rf everywhere
On 7/3/2013 8:05 AM, RichD wrote:
Wireless is everywhere now, miniaturized to an astounding degree.
Recently, I saw a report on a button size gardening
gadget - stick it in the soil, it reports on moisture.
Bluetooth earphones, etc.
Who's designing these things? In my experience, RF
designers are a rare breed, and with the digital market
vastly larger, they're even rarer.
I'll guess, the IC have been perfected to the no-brainer
level. But still, you need need amps, filters, antenna, plus
issues of noise and layout, yes/no? That stuff isn't obsoleted.
I don't work in this area, but I'm curious, so can anyone
elaborate on what's going on, from a system viewpoint?
What are the chip functions, options, price, trade-offs?
In which situations would you reject them, to roll your own?
Is it simple on/off keying, or more sophisticated? Currently,
in communications theory, sensor networks are a hot topic,
where thousands of sensors are competing for bandwidth,
but for mundane consumer apps, I doubt those issues arise.
I'm looking to pick the brains of any gurus here -
--
Rich
You are right, but seems like someone has solved the RF problems once
for each of the useful bands, then its a piece of cake to interface with
sensors and one end and display/alarm at the other.
For an example, the tyre pressure monitor systems at 433 MHz. 10 gram
package, including battery, you screw on a tyre valve. Monitors tyre
pressure and temperature for about 1-2 years of operation. Reports real
time, every minute or so, to in-car readout.
--
Regards,
Adrian Jansen adrianjansen at internode dot on dot net
Note reply address is invalid, convert address above to machine form.
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