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Posted by Padu on April 20, 2006, 2:33 am
Having gained a little bit of experience with electronics, I must say that
making things work may be frustrating sometimes. Not this time.
I just got my Roboteq AX3500 (the open board version). It has 2 60A channels
for DC motors, 8 pwm outputs, several types of inputs (analog, rs232, RC RF
receiver) and accepts either optical encoders or pots for closed loop
control.
I haven't fully tested it yet, but in less than 15 minutes, I've connected
power to the controller (using a car battery), connected my magmotor DC
motor to it, and the serial cable to my computer; installed their
application and using a USB joystick there I was turning my motor back and
forth just like a kid playing with a new toy.
The PC app that comes with it is very complete, nice and easy to use. The
controller parameters are very complete, for example, in open loop mode (I
think the same goes for closed loop), you can setup if you want regular
input, exponential or log input. When you are playing with the joystick, you
can monitor voltage, encoder, amps, everything on nice real time charts. The
documentation is very complete and full of illustrations.
So far I'm very happy with my purchase, I'll let you guys know when I
implement it into Yaboo (the name of my second robot).
Cheers
Padu
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Posted by on April 21, 2006, 3:55 pm
Looks like a neat combination circuit board. But at $395 its a bit
pricey for my applications. So tell us about the features besides dual
Hbridge that make it particularly special to you .
Padu wrote:
> Having gained a little bit of experience with electronics, I must say that
> making things work may be frustrating sometimes. Not this time.
> I just got my Roboteq AX3500 (the open board version). It has 2 60A channels
> for DC motors, 8 pwm outputs, several types of inputs (analog, rs232, RC RF
> receiver) and accepts either optical encoders or pots for closed loop
> control.
> I haven't fully tested it yet, but in less than 15 minutes, I've connected
> power to the controller (using a car battery), connected my magmotor DC
> motor to it, and the serial cable to my computer; installed their
> application and using a USB joystick there I was turning my motor back and
> forth just like a kid playing with a new toy.
> The PC app that comes with it is very complete, nice and easy to use. The
> controller parameters are very complete, for example, in open loop mode (I
> think the same goes for closed loop), you can setup if you want regular
> input, exponential or log input. When you are playing with the joystick, you
> can monitor voltage, encoder, amps, everything on nice real time charts. The
> documentation is very complete and full of illustrations.
> So far I'm very happy with my purchase, I'll let you guys know when I
> implement it into Yaboo (the name of my second robot).
>
>
> Cheers
>
> Padu
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Posted by Padu on April 21, 2006, 5:25 pm
> Looks like a neat combination circuit board. But at $395 its a bit
> pricey for my applications. So tell us about the features besides dual
> Hbridge that make it particularly special to you .
The capability of pwm generation for up to 8 servos will save me a lot of
work, since I have a couple of RC servos to control. For my smaller project,
I've designed a board with a PIC to control 4 RC servos, and although that
may seem simple in concept, in practice it gave me a few (a lot!) of
headaches.
Besides being an HBridge, it is also a PID controller (obviously you can set
up each one of the PID constants), and you can configure each one of the two
channels as open loop or closed loop speed controller or position
controller. You can use either an optical encoder or a potentiometer.
Another thing that I found very nice is the possibility of input using an
R/C receiver. This way I can easily control my gasoline ATV using the same
remote control I use to control my R/C car.
Cheers
Padu
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> making things work may be frustrating sometimes. Not this time.
> I just got my Roboteq AX3500 (the open board version). It has 2 60A channels
> for DC motors, 8 pwm outputs, several types of inputs (analog, rs232, RC RF
> receiver) and accepts either optical encoders or pots for closed loop
> control.
> I haven't fully tested it yet, but in less than 15 minutes, I've connected
> power to the controller (using a car battery), connected my magmotor DC
> motor to it, and the serial cable to my computer; installed their
> application and using a USB joystick there I was turning my motor back and
> forth just like a kid playing with a new toy.
> The PC app that comes with it is very complete, nice and easy to use. The
> controller parameters are very complete, for example, in open loop mode (I
> think the same goes for closed loop), you can setup if you want regular
> input, exponential or log input. When you are playing with the joystick, you
> can monitor voltage, encoder, amps, everything on nice real time charts. The
> documentation is very complete and full of illustrations.
> So far I'm very happy with my purchase, I'll let you guys know when I
> implement it into Yaboo (the name of my second robot).
>
>
> Cheers
>
> Padu