I have been experimenting a little with these. (Not enough
to be too useful though.) They generate their own preamble
and checksum and have the ability to do automatic
acknowledge. Boards are also available with external
antennas for extended range.

Allen

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-
> bounces@mit.edu] On Behalf Of A. Sergio Sena
> Sent: Monday, August 26, 2013 5:33 PM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Low speed RF
>=20
> The simplicity may not compare, but you can get very cheap
> RF 2.4G modules,
> easy to use, that still require external MCU, for less
than
> $1.50 ready to
> use.
> Handfull o libraries written and open source on the
internet.
>=20
> As an example (there are hundreds more):
> http://www.ebay.com/itm/Arduino-NRF24L01-2-4GHz-
> Antenna-Wireless-Transceiver-Module-For-Microcontroll-
> /310670158878?pt=3DLH_DefaultDomain_0&hash=3Ditem485562
> 6c1e
>=20
> ,
> Sergio Sena
>=20
>=20
>=20
>=20
>=20
> On 26 August 2013 22:05, Bob Blick <bobblick@ftml.net>
> wrote:
>=20
> > Roman Black has the exact webpage for cheap RF as you
> describe:
> >
> > http://www.romanblack.com/RF/cheapRFmodules.htm
> >
> > I've used those modules, they work pretty well and the
> price can't be
> > beat. Roman's software approach is also quite adequate.
> >
> > Cheers, Bob
> >
> > On Mon, Aug 26, 2013, at 01:29 PM, Phil Keller wrote:
> > > I am looking for an RF solution for use around the
home.
> I have a home
> > > brewed (PIC based) weather station that is connected
> via wires to an
> > > anemometer, wind direction vane, thermometer and
> rain gauge. I would
> > > like to transmit the weather information to another
part
> of the house.
> > >
> > > The system needs would be the following.
> > > - Low data rate (~20 bytes of data plus header and CRC
> about every 4-5
> > > seconds)
> > > - Uni-directional data traffic.  If the CRC fails,
dump the
> data and
> > > wait for the next message.
> > > - Short range (~100 feet through a couple of walls)
> > > - Low Power receiver (It would be nice if I could make
it
> battery
> > > powered)
> > > - Low cost (Since it is only one this may not be
possible)
> > >
> > >    Suggestions/advice are appreciated.
> >
> > --
> > http://www.fastmail.fm - The way an email service should
> be
> >
> > --
> > http://www.piclist.com/techref/piclist PIC/SX FAQ & list
> archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
> >
>=20
>=20
>=20
> --
>=20
>=20
> A. S=E9rgio Sena
>=20
>=20
> www.antoniosergiosena.com
> Twitter - http://www.twitter.com/_SergioSena
> LinkedIn - http://pt.linkedin.com/in/assena
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list
> archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist



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