Re: [bascom] RC5/1wire on RF
Bluetooth supposedly will bring the price per node in the $5 region (for
transceiver alone) enabling your smart building applications . This hasn't
happened yet. Real products now:
-RF Monolithics -their second generation transceivers -cost $10-15/each , up
to 115kbps , complete transceiver- only a few caps and resistors
required -no inductors or crystals. They're available in several popular
license free bands like 318MHz, 433MHz , 868MHz , 916MHz.
-Texas instruments RF4900 and 6900(A) - complete transmitter and
transceiver - sell for approx $2.50 and $6 ea .Require a few external parts
including some inductors, at least a crystal, some filters. This is a DDS
and pll/vco based transmitter and superhet receiver on one chip.
-The Micrel part and some RF Micro devices parts are about the same and
require about the same types and number of external parts including crystals
and inductors. They're just PLL based but no DDS and modulation can be a
problem .
With the exception of the RF Monolithics , all these chips require solid RF
design equipment and experience.
Matt Tudor, MSEE
Elmar Technologies
http://personal.lig.bellsouth.net/~mariusrf
-----Original Message-----
From: G Pistorius <gpistorius@icon.co.za>
To: Bascom <bascom@grote.net>
Date: Tuesday, December 12, 2000 5:32 PM
Subject: [bascom] RC5/1wire on RF
It is quiet interesting that a lot of Bascom users seems to be experimenting
in the same area.
I am interested in using the Telecontrolli/Micrel Rf devices with something
like RC5 with the option of IR.
The part I am looking for is RC5 TX as it makes a lot sense in a
transceiver application to use Avr rather than adding another chip as a RC 5
transmitter. ?
Also 1wire together with the Dallas range of applications, but as an RF
application or even IR seems to be another option? I have seen some RF
dallas products which can be very useful in home automation applications but
it was quiet expensive.
An Rf protocol for smart home applications would be the main objective of
which SNAP can be an option.
The Ethernet application is another area which can be used, although wired
and the main concern with this is the to be cost effective, one needs to
look at a peer to peer setup with terminators rather than an application
with hubs. ISA/PCI type Ethernet cards for pcs are cheap (and if one can
interface the IDE bus to the Atmel chips), ISA interfaces to standard
Ethernet cards can be a very cost effective way of integrating smart
building concepts.
Other areas are the Java type interfacing to micro controllers.
Any other ideas on this subject ?
Thanks
Georg Pistorius
South Africa