Subject:
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Re: Add motor driver to RCX
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Sun, 1 Aug 2004 22:13:40 GMT
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Viewed:
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3919 times
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In lugnet.robotics.rcx, Morten Høgholm Pedersen wrote:
> > can't see any other way of using a bidirectional 300mA PWM
> > signal to control a more powerful H-bridge.
>
> Good idea. It will be difficult, though, to determine the differnce between
> braked and floating motor setting, or am I wrong? Or maybe one should measure
> the resistance on the RCX terminal, when no voltage is put out.
Yes, I suggest making an inertia circuit for use with trains, but for cars
something else might be better. In RCX float or braked modes the power H-bridge
flywheel diodes will brake the motor, but in high power applications, how often
is float mode used?
When driving an RC car, people like to allow it to stop itself, rather than
reversing the motor to brake quicker, in order to save battery power. The
braking of the flywheel diodes will be useful there.
In the train application I intend to smooth the output with a large capacitor or
series choke in order to present the train motors with smoother power.
> I thought of invading the RCX and pull out the logic signals, and connect then
> to another motor driver - but I need to get a cheap defect RCX to test with.
>
> Morten
I think delving inside the RCX is a lot more work with a lot more risk. The
idea is to protect the expensive bits and just cut the wires in order to connect
the RCX output to a piece of veroboard.
Mark
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Message is in Reply To:
 | | Re: Add motor driver to RCX
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| (...) Good idea. It will be difficult, though, to determine the differnce between braked and floating motor setting, or am I wrong? Or maybe one should measure the resistance on the RCX terminal, when no voltage is put out. I thought of invading the (...) (20 years ago, 1-Aug-04, to lugnet.robotics.rcx)
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