PWM output
or not. IF so, use the stamp with a PWM gate driver to a
few high current/voltage FETS in parallel for single direction
control or make your own H-Bridge from FETS for forward and
reverse control. Check out www.irf.com for gate drivers and
FETS. Check out this web site http://members.tripod.com/~divelec/
for low cost ($40) high current DC motor controllers.
Good luck!!
Greg Hensley
Lawrence Livermore National Laboratory
Defense Sciences Engineering Division
7000 East Avenue Mail Stop L-369
Livermore, CA 94550
Phone: (925) 423-4850
Fax: (925) 422-2118
Email: hensley1@l...
gear motors, some belts, two wheels, a screw-jack motor and a controller.
Original Message
> >This might be off the subject, but I'm looking for a DC motor at about
1/3
> >to 1/2HP with a variable rpm control of 0-5000rpm. I'll probably need a
> >power supply and controller for such a motor.
> These ideas are great, but be prepared to spend some $$$.
> To zero in on a good motor voltage should be included as
> part of your requirements although some motors have a RPMs
> per volt or maybe a torque per amp rating and work quite well
> in certain applications. A lot of DC motors in the .3 to
> 1.0 HP range seem to be made for about 90 volts. Check
> Dayton motors and speed controllers from Grainger. Harbor
> freight and Grizzly mini lathes and mills have replacement
> permanent magnet DC 7000rpm motors for about $129. The mini
> lathes and mills are belted or geared down to 3/4 to 4/5 HP
> at 2900rpm. Without this gearing you'll probably be in the
> right HP/Speed range as you requested. Finally, check Ebay
> for DC motors. You might be surprised what you'll find.
> Last, check out BattleBots.com and follow the links related
> to building your own bot. Some of the teams are quite free
> about the components and motors of their bots. National Power
> Chair has DC motors from 12, 24, and 36 volts from fractional
> HP to 15 HP!!
>
> As far as the stamp controlling your motor, remember that
> depends on wether your output needs continuous PWM output
> or not. IF so, use the stamp with a PWM gate driver to a
> few high current/voltage FETS in parallel for single direction
> control or make your own H-Bridge from FETS for forward and
> reverse control. Check out www.irf.com for gate drivers and
> FETS. Check out this web site http://members.tripod.com/~divelec/
> for low cost ($40) high current DC motor controllers.
I am in the process of using a stamp to sontrol 4 DC
motors. I wish to have speed control and direction of
rotation control. I need a chip that shall relieve the
stamp of doing the speed control itself. The stamp
just needs to send a command to the ship for amount of
speed and direction and the chip should further drive
the motors. Is there such a soln / chip available .
Any help shall be appreciated.
Thanks a lot
__________________________________________________
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wrote:
> Hi
>
> I am in the process of using a stamp to sontrol 4 DC
> motors. I wish to have speed control and direction of
> rotation control. I need a chip that shall relieve the
> stamp of doing the speed control itself. The stamp
> just needs to send a command to the ship for amount of
> speed and direction and the chip should further drive
> the motors. Is there such a soln / chip available .
> Any help shall be appreciated.
>
> Thanks a lot
Hi
On day I salvage 2 LB1630 fron a robot toy.
Low-Saturation Bidirectional Motor Driver
for Low-Voltage Applications
LB1630 is a 8 pins IC build by Sanyo
With two signals you obtain forward reverse and stop .For the speed,
(PWM) it will be necessary to construct your own circuit.
Excuse my English.
Alain Gauthier
I have a suggestion. Check out www.barello.net. This
guy makes several small PIC based control systems. One
device he sells for $30.00 called the RC4PWM board
which takes four R/C servo signals and drives four DC
motors. It will handel up to 30 volts and 1.1 amp per
motor. It controls both direction and speed of the
motor based on an input pulse that varies from 1 to 2
mS with 1.5 mS being neutral/braking. The stamp should
be able to output these signals and run the motors. If
you need more current or voltage then things get a lot
more complex.
Regards,
DrDiode
--- harshit suri <suri_list@y...> wrote:
> Hi
>
> I am in the process of using a stamp to sontrol 4 DC
> motors. I wish to have speed control and direction
> of
> rotation control. I need a chip that shall relieve
> the
> stamp of doing the speed control itself. The stamp
> just needs to send a command to the ship for amount
> of
> speed and direction and the chip should further
> drive
> the motors. Is there such a soln / chip available .
> Any help shall be appreciated.
>
> Thanks a lot
>
>
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I just bought a few L293D Motor Controllers (16 pin DIP) from
www.HVWTech.com. I am looking at the datasheet and I was wondering
if anyone has used this chip with the BSII? I want to control two
beeper dc motors on a small robot. Any help would be great.
Thanks,
Curtis