Subject:
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Re: multi-device output controller (fwd)
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 26 Mar 1999 18:08:07 GMT
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Viewed:
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976 times
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In lugnet.robotics, lego-robotics@crynwr.com (Jim Choate) writes:
> ----- Forwarded message from Dennis Clark -----
>
> From: "Dennis Clark" <dlc@verinet.com>
> Subject: Re: multi-device output controller (fwd)
> Date: Fri, 26 Mar 1999 15:27:53 GMT
>
> Ha! I'm one up on ya both. Run a tight loop and find out how fast the
> RCX can cycle the motors on and off, time it, and send a package a serial • [snip]
> What's the clock speed for the RCX and how many cycles does a read, write,
> read take? I've only had mine 3 weeks, normaly I use a 8031 for my
> robot and Lego stuff.
Dunno, I haven't looked yet, I just came up with the idea.
> Why did you capitalize BAUD? It's not an acronym. The baud rate is the PRR
> while the actual bit rate is 8 times that if we're going to take each
Because I felt like it? I've seen it written both ways.
[snip]
> And your numbers are off:
>
> 4 motors 2 bits
>
> for/rev/stop 2 bits
Nope. 0 (speed) means off, no matter what direction you are going,
therefore:
0= forward, 1=Reverse. 1 bit
> 8 speeds 3 bits
> The beauty of the mechanism I described previously is that you can use the
> 64 addresses for anything, not just controlling motors. You could bank
> switch the inputs, control other hardware, etc.
>
> What I had in mind was to take two outputs and integrate the signal with the
> PRR (Pulse Repetition Rate) since it's fixed. Then the output of the
> integrator is linked to a S&H (Sample & Hold) so that it can be A/D'ed. This
> provides a dual channel parallel digital address buss. Do the same thing on
> the 3rd output only use it as the data buss. Then any device that wants to
> sit on the buss would have 2 8-bit addresses and a 8-bit data port. This
> could be extended by using the inputs on the RCX as a mechanism to read the
> data for each of those addresses as well.
Sounds complicated, but elegant. My idea, just uses a different medium
for communication.
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Message is in Reply To:
 | | Re: multi-device output controller (fwd)
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| ----- Forwarded message from Dennis Clark ----- From: "Dennis Clark" <dlc@verinet.com> Subject: Re: multi-device output controller (fwd) Date: Fri, 26 Mar 1999 15:27:53 GMT Ha! I'm one up on ya both. Run a tight loop and find out how fast the RCX (...) (25 years ago, 26-Mar-99, to lugnet.robotics)
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