Subject:
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Project WIRRL Update
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 21 Oct 2002 04:38:13 GMT
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Original-From:
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Rob Limbaugh <RLIMBAUGH@GREENFIELDGROUP.COMspamless>
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Viewed:
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878 times
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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 has 2 Replies:
 | | Re: Project WIRRL Update
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| I'm looking for an RF solution for PC-RCX communication as well, been thinking along very much the same lines as Rob seems to have so far, I too was pondering how to deal with TX/RX switching (though I've not got as far as building a circuit, and (...) (22 years ago, 21-Oct-02, to lugnet.robotics)
| | | Another update for WIRRL
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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 (...) (22 years ago, 22-Oct-02, to lugnet.robotics)
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