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'[EE]: RS232 Communication via RF link'
2002\02\05@102715 by lvddoelen

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Dear electronicers,

The recent "low power rf application" thread got me exited about building my own rf link between my computer and my PIC controlled robot. Unfortunatly the thread got useless after about 2 reactions, so I still didn't get the answers I was hoping for.

I'm trying to build a bi-directional, wireless link with my pic (16F84) robot. I found several commercial TX/RX modules that only go 1-way, but I would like (if possible) to build my own TX/RX modules that will give me 2-way communication capabilities. My main reason for this is a limited budget.

The above project leaves me the following questions:
* Can anybody help me to a 2-way TX/RX schematic that will allow me to send/receive bytes to/from my PIC?
* What kind of trouble am I getting myself into by trying to build the rf modules myself? Is saving a few bucks worth the hassel?

Thanks for any response you'r willing to give me.

Lars

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2002\02\05@110131 by M. Adam Davis

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A lot of people on this list shy away from radio (and many from analog
in general) electronics due to the high level of effort and knowledge,
and the relatively cheap modules that take care of this for us.  It's
not that it's a black magic that no one knows, it's just easier, faster,
and in many cases cheaper not to deal with it.

I'd suggest you either
1) get a pre-made transceiver from some source
2) hack some FRS, or walkie talkie, or cordless phone to do what you
want.  A cordless phone, for instance, provides full duplex
communication for (often) less than $20.  the only thing you need to do
then is look into the interface, since you can't reliably send digital
over them.  Some sort of FSK modulation is needed, which can be sent
from the PIC.  You'd then just need a detector on the receiving end to
receive the modulation and translate back to digital.

If, however, you really want to get into it yourself, then get the ARRL
handbook, and look around the net for HAM web sites.  You'll likely find
other lists that are more tuned into radio discussions than this list.

-Adam

Lars v.d. Doelen wrote:

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2002\02\05@110510 by denis

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Hi,

go to see this site WEB,

http://www.radiotronix.com    Is the full duplex module communication

Regard

Denis


{Original Message removed}

2002\02\05@112213 by Tim McDonough

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From: "Lars v.d. Doelen" <.....lvddoelenKILLspamspam.....starren.nl>

>I'm trying to build a bi-directional, wireless link with my
pic(16F84) robot. I found several commercial TX/RX modules that only
go 1-way, but I would like (if possible) to build my own TX/RX modules
that will give me 2-way communication capabilities. My main reason for
this is a limited budget.



I don't have information on building your own but a product that I
maintain uses Tx/Rx modules from Abacom that seem to work well.
http://www.abacom-tech.com

Tim

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2002\02\08@091125 by Al Williams

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[[Again, for some reason this went direct to the poster, so I'm sending
it to the list... Sorry!]]

Not quite what you are looking for, but our "Basic Stamp Project of the
Month" this month is relevant. The system I show is slow and one way,
but it is cheap and readily available. A PIC could drive it much faster
(much of the slow speed is to allow for the Stamp's processing latency)
although it would never be high speed. In theory, you could adapt the
system for two way, although I haven't personally done this.

Anyway, might spur some ideas. The project of the month changes each
month and is always at: http://www.al-williams.com/awce/som.htm

We call it the Basic Stamp Project of the Month, but we occasionally do
PIC, SX, or just general-interest projects.

Good Luck!

Al Williams
AWC
* Check out our PIC Programming Tutorial
http://www.al-williams.com/pictutor




> {Original Message removed}

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