Subject:
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Re: Motor output signals.
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 1 Mar 2000 17:07:46 GMT
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Original-From:
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Marco C. <MARCO@avoidspamSOPORCEL.PT>
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Viewed:
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2406 times
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Thxs John :) ! This's a great help.
One of the first things I thought up, was a Motor clicking on a Touch
Sensor type of connection :> er... a *mechanical* serial interface, a bit
like the motor->generator thing. Then came the electrical type idea (and
then the opto-thing, like Bert van Dam's idea).
At 11:54 01-03-2000 +0000, John Barnes wrote:
> Each RCX motor output is very straight forward.
>
> Each motor channel has a two output circuits, one for each side of
> the motor. These outputs can be set to be either 0 volts, 8 volts
> or floating, ie; not connected, under firmware control.
>
> When the motor is "Off", both outputs are grounded, shunting the
> motor and creating the dynamic braking effect.
>
> When going forwards or in reverse, one output is grounded, the
> other is powered to 8 volts.
>
> When in "Float" both outputs are off and motor can freewheel.
>
> When the power setting is not "full", the outputs are pulsed
> between powered (either forward or reverse) and the float state.
>
> The overall period is 8 milliseconds, divided up into 1 millisecond
> intervals. The power setting value you select controls how many
> milliseconds out of the total of 8 the motor is powered for, ie;
> 1 - 8 (where 8 is full power on all the time).
>
> I hope this explains how the outputs work. If you have any futher
> questions, please feel free to ask. I have studied the RCX in
> some detail.
>
> I have used the pulsed output to control all sorts of external
> devices, but I think the 1 millisecond timing is a little too
> fast to catch with the cybermaster sensor input routines. You may have
> to implement your own serial communication protocol to transfer
> information over such a connection. I would be surprised if you
> could get better than a few tens of bits per second. You could
> try a motor on the output of the RCX driving a motor as a generator
> on the input of the cybermaster. At least that way you avoid your
> fear of a direct connection! And you could watch the serial data
> going bit by bit from one device to the other! Just remember that
> the motor generator will only convey data in one sense (when it is
> connected to generate a positive input.) Negative inputs will read
> as raw zero.
>
> JB
____________________
Marco C. aka McViper
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Message is in Reply To:
 | | Motor output signals.
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| Each RCX motor output is very straight forward. Each motor channel has a two output circuits, one for each side of the motor. These outputs can be set to be either 0 volts, 8 volts or floating, ie; not connected, under firmware control. When the (...) (27 years ago, 1-Mar-00, to lugnet.robotics)
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