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DPRG: Linx RF Modules

Subject: DPRG: Linx RF Modules
From: Robert L. Jordan rljordan at airmail.net
Date: Thu Nov 11 07:16:48 CST 1999

David,

I'd love to see your demo! Thanks for offering.
Officers, Lets make time for this at the meeting, OK?
    Clay, Eric, Barry!

Robert Jordan
DPRG Sec 1999

David Philip Anderson wrote:

> Howdy
>
> Seems like momentum is building toward a group purchase of Linx Technologies
> RF modules, like those used on SR04 to implement the telemetry back
> channel.   I would be happy to demonstrate SR04's radio link at the next
> DPRG meeting, if there is interest in such.
>
> I purchased the "evaluation kit" a couple of years ago, for about $99.
> It included a pair of transmitters and a pair of receivers, all four on
> 418 MHz, and a couple of brief (<10 page) manuals.  This did not include
> (at that time) any evaluation board.
>
> They were pretty easy to get working, essentially just a straight RS-232
> connection on each end (HC6811/Max232 -> Tx -> Rx -> laptop COM port)
> with a resistive divider and diode on the transmitter end.
>
> The robot sends a continuous stream of 80 byte ascii characters at 2400
> baud.  This includes things like time stamp, battery voltage, sensor readings,
> odometry calculations, state variables, and so forth.  These are displayed
> on the receiving end or tee'd off to a file for later perusal.
>
> dpa

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