Subject:
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Re: multi-device output controller
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 25 Mar 1999 19:43:33 GMT
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Original-From:
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Joel Shafer <joel@connectSPAMLESS.net>
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Viewed:
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2680 times
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What about a real time circuit that routed the output power to one of eight
output ports depending on the PWM. That way it only takes one output port
on the RCX and up to three (out of 24) motors could be running at the same
time.
At 05:52 PM 3/25/99 +0000, you wrote:
> I've been considering various ways to control more than three output devices
> with only the three ports and came up with the following idea. I don't have
> the
> electrical design knowledge to implement, so if this idea sounds good, I'd • like
> to collaborate with someone to try it.
>
> My thought: Since the RCX uses PWM to control the motors, it is basically
> sending out 8 different digital signals. A single device could be designed to
> recognize these signals by counting the PWM for a fixed amount of time and
> route
> power to 1 of 8 ports.
>
> The device would be connected to 2 RCX output ports, one for the device
> selection and another to supply power to the device. This would leave 1 free
> RCX port. This design only allows 2 devices to be powered at a time, but
> allows
> for a total of 9 devices.
>
> My thoughts on physical size are a block that is 4x16 with two connecting
> cables (device select and device power) The block would be a matrix of 8
> device
> ports:
>
> +---+---+---+---+
> device------|o o|o o|o o|o o|
> select |o o|o o|o o|o o|
> +---+---+---+---+
> device------|o o|o o|o o|o o|
> power |o o|o o|o o|o o|
> +---+---+---+---+
> (top view )
>
> Does this make sense to anyone else? Anyone interested? Anyone know how to
> design the circuit to count PWM & select output device?
>
> -Wes
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
Joel Shafer joel@connect.net
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | Re: multi-device output controller
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| (...) And where are you getting motor drive power from? I assume you want the selected motor to run at full power, not at 1/8, 1/4, etc. I'm afraid you're still stuck consuming the extra output for power unless you use a separate power source. (28 years ago, 26-Mar-99, to lugnet.robotics)
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Message is in Reply To:
| | multi-device output controller
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| I've been considering various ways to control more than three output devices with only the three ports and came up with the following idea. I don't have the electrical design knowledge to implement, so if this idea sounds good, I'd like to (...) (28 years ago, 25-Mar-99, to lugnet.robotics)
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