Subject:
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Another update for WIRRL
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 22 Oct 2002 06:45:06 GMT
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Original-From:
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Rob Limbaugh <rlimbaugh@=spamcake=greenfieldgroup.com>
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Viewed:
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2743 times
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To those interested,
I've made a new schematic (WIRRL Rev. 2a) using a better TX/RX pair (Linx LC
Series) and I think I've found a possible better solution for handling flow
of data. This new diagram eliminates three transistors and replaces the
4001 Quad-NOR with a 74HC00A Quad-NAND.
Out of nowhere, it dawned on me that I should use a truth table to figure
out how to move the data. I've included the truth table information and
logic diagram at the bottom of the page.
Same link as before: http://www.abs-robotics.com/projects/wirrl.htm
Maybe I'll have time this weekend to actually build it...
- Rob
PS - Just as before, I don't claim this circuit works... I haven't built it,
so I don't know. I'm still learning.
----- Original Message -----
From: "Rob Limbaugh" <rlimbaugh@greenfieldgroup.com>
To: <lego-robotics@crynwr.com>
Sent: Monday, October 21, 2002 12:38 AM
Subject: Project WIRRL Update
> Hello everyone,
>
> WIRRL stands for "Wireless Infra-Red Radio Link".
>
> Creating each leg of the RF link independantly isn't really a problem • (once
> you have a reliable 38kHz IR carrier wave). The problem is eliminating • link
> feedback by controlling the direction of the conversation.
>
> Because it had been a couple months since I was last able to play with
> things, I decided I should probably document where I am now. (Spending
> yesterday going back over my notes was sort of a drag...) Then, I had • this
> radical idea of sharing things (what a concept!?).
>
> [The real story: I couldn't find everything. The stuff I did find was • out
> of order or in multiple places. I couldn't read some of my own notes, and • I
> had to rebuild some things so I could remember what they did!]
>
> So, for those interested:
> http://www.abs-robotics.com/projects/wirrl.htm
>
> Be warned... the current schematic probably won't work if you build it
> (matter of fact, I'm willing to bet it won't). The diagram looks like • it's
> made from different resources... that's because it is.
>
> Today I was working with a possible half duplex communication switching
> solution, which is set to be controlled by a 4001 NOR gate. A 200us delay
> is set for both sides of traffic. So, when the RX side is re-transmitting
> IR data, the 4001 is supposed to turn off the data line for the IR decoder
> (which feeds the RF TX) and hold it off 200us after the line goes low so
> feedback doesn't occur. This is where I'm currently stuck. Sadly, I'm • not
> an electronics guru, so it will take me some time to figure things out.
>
> Any guidance would be welcomed!
>
> - Rob
>
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Message is in Reply To:
 | | Project WIRRL Update
|
| Hello everyone, WIRRL stands for "Wireless Infra-Red Radio Link". Creating each leg of the RF link independantly isn't really a problem (once you have a reliable 38kHz IR carrier wave). The problem is eliminating link feedback by controlling the (...) (24 years ago, 21-Oct-02, to lugnet.robotics)
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